1.獲得AlertDialog的靜態(tài)內(nèi)部類Builder對象，由此類來創(chuàng)建對話框
2.通過Builder對象設置對話框的標題按鈕以及按鈕響應的事件
3.調(diào)用Builder的Create()方法創(chuàng)建對話框
4.調(diào)用AlertDialog的show()方法顯示對話框

main.xml文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  >
<TextView
  android:id="@+id/MyTextView"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="@string/hello"
  />
<Button
  android:id="@+id/myButton"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="創(chuàng)建Alert對話框"
  />
</LinearLayout>

MainActivity文件

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    myTextView = (TextView)findViewById(R.id.MyTextView);
    myButton = (Button)findViewById(R.id.myButton);
    //添加AlertDialog.Builder對象
    final AlertDialog.Builder builder = new AlertDialog.Builder(this);
    //為activity中按鈕添加按鈕事件
    myButton.setOnClickListener(new View.OnClickListener()
    {
    @Override
    public void onClick(View v)
    {
      builder.setTitle("您確定要刪除此條信息?").
      //設置確定按鈕
      setPositiveButton("Yes", new OnClickListener()
      {
        @Override
        public void onClick(DialogInterface dialog, int which)
        {
          myTextView.setText("刪除成功");
        }
      }).
      //設置取消按鈕
      setNegativeButton("No", new OnClickListener()
      {
        @Override
        public void onClick(DialogInterface dialog, int which)
        {
          myTextView.setText("取消刪除");
        }
      });
       //創(chuàng)建對話框
        AlertDialog alertDialog = builder.create();
        //顯示對話框
        alertDialog.show();
    }
    });
  }
}