Android基本监听
示例
“侦听器”或“观察者”模式是在Android开发中创建异步回调的最常见策略。
public class MyCustomObject {
//1-定义接口
public interface MyCustomObjectListener {
public void onAction(String action);
}
//2-声明您的侦听器对象
private MyCustomObjectListener listener;
// 并在构造函数中对其进行初始化
public MyCustomObject() {
this.listener= null;
}
//3-创建您的监听器设置器
public void setCustomObjectListener(MyCustomObjectListener listener) { this.listener= listener;
}
// 4-触发侦听器事件
public void makeSomething(){
if (this.listener != null){
listener.onAction("hello!");
}
}现在在您的活动中：
public class MyActivity extends Activity {
public final String TAG = "MyActivity";
@Override
protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
MyCustomObject mObj = new MyCustomObject();
//5-实现侦听器回调
mObj.setCustomObjectListener(new MyCustomObjectListener() {
@Override
public void onAction(String action) {
Log.d(TAG, "Value: "+action);
}
});
}
}