Android弹出对话框实例

1

package com.example.a;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
public static final int SAVE = Menu.FIRST;
public static final int RETURN_MENU = Menu.FIRST + 1;
public static final int QUIT = Menu.FIRST + 2;

@Override
public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ImageButton btnButton=(ImageButton)this.findViewById(R.id.btn);
btnButton.setOnClickListener(new MyListener());
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
menu.add(0, SAVE, 0, "保存");
menu.add(0, RETURN_MENU, 1, "返回主菜单");
menu.add(0, QUIT, 2, "退出");
return super.onCreateOptionsMenu(menu);

}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
TextView tv = (TextView) findViewById(R.id.txt);
switch (item.getItemId()) {
case SAVE:
tv.setText("保存按钮被点击");
break;
case RETURN_MENU:
tv.setText("返回主菜单按钮被点击");
break;
case QUIT:
tv.setText("退出按钮被点击");
break;
}
return super.onOptionsItemSelected(item);
}

private class MyListener implements View.OnClickListener {

@Override
public void onClick(View v) {

Dialog dia = new AlertDialog.Builder(MainActivity.this).setTitle("要干什么")
.setPositiveButton("我再想想", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this, "我再想呢", 1);
}
}).setNegativeButton("要不退出吧", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this, "haha", 1);
MainActivity.this.finish();
}
}).show();

}
}
}

2 效果图