Android(安卓)Stdio实现点击按钮出现图片

public class MainActivity extends AppCompatActivity {    private ImageView imageView = null;    private Button bt1 = null;//图1    private Button bt2 = null;//图2    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        imageView = (ImageView) findViewById(R.id.photo);        bt1 = (Button) findViewById(R.id.button_1);        bt1.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                if(v==bt1){                    imageView.setImageResource( R.drawable.face2);                }            }        });        bt2 = (Button) findViewById(R.id.button_2);        bt2.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                if (v==bt2){                    imageView.setImageResource( R.drawable.wanglibo);                }            }        });    }

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