android decorview根布局 android布局控件

转载

mob6454cc641ffd 2023-07-25 21:04:50

文章标签 Android android Text 控件 文章分类 Android 移动开发

UI就是用户界面User Interface
什么是布局
——定义UI的可视化结构
——通过布局参数（LayoutParams）定义子元素的尺寸、位置
——布局是不可见的容器（ViewGroup）
LinearLayout布局的应用
RelativeLayout布局的应用
TextView控件
TextView从父类View派生而来
EditText控件
EditText控件是从TextView控件继承下来
Button控件的应用
Button空间是TextView控件的派生类，同时通过TextView继承了View的多种属性

package com.example.button;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    }

    //定义提供给按钮调用的一个方法
    public void BtnBmiCalc_Click(View v){
        //读取身高体重文本框的数值
        EditText editHeight = (EditText)findViewById(R.id.editHeight);//控件的id号，R.id作为前缀
        EditText editWeight = (EditText)findViewById(R.id.editWeight);
        TextView txtResult = (TextView)findViewById(R.id.txtResult);
        Double height = Double.parseDouble(editHeight.getText().toString());//将字符串转为浮点数
        Double weight = Double.parseDouble(editWeight.getText().toString());

        Double bmi = weight / (height*height);
        //setText就是输出响应文字
        if(bmi < 18.5){
            txtResult.setText("BMI:" + bmi.toString() + " 体型：过轻");
        }
        else if(bmi <= 23.9){
            txtResult.setText("BMI:" + bmi.toString() + " 体型：正常");
        }
        else if(bmi <= 27){
            txtResult.setText("BMI:" + bmi.toString() + " 体型：过重");
        }
        else if(bmi <= 32){
            txtResult.setText("BMI:" + bmi.toString() + " 体型：肥胖");
        }
        else{
            txtResult.setText("BMI:" + bmi.toString() + " 体型：非常肥胖");
        }

    }
}

法2

package com.example.button;
 
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
 
public class MainActivity extends AppCompatActivity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btnBmiCalc = (Button)findViewById(R.id.btnBmiCalc);
        btnBmiCalc.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //读取身高体重文本框的数值
                EditText editHeight = (EditText)findViewById(R.id.editHeight);//控件的id号，R.id作为前缀
                EditText editWeight = (EditText)findViewById(R.id.editWeight);
                TextView txtResult = (TextView)findViewById(R.id.txtResult);
                Double height = Double.parseDouble(editHeight.getText().toString());//将字符串转为浮点数
                Double weight = Double.parseDouble(editWeight.getText().toString());
 
                Double bmi = weight / (height*height);
                //setText就是输出响应文字
                if(bmi < 18.5){
                    txtResult.setText("BMI:" + bmi.toString() + " 体型：过轻");
                }
                else if(bmi <= 23.9){
                    txtResult.setText("BMI:" + bmi.toString() + " 体型：正常");
                }
                else if(bmi <= 27){
                    txtResult.setText("BMI:" + bmi.toString() + " 体型：过重");
                }
                else if(bmi <= 32){
                    txtResult.setText("BMI:" + bmi.toString() + " 体型：肥胖");
                }
                else{
                    txtResult.setText("BMI:" + bmi.toString() + " 体型：非常肥胖");
                }
            }
        });
    }
 
}

RadioButton控件的应用
RadioButton的继承关系图
wrap content 是根据内容的高度自动适配

package com.example.button;
 
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.TextView;
 
public class MainActivity extends AppCompatActivity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btnBmiCalc = (Button)findViewById(R.id.btnBmiCalc);
        btnBmiCalc.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //读取身高体重文本框的数值
                EditText editHeight = (EditText)findViewById(R.id.editHeight);//控件的id号，R.id作为前缀
                EditText editWeight = (EditText)findViewById(R.id.editWeight);
                TextView txtResult = (TextView)findViewById(R.id.txtResult);
                Double height = Double.parseDouble(editHeight.getText().toString());//将字符串转为浮点数
                Double weight = Double.parseDouble(editWeight.getText().toString());
 
                Double bmi = weight / (height*height);
                RadioButton rbtnStdWho = (RadioButton)findViewById(R.id.rbtnStdWho);
                RadioButton rbtnStdAisa = (RadioButton)findViewById(R.id.rbtnStdAisa);
                RadioButton rbtnStdChn = (RadioButton)findViewById(R.id.rbtnStdChn);
                if(rbtnStdWho.isChecked()) {//判断是否被选中
                    //setText就是输出响应文字
                    if(bmi < 18.5){
                        txtResult.setText("BMI:" + bmi.toString() + " 体型：过轻");
                    }
                    else if(bmi <= 24.9){
                        txtResult.setText("BMI:" + bmi.toString() + " 体型：正常");
                    }
                    else if(bmi <= 29.9){
                        txtResult.setText("BMI:" + bmi.toString() + " 体型：过重");
                    }
                    else if(bmi <= 34.9){
                        txtResult.setText("BMI:" + bmi.toString() + " 体型：肥胖");
                    }
                    else{
                        txtResult.setText("BMI:" + bmi.toString() + " 体型：非常肥胖");
                    }
                }
                else if(rbtnStdAisa.isChecked()){
                    //setText就是输出响应文字
                    if(bmi < 18.5){
                        txtResult.setText("BMI:" + bmi.toString() + " 体型：过轻");
                    }
                    else if(bmi <= 22.9){
                        txtResult.setText("BMI:" + bmi.toString() + " 体型：正常");
                    }
                    else if(bmi <= 24.9){
                        txtResult.setText("BMI:" + bmi.toString() + " 体型：过重");
                    }
                    else if(bmi <= 29.9){
                        txtResult.setText("BMI:" + bmi.toString() + " 体型：肥胖");
                    }
                    else{
                        txtResult.setText("BMI:" + bmi.toString() + " 体型：非常肥胖");
                    }
                }
                else if(rbtnStdChn.isChecked()){
                    //setText就是输出响应文字
                    if(bmi < 18.5){
                        txtResult.setText("BMI:" + bmi.toString() + " 体型：过轻");
                    }
                    else if(bmi <= 23.9){
                        txtResult.setText("BMI:" + bmi.toString() + " 体型：正常");
                    }
                    else if(bmi <= 27.9){
                        txtResult.setText("BMI:" + bmi.toString() + " 体型：过重");
                    }
                    else{
                        txtResult.setText("BMI:" + bmi.toString() + " 体型：非常肥胖");
                    }
                }
                else
                {
                    txtResult.setText("请选择BMI标准");
                }
 
            }
        });
    }
}

CheckBox控件的应用

综合小案例

package com.example.littleprogram;
 
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.TextView;
 
public class MainActivity extends AppCompatActivity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        Button btnLogin = (Button)findViewById(R.id.btnLogin);
        btnLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                RadioButton loginByUserName = (RadioButton)findViewById(R.id.loginByUserName);
                RadioButton loginByPwd = (RadioButton)findViewById(R.id.loginByPwd);
                String DbUser,DbPwd;
                if(loginByUserName.isChecked()){
                    DbUser = "zhangsan";
                    DbPwd = "123456";
                }
                else{
                    DbUser = "zhangsan@sample.com";
                    DbPwd = "123456";
                }
 
                EditText txtUserName = (EditText)findViewById(R.id.txtUserName);
                EditText txtPwd = (EditText)findViewById(R.id.txtPwd);
                TextView txtResult = (TextView)findViewById(R.id.txtResult);
 
                if(txtUserName.getText().toString().equals(DbUser))
                {
                    if(txtPwd.getText().toString().equals(DbPwd)){
                        txtResult.setText("登录成功");
                    }
                    else{
                        //密码不存在
                        txtResult.setText("密码有误");
                    }
                }
                else{
                    //用户名不存在
                    txtResult.setText("用户名不存在");
                }
 
            }
        });
    }
}

FrameLayout布局
Toast控件的应用
Toast是消息提示控件
方法一：默认纯文字提示
方法二：自定义提示位置

package com.example.littleprogram;
 
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.Toast;
 
public class MainActivity extends AppCompatActivity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        Button btnLogin = (Button)findViewById(R.id.btnLogin);
        btnLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                RadioButton loginByUserName = (RadioButton)findViewById(R.id.loginByUserName);
                RadioButton loginByPwd = (RadioButton)findViewById(R.id.loginByPwd);
                String DbUser,DbPwd;
                if(loginByUserName.isChecked()){
                    DbUser = "zhangsan";
                    DbPwd = "123456";
                }
                else{
                    DbUser = "zhangsan@sample.com";
                    DbPwd = "123456";
                }
 
                EditText txtUserName = (EditText)findViewById(R.id.txtUserName);
                EditText txtPwd = (EditText)findViewById(R.id.txtPwd);
                TextView txtResult = (TextView)findViewById(R.id.txtResult);
 
                if(txtUserName.getText().toString().equals(DbUser))
                {
                    if(txtPwd.getText().toString().equals(DbPwd)){
                        //txtResult.setText("登录成功");
                        Toast toast = Toast.makeText(MainActivity.this, "登录成功", Toast.LENGTH_LONG);
                        //LENGTH_SHORT是弹出消息框的显示时间，默认是短的
                        toast.setGravity(Gravity.CENTER,0,0);
                        toast.show();
                    }
                    else{
                        //密码不存在
                        //txtResult.setText("密码有误");
                        Toast.makeText(MainActivity.this, "密码有误", Toast.LENGTH_LONG).show();
 
                    }
                }
                else{
                    //用户名不存在
                    //txtResult.setText("用户名不存在");
                    Toast.makeText(MainActivity.this, "用户名不存在", Toast.LENGTH_LONG).show();
 
                }
 
            }
        });
    }
}

方法三：自定义带图片信息提示

package com.example.littleprogram;
 
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.Toast;
 
public class MainActivity extends AppCompatActivity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        Button btnLogin = (Button)findViewById(R.id.btnLogin);
        btnLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                RadioButton loginByUserName = (RadioButton)findViewById(R.id.loginByUserName);
                RadioButton loginByPwd = (RadioButton)findViewById(R.id.loginByPwd);
                String DbUser,DbPwd;
                if(loginByUserName.isChecked()){
                    DbUser = "zhangsan";
                    DbPwd = "123456";
                }
                else{
                    DbUser = "zhangsan@sample.com";
                    DbPwd = "123456";
                }
 
                EditText txtUserName = (EditText)findViewById(R.id.txtUserName);
                EditText txtPwd = (EditText)findViewById(R.id.txtPwd);
                TextView txtResult = (TextView)findViewById(R.id.txtResult);
 
                if(txtUserName.getText().toString().equals(DbUser))
                {
                    if(txtPwd.getText().toString().equals(DbPwd)){
                        //txtResult.setText("登录成功");
                        ToastShow("登录成功");
                    }
                    else{
                        //密码不存在
                        //txtResult.setText("密码有误");
                        //Toast.makeText(MainActivity.this, "密码有误", Toast.LENGTH_LONG).show();
                        ToastShow("密码有误");
                    }
                }
                else{
                    //用户名不存在
                    //txtResult.setText("用户名不存在");
                    //Toast.makeText(MainActivity.this, "用户名不存在", Toast.LENGTH_LONG).show();
                    ToastShow("用户名不存在");
                }
            }
        });
    }
    void ToastShow(String Content){
        Toast toast = Toast.makeText(MainActivity.this, Content, Toast.LENGTH_LONG);
            //LENGTH_SHORT是弹出消息框的显示时间，默认是短的
        toast.setGravity(Gravity.CENTER,0,0);
        LinearLayout layout = (LinearLayout)toast.getView();
        ImageView img = new ImageView(getApplicationContext());
        img.setImageResource(R.drawable.ic_launcher);
        layout.addView(img,0);
        toast.show();
    }
}

方法四：自定义布局的信息提示
在实际开发中LayoutInflater这个类还是非常有用的，它的作用类似于findViewById()。不同点是LayoutInflater是用来找res/layout/下的xml布局文件，并且实例化；而findViewById()是找xml布局文件下的具体widget控件(如Button、TextView等)。
新建一个layout来自定义我们想让它显示的格式
使我们自定义的形式

package com.example.littleprogram;
 
import android.support.v4.view.LayoutInflaterCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Layout;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.Toast;
 
public class MainActivity extends AppCompatActivity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        Button btnLogin = (Button)findViewById(R.id.btnLogin);
        btnLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                RadioButton loginByUserName = (RadioButton)findViewById(R.id.loginByUserName);
                RadioButton loginByPwd = (RadioButton)findViewById(R.id.loginByPwd);
                String DbUser,DbPwd;
                if(loginByUserName.isChecked()){
                    DbUser = "zhangsan";
                    DbPwd = "123456";
                }
                else{
                    DbUser = "zhangsan@sample.com";
                    DbPwd = "123456";
                }
 
                EditText txtUserName = (EditText)findViewById(R.id.txtUserName);
                EditText txtPwd = (EditText)findViewById(R.id.txtPwd);
                TextView txtResult = (TextView)findViewById(R.id.txtResult);
 
                if(txtUserName.getText().toString().equals(DbUser))
                {
                    if(txtPwd.getText().toString().equals(DbPwd)){
                        //txtResult.setText("登录成功");
                        ToastShow("登录成功");
                    }
                    else{
                        //密码不存在
                        //txtResult.setText("密码有误");
                        //Toast.makeText(MainActivity.this, "密码有误", Toast.LENGTH_LONG).show();
                        ToastShow("密码有误");
                    }
                }
                else{
                    //用户名不存在
                    //txtResult.setText("用户名不存在");
                    //Toast.makeText(MainActivity.this, "用户名不存在", Toast.LENGTH_LONG).show();
                    ToastShow("用户名不存在");
                }
            }
        });
    }
    void ToastShow(String Content){
        Toast toast = Toast.makeText(MainActivity.this, Content, Toast.LENGTH_LONG);
            //LENGTH_SHORT是弹出消息框的显示时间，默认是短的
        View view = LayoutInflater.from(MainActivity.this).inflate(R.layout.toast_template,null);
        TextView txtToastContent = (TextView)view.findViewById(R.id.txtToastContent);
        txtToastContent.setText(Content);
        toast.setView(view);
        toast.show();
    }
}

PopupWindow的用途

package com.example.littleprogram;
 
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.PopupWindow;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.Toast;
 
public class MainActivity extends AppCompatActivity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        Button btnLogin = (Button)findViewById(R.id.btnLogin);
        btnLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                RadioButton loginByUserName = (RadioButton)findViewById(R.id.loginByUserName);
                RadioButton loginByPwd = (RadioButton)findViewById(R.id.loginByPwd);
                String DbUser,DbPwd;
                if(loginByUserName.isChecked()){
                    DbUser = "zhangsan";
                    DbPwd = "123456";
                }
                else{
                    DbUser = "zhangsan@sample.com";
                    DbPwd = "123456";
                }
 
                EditText txtUserName = (EditText)findViewById(R.id.txtUserName);
                EditText txtPwd = (EditText)findViewById(R.id.txtPwd);
                //TextView txtResult = (TextView)findViewById(R.id.txtResult);
 
                if(txtUserName.getText().toString().equals(DbUser))
                {
                    if(txtPwd.getText().toString().equals(DbPwd)){
                        //txtResult.setText("登录成功");
                        ToastShow("登录成功");
                    }
                    else{
                        //密码不存在
                        //txtResult.setText("密码有误");
                        //Toast.makeText(MainActivity.this, "密码有误", Toast.LENGTH_LONG).show();
                        ToastShow("密码有误");
                    }
                }
                else{
                    //用户名不存在
                    //txtResult.setText("用户名不存在");
                    //Toast.makeText(MainActivity.this, "用户名不存在", Toast.LENGTH_LONG).show();
                    ToastShow("用户名不存在");
                }
            }
        });
 
        final Button btnReg = (Button)findViewById(R.id.btnReg);
        btnReg.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                View contentView = LayoutInflater.from(MainActivity.this).inflate(R.layout.popup_content,null,false);
                //contentView代表着我们登陆选项的布局设计
                PopupWindow window = new PopupWindow(contentView, LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT,true);
                window.setTouchable(true);
                window.showAsDropDown(btnReg,0,0, Gravity.BOTTOM);
                //window.showAtLocation(getWindow().getDecorView(),Gravity.BOTTOM,0,0);
            }
        });
 
    }
    void ToastShow(String Content){
        Toast toast = Toast.makeText(MainActivity.this, Content, Toast.LENGTH_LONG);
            //LENGTH_SHORT是弹出消息框的显示时间，默认是短的
        View view = LayoutInflater.from(MainActivity.this).inflate(R.layout.toast_template,null);
        TextView txtToastContent = (TextView)view.findViewById(R.id.txtToastContent);
        txtToastContent.setText(Content);
        toast.setView(view);
        toast.show();
    }
}

package com.example.littleprogram;
 
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.PopupWindow;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.Toast;
 
public class MainActivity extends AppCompatActivity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        Button btnLogin = (Button)findViewById(R.id.btnLogin);
        btnLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                RadioButton loginByUserName = (RadioButton)findViewById(R.id.loginByUserName);
                RadioButton loginByPwd = (RadioButton)findViewById(R.id.loginByPwd);
                String DbUser,DbPwd;
                if(loginByUserName.isChecked()){
                    DbUser = "zhangsan";
                    DbPwd = "123456";
                }
                else{
                    DbUser = "zhangsan@sample.com";
                    DbPwd = "123456";
                }
 
                EditText txtUserName = (EditText)findViewById(R.id.txtUserName);
                EditText txtPwd = (EditText)findViewById(R.id.txtPwd);
                //TextView txtResult = (TextView)findViewById(R.id.txtResult);
 
                if(txtUserName.getText().toString().equals(DbUser))
                {
                    if(txtPwd.getText().toString().equals(DbPwd)){
                        //txtResult.setText("登录成功");
                        ToastShow("登录成功");
                    }
                    else{
                        //密码不存在
                        //txtResult.setText("密码有误");
                        //Toast.makeText(MainActivity.this, "密码有误", Toast.LENGTH_LONG).show();
                        ToastShow("密码有误");
                    }
                }
                else{
                    //用户名不存在
                    //txtResult.setText("用户名不存在");
                    //Toast.makeText(MainActivity.this, "用户名不存在", Toast.LENGTH_LONG).show();
                    ToastShow("用户名不存在");
                }
            }
        });
 
        final Button btnReg = (Button)findViewById(R.id.btnReg);
        btnReg.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                View contentView = LayoutInflater.from(MainActivity.this).inflate(R.layout.popup_content,null,false);
                //contentView代表着我们登陆选项的布局设计
                PopupWindow window = new PopupWindow(contentView, LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT,true);
                window.setTouchable(true);
                //window.showAsDropDown(btnReg,0,0, Gravity.BOTTOM);
                window.showAtLocation(getWindow().getDecorView(),Gravity.BOTTOM,0,0);
            }
        });
 
    }
    void ToastShow(String Content){
        Toast toast = Toast.makeText(MainActivity.this, Content, Toast.LENGTH_LONG);
            //LENGTH_SHORT是弹出消息框的显示时间，默认是短的
        View view = LayoutInflater.from(MainActivity.this).inflate(R.layout.toast_template,null);
        TextView txtToastContent = (TextView)view.findViewById(R.id.txtToastContent);
        txtToastContent.setText(Content);
        toast.setView(view);
        toast.show();
    }
}

Alert Dialog的应用
警告窗体

package com.example.littleprogram;

  
import android.content.DialogInterface;

import android.support.v7.app.AlertDialog;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.Gravity;

import android.view.LayoutInflater;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.LinearLayout;

import android.widget.PopupWindow;

import android.widget.RadioButton;

import android.widget.TextView;

import android.widget.Toast;

  
public class MainActivity extends AppCompatActivity {

  
    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

  
        Button btnLogin = (Button)findViewById(R.id.btnLogin);

        btnLogin.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                RadioButton loginByUserName = (RadioButton)findViewById(R.id.loginByUserName);

                RadioButton loginByPwd = (RadioButton)findViewById(R.id.loginByPwd);

                String DbUser,DbPwd;

                if(loginByUserName.isChecked()){

                    DbUser = "zhangsan";

                    DbPwd = "123456";

                }

                else{

                    DbUser = "zhangsan@sample.com";

                    DbPwd = "123456";

                }

  
                EditText txtUserName = (EditText)findViewById(R.id.txtUserName);

                EditText txtPwd = (EditText)findViewById(R.id.txtPwd);

                //TextView txtResult = (TextView)findViewById(R.id.txtResult);

  
                if(txtUserName.getText().toString().equals(DbUser))

                {

                    if(txtPwd.getText().toString().equals(DbPwd)){

                        //txtResult.setText("登录成功");

                        ToastShow("登录成功");

                    }

                    else{

                        //密码不存在

                        //txtResult.setText("密码有误");

                        //Toast.makeText(MainActivity.this, "密码有误", Toast.LENGTH_LONG).show();

                        ToastShow("密码有误");

                    }

                }

                else{

                    //用户名不存在

                    //txtResult.setText("用户名不存在");

                    //Toast.makeText(MainActivity.this, "用户名不存在", Toast.LENGTH_LONG).show();

                    ToastShow("用户名不存在");

                }

            }

        });

  
        final Button btnReg = (Button)findViewById(R.id.btnReg);

        btnReg.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                AlertDialog alert = new AlertDialog.Builder(MainActivity.this).create();

                alert.setTitle("用户协议确认");

                alert.setIcon(R.drawable.ic_launcher);

                alert.setMessage("注册新用户需要接受用户协议，请您认真阅读用户协议内容，并选择是否同意接受用户协议");

                alert.setButton(AlertDialog.BUTTON_POSITIVE, "确认", new DialogInterface.OnClickListener() {

                    @Override

                    public void onClick(DialogInterface dialog, int which) {

                        View contentView = LayoutInflater.from(MainActivity.this).inflate(R.layout.popup_content,null,false);

                        //contentView代表着我们登陆选项的布局设计

                        PopupWindow window = new PopupWindow(contentView, LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT,true);

                        window.setTouchable(true);

                        window.showAsDropDown(btnReg,0,0, Gravity.BOTTOM);

                        //window.showAtLocation(getWindow().getDecorView(),Gravity.BOTTOM,0,0);

                    }

                });

                alert.setButton(AlertDialog.BUTTON_NEGATIVE, "不同意", new DialogInterface.OnClickListener() {

                    @Override

                    public void onClick(DialogInterface dialog, int which) {

                        ToastShow("只有接受用户协议才能注册新用户");

  
                    }

                });

                alert.show();

            }

        });

  
    }

    void ToastShow(String Content){

        Toast toast = Toast.makeText(MainActivity.this, Content, Toast.LENGTH_LONG);

            //LENGTH_SHORT是弹出消息框的显示时间，默认是短的

        View view = LayoutInflater.from(MainActivity.this).inflate(R.layout.toast_template,null);

        TextView txtToastContent = (TextView)view.findViewById(R.id.txtToastContent);

        txtToastContent.setText(Content);

        toast.setView(view);

        toast.show();

    }

}

CustomDialog的应用
自定义对话框
最常用的一种方法

package com.example.littleprogram;

  
import android.content.DialogInterface;

import android.support.v7.app.AlertDialog;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.Gravity;

import android.view.LayoutInflater;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.LinearLayout;

import android.widget.PopupWindow;

import android.widget.RadioButton;

import android.widget.TextView;

import android.widget.Toast;

  
public class MainActivity extends AppCompatActivity {

  
    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

  
        Button btnLogin = (Button)findViewById(R.id.btnLogin);

        btnLogin.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                RadioButton loginByUserName = (RadioButton)findViewById(R.id.loginByUserName);

                RadioButton loginByPwd = (RadioButton)findViewById(R.id.loginByPwd);

                String DbUser,DbPwd;

                if(loginByUserName.isChecked()){

                    DbUser = "zhangsan";

                    DbPwd = "123456";

                }

                else{

                    DbUser = "zhangsan@sample.com";

                    DbPwd = "123456";

                }

  
                EditText txtUserName = (EditText)findViewById(R.id.txtUserName);

                EditText txtPwd = (EditText)findViewById(R.id.txtPwd);

                //TextView txtResult = (TextView)findViewById(R.id.txtResult);

  
                if(txtUserName.getText().toString().equals(DbUser))

                {

                    if(txtPwd.getText().toString().equals(DbPwd)){

                        //txtResult.setText("登录成功");

                        ToastShow("登录成功");

                    }

                    else{

                        //密码不存在

                        //txtResult.setText("密码有误");

                        //Toast.makeText(MainActivity.this, "密码有误", Toast.LENGTH_LONG).show();

                        ToastShow("密码有误");

                    }

                }

                else{

                    //用户名不存在

                    //txtResult.setText("用户名不存在");

                    //Toast.makeText(MainActivity.this, "用户名不存在", Toast.LENGTH_LONG).show();

                    ToastShow("用户名不存在");

                }

            }

        });

  
        final Button btnReg = (Button)findViewById(R.id.btnReg);

        btnReg.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                CustomDialog customDialog = new CustomDialog(MainActivity.this, new CustomDialog.OnCustomDialogListener(){

                   @Override

                    public void btnConfirmLicenseClicked(boolean isConfirm){

                       if(isConfirm == false){

                           ToastShow("只有接受用户协议才能注册新用户");

                       }

                        else{

                            ToastShow("感谢您成为我们的新用户");

                       }

                   }

                });

                customDialog.show();

  
                /*

                AlertDialog alert = new AlertDialog.Builder(MainActivity.this).create();

                alert.setTitle("用户协议确认");

                alert.setIcon(R.drawable.ic_launcher);

                alert.setMessage("注册新用户需要接受用户协议，请您认真阅读用户协议内容，并选择是否同意接受用户协议");

                alert.setButton(AlertDialog.BUTTON_POSITIVE, "确认", new DialogInterface.OnClickListener() {

                    @Override

                    public void onClick(DialogInterface dialog, int which) {

                        View contentView = LayoutInflater.from(MainActivity.this).inflate(R.layout.popup_content,null,false);

                        //contentView代表着我们登陆选项的布局设计

                        PopupWindow window = new PopupWindow(contentView, LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT,true);

                        window.setTouchable(true);

                        window.showAsDropDown(btnReg,0,0, Gravity.BOTTOM);

                        //window.showAtLocation(getWindow().getDecorView(),Gravity.BOTTOM,0,0);

                    }

                });

                alert.setButton(AlertDialog.BUTTON_NEGATIVE, "不同意", new DialogInterface.OnClickListener() {

                    @Override

                    public void onClick(DialogInterface dialog, int which) {

                        ToastShow("只有接受用户协议才能注册新用户");

                    }

                });

                alert.show();

                */

            }

        });

  
    }

    void ToastShow(String Content){

        Toast toast = Toast.makeText(MainActivity.this, Content, Toast.LENGTH_LONG);

            //LENGTH_SHORT是弹出消息框的显示时间，默认是短的

        View view = LayoutInflater.from(MainActivity.this).inflate(R.layout.toast_template,null);

        TextView txtToastContent = (TextView)view.findViewById(R.id.txtToastContent);

        txtToastContent.setText(Content);

        toast.setView(view);

        toast.show();

    }

}

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51CTO	软考资讯

android decorview根布局 android布局控件

android decorview根布局 android布局控件

什么是布局

LinearLayout布局的应用

RelativeLayout布局的应用

TextView控件

EditText控件

Button控件的应用

RadioButton控件的应用

CheckBox控件的应用

综合小案例

FrameLayout布局

Toast控件的应用

PopupWindow的用途

Alert Dialog的应用

CustomDialog的应用

51CTO博客