iv.setBackground(isChecked?R.drawable.off:R.drawable.off);這一行為什么會報錯
public class Demo02 extends Activity ?implements OnCheckedChangeListener{
? ?private ToggleButton tb;
? ?private ImageView iv;
? ?@Override
? ?protected void onCreate(Bundle savedInstanceState) {
? ? ? ?super.onCreate(savedInstanceState);
? ? ? ?setContentView(R.layout.demo02);
? ? ? ?tb = (ToggleButton) findViewById(R.id.toggleButton01);
? ? ? ?iv = (ImageView) findViewById(R.id.imageView01);
? ? ? ?tb.setOnCheckedChangeListener(this);
? ?}
? ?public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
? ? ? ?iv.setBackground(isChecked?R.drawable.off:R.drawable.off);
? ? ? ?
? ?}
? ?}
2017-03-23
正確的應該是：iv.setBackgroundResource(isChecked ? R.drawable.on : R.drawable.off);