监听4 种方式

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.button);

        Button but1 = (Button) findViewById(R.id.but01);
        //生成监听器类的对象
        ButtonListener buttonListener = new ButtonListener();
        //为按钮添加监听器
        but1.setOnClickListener(buttonListener);
    }


    //内部类
    class ButtonListener implements View.OnClickListener {

        @Override
        public void onClick(View view) {
            Toast.makeText(MainActivity.this,"按钮被点击",Toast.LENGTH_SHORT).show();
        }
    }
}