ToggleButton实现灯泡的开关

public class MainActivity extends Activity implements OnCheckedChangeListener {
private ToggleButton tb;
private ImageView img;

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

tb = (ToggleButton) findViewById(R.id.toggleButton1);
img = (ImageView) findViewById(R.id.imageView1);

tb.setOnCheckedChangeListener(this);
}

public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
    // TODO Auto-generated method stub
    img.setBackgroundResource(isChecked?R.drawable.on:R.drawable.off);
}

}

<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"

android:id="@+id/container" 
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<ToggleButton
    android:checked="false"
    android:textOn="开"
    android:textOff="关"
    android:id="@+id/toggleButton1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    />

<ImageView
    android:id="@+id/imageView1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/off" />

这个MainActivity和setOnCheckedChangeListener错了，我是照着视频打得，不知道为什么错了。

有提示什么报错没？贴一下报错信息。

为什么你的oncheckedchanged没有@override