Android开发笔记

Android 中国SDK:

http://wear.techbrood.com/

Android SDK Manager 代理设置： 

使用Intellij Idea 开发Android：

http://www.tuicool.com/articles/a2MNna

 

得到当前Activity的RelativeLayout

RelativeLayout root = (RelativeLayout)View.inflate(this, R.layout.activity_main, null);

遍历控件

http://www.open-open.com/lib/view/open1391951537129.html

/**
 
* @note 获取该activity所有view
 
* */
 
public List<View> getAllChildViews() {
 
View view = this.getWindow().getDecorView();
 
return getAllChildViews(view);
 
}
 
 
private List<View> getAllChildViews(View view) {
 
List<View> allchildren = new ArrayList<View>();
 
if (view instanceof ViewGroup) {
 
ViewGroup vp = (ViewGroup) view;
 
for (int i = 0; i < vp.getChildCount(); i++) {
 
View viewchild = vp.getChildAt(i);
 
allchildren.add(viewchild);
 
allchildren.addAll(getAllChildViews(viewchild));
 
}
 
}
 
return allchildren;
 
}

 

获取最上层Activity

http://blog.sina.com.cn/s/blog_4c0706560101063n.html

 

 String getTopActivity(Activity context)
{
     ActivityManager manager = (ActivityManager)context.getSystemService(ACTIVITY_SERVICE) ;
     List<RunningTaskInfo> runningTaskInfos = manager.getRunningTasks(1) ;
         
     if(runningTaskInfos != null)
       return (runningTaskInfos.get(0).topActivity).toString() ;
          else
       return null ;
}

 

最后不要忘记在AndroidManifest.xml中增加权限：

<uses-permission android:name = “android.permission.GET_TASKS”/>

这个方法可能没有用，我所需要的是获取当前程序的当前Activity

 

网格权限

socket failed:EACCES(Permission denied)
Android净干这脱了裤子放屁的事，写个代码，还要指定权限，就不让程序员省心。

做一个最全的权限，放到 AndroidManifest 里吧。

官方定义：http://developer.android.com/reference/android/Manifest.permission.html

中文：http://blog.sina.com.cn/s/blog_798c1d510101d744.html

 

<uses-permission android:name="android.permission.INTERNET" />

 

Ajax助手类

让我们实现一个类似于 jQuery 的Ajax 方法吧。 万恶的Java没有实现这个方法。

package cmn;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.AsyncTask;
import android.widget.Toast;

import com.google.gson.Gson;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.CoreConnectionPNames;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import dzx.cn.dzx.R;

/**
 * Created by Administrator on 2015/7/14.
 */
public class NetHelper {
    public static void Post(Activity context,String Url, StringDict dict, IAjaxCallback callback) {
        new NetExecuter().Post(context,Url, dict, callback);
    }
}

class NetExecuter {
    private  String ErrorMsg;

    public void Post(final Activity context, String Url, final StringDict Dict, final IAjaxCallback Callback) {
        ErrorMsg = "";

        AsyncTask<String, StringDict, String> task = new AsyncTask<String, StringDict, String>() {
            @Override
            protected void onPreExecute() {
                super.onPreExecute();
            }

            @Override
            protected String doInBackground(String... params) {
                String MyUrl = params[0];
                HttpPost httpRequest = new HttpPost(MyUrl);
                HttpResponse httpResponse = null;
                List<NameValuePair> param = new ArrayList<NameValuePair>();
                if (Dict != null) {
                    for (final Map.Entry<String, String> entry : Dict.entrySet()) {
                        param.add(new NameValuePair() {
                            @Override
                            public String getName() {
                                return entry.getKey();
                            }

                            @Override
                            public String getValue() {
                                return entry.getValue();
                            }
                        });
                    }
                }

                try {
                    httpRequest.setEntity(new UrlEncodedFormEntity(param, HTTP.UTF_8));
                    DefaultHttpClient client = new DefaultHttpClient();
                    client.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 1000);
                    httpResponse = client.execute(httpRequest);

                    int status = httpResponse.getStatusLine().getStatusCode();
                    String strResult = EntityUtils.toString(httpResponse.getEntity());

                    return strResult;
                } catch (Exception e) {
                    ErrorMsg = e.getMessage();
                    return "";
                }
            }

            @Override
            protected void onPostExecute(String result) {
                super.onPostExecute(result);

                if( ErrorMsg.isEmpty()== false){
                    Toast.makeText(context.getApplicationContext(), ErrorMsg,
                            Toast.LENGTH_SHORT).show();
                    return;
                }
                Callback.exec(new Gson().fromJson(result, JsonMsg.class));
            }
        };

        task.execute(Url);
    }
}

View Code

调用：

NetHelper.Post("http://192.168.1.33/dzx/ajax/city/getCityInfo/1", null, new IAjaxCallback() {
                    @Override
                    public void exec(JsonMsg jm) {
                        TextView txt = (TextView) findViewById(R.id.textView);
                        txt.setText(jm.GetString("Name"));
                    }
 });

 

ListInt 助手类定义

当我发现 Java 不能定义 List<int>，我疯了。Java 里居然有 int 和 Integer ！这是怎样的一群人造出的Java这个杂种！

定义一个ListInt 助手类吧。

package Base;

import java.util.ArrayList;

/**
 * Created by udi on 2015/7/20.
 */
public class ListInt {
    private ArrayList<Object> data = new ArrayList<Object>();
    public int getLength()
    {
        return data.size();
    }

    public int Get(int Index){
        return (int) data.get(Index);
    }

    public void Add(int Value){
        data.add(Value);
    }

    public void AddRange(ListInt Value){
        for(int i=0;i< Value.getLength();i++){
            data.add( Value.Get(i)) ;
        }
    }

    public void Insert(int Index,int Value){
        data.add(Index,Value);
    }

    public void RemoveAt(int Index) {
        data.remove(Index);
    }

    public void Clear(){
        data.clear();
    }

    public int[] ToArray(){
        int[] retVal = new int[data.size()];
        for(int i=0;i< data.size();i++){
            retVal[i] = (int)data.get(i);
        }
        return retVal;
    }
}

View Code

ActionBarActivity基类

主要实现 GetJson,SetJson。

package Base;

import android.app.Activity;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.ActionBarActivity;
import android.view.TextureView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.RelativeLayout;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import cmn.StringDict;
import dzx.cn.dzx.R;

/**
 * Created by Administrator on 2015/7/14.
 */
public class MyActionBarActivity extends ActionBarActivity {

    protected Activity context = this;

    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    public void SetJson(String Prefix, HashMap<String, String> Model) {
        for (Map.Entry<String, String> entry : Model.entrySet()) {
            String key = entry.getKey();
            if (Prefix != null && key.startsWith(Prefix) == false) {
                continue;
            }

            String value = entry.getValue();


            int ResID = GetResID(key);
            if (ResID <= 0) continue;

            View view = findViewById(ResID);
            if (view == null) continue;

            if (view instanceof TextView) {
                ((TextView) view).setText(value);
            }
        }
    }
    public RelativeLayout GetRoot(){
        return (RelativeLayout)View.inflate(this, getResources().getIdentifier("activity_main", "layout", getPackageName()) , null);
    }
    public StringDict GetJson(String Prefix) {
        StringDict dict = new StringDict();

        ListInt views = GetAllTextView(GetRoot());

        for (int id : views.ToArray()) {
            String key = getResources().getResourceName(id);
            if( key.contains("/")){
                String[] each =  key.split("/") ;
                key = each[each.length -1];
            }

            if( Prefix != null && key.startsWith(Prefix) == false)
            {
                continue;
            }

            String val =((TextView) findViewById(id)).getText().toString();
            dict.put(key,val);
        }
        return dict;
    }

    public int GetResID(String ResKey) {
        return getResources().getIdentifier(ResKey, "id", getPackageName());
    }

    private ListInt GetAllTextView(ViewGroup root) {
        if (root == null) return new ListInt();
        ListInt list = new ListInt();

        for (int len = root.getChildCount() - 1; len >= 0; len--) {
            View v = root.getChildAt(len);
            if (v instanceof ViewGroup) {
                list.AddRange(GetAllTextView((ViewGroup) v));
            } else if (v instanceof TextView) {
                list.Add(v.getId());
            }
        }

        return list;
    }
}

View Code

 

对应的C# WinForm方法，更优雅。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

using StringDict = System.Collections.Generic.Dictionary<string, string>;

namespace WindowsFormsApplication1
{
    public class MyForm : Form
    {
        public void SetJson(string Prefix, StringDict dict)
        {
            if (Prefix == null)
            {
                Prefix = "";
            }

            Func<Control, Control[]> GetControl =null;

            var _GetControl = new Func<Control, Control[]>(c =>
            {
                var list = new List<Control>();
                if (c.HasChildren)
                {
                    foreach (Control con in c.Controls)
                    {
                        list.AddRange(GetControl(con));
                    }
                }
                else
                {
                    list.Add(c);
                }
                return list.ToArray();
            });
            GetControl = _GetControl;

            foreach (var c in GetControl(this))
            {
                dict.All(kv =>
                {
                    if (c.Name == Prefix + kv.Key)
                    {
                        c.Text = kv.Value;
                        return false;
                    }
                    return true;
                });
            }
        }

        public StringDict GetJson(string Prefix)
        {
            if (Prefix == null)
            {
                Prefix = "";
            }
            var dict = new StringDict();

            Func<Control, Control[]> GetControl = null;

            var _GetControl = new Func<Control, Control[]>(c =>
            {
                var list = new List<Control>();
                if (c.HasChildren)
                {
                    foreach (Control con in c.Controls)
                    {
                        list.AddRange(GetControl(con));
                    }
                }
                else
                {
                    if (c is TextBox)
                    {
                        list.Add(c);
                    }
                }
                return list.ToArray();
            });
            GetControl = _GetControl;

            foreach (var c in GetControl(this))
            {
                if (c.Name.StartsWith(Prefix))
                {
                    dict[c.Name.Substring(Prefix.Length)] = c.Text;
                }
            }
            return dict;
        }
    }
}

View Code

 

作者：NewSea        如无特别标记说明，均为NewSea原创，版权私有，翻载必纠。欢迎交流，转载，但要在页面明显位置给出原文连接。谢谢。