警告对话框

public class MainActivity extends Activity {
    private Button button;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = (Button) findViewById(R.id.button1);
    }

    public void myClick(View view) {
        // 创建一个对话框对象
        AlertDialog.Builder builder = new Builder(MainActivity.this);
        builder.setTitle("约吗？");
        // builder.setCancelable(false);//对话框弹出之后不让取消
        builder.setIcon(R.drawable.yue);
        builder.setMessage("今天是个好日子");
        builder.setNegativeButton("不约", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(MainActivity.this, "不好意思，我是正经人，不约", 0).show();
            }
        });
        builder.setPositiveButton("约", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(MainActivity.this, "那就一起约吧", 0).show();
            }
        });
        // View view2 = getLayoutInflater().inflate(R.layout.activity_main2,
        // null);
        // builder.setView(view2);
        builder.show();

    }

    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}