Android入门：AlterDialog初步

      AlterDialog类的构造方法被声明成protected方法，因此，不能直接使用new关键字来创造对象实例。每个对话框最多自能添加三个Button，方法分别是：setNegativeButton，setNeutralButton，setPositiveButton。并且按钮出现顺序同上，如果相同的方法调用多次，以最后一次为准。具体见代码：

 

package me.chendd.dialog;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class AndroidDialogActivity extends Activity implements OnClickListener{
        /** Called when the activity is first created. */
        @Override
        public void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.main);
                Button button = (Button)findViewById(R.id.button);
                button.setOnClickListener(this);
        }
        @ Override
  public void onClick(View v) {
    // TODO Auto-generated method stub
    new AlertDialog.Builder(this).setIcon(R.drawable.ic_launcher).
    setTitle("是否删除文件").setPositiveButton("确定",    
        new DialogInterface.OnClickListener() {
                @Override
          public void onClick(DialogInterface dialog, int whichButton) {
            new AlertDialog.Builder(AndroidDialogActivity.this).setMessage(
                "文件已被删除。").create().show();
          }
        }).setNegativeButton("取消",    
        new DialogInterface.OnClickListener() {
            
          @Override
          public void onClick(DialogInterface dialog, int whichButton) {
            // TODO Auto-generated method stub
            new AlertDialog.Builder(AndroidDialogActivity.this).setMessage(
                "你选择了取消按钮，文件未被删除。").create().show();
          }
        }).setNeutralButton("忽略",    
        new DialogInterface.OnClickListener() {
            
          @Override
          public void onClick(DialogInterface dialog, int whichButton) {
            // TODO Auto-generated method stub
            new AlertDialog.Builder(AndroidDialogActivity.this).setMessage(
                "你选择了忽略按钮").create().show();
          }
        }).show();
  }

}

 

 

单击显示按钮：

 

 

 

注意按钮的顺序，单击“取消”

 

 

 

单击“忽略”

 

 

单击“确定”：