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我试图从视图MyView
中获取我的MyActivity
和int
。在我的活动我有以下几点:活动和视图之间的接口的实现错误
public class MyActivity extends AppCompatActivity implements MyView.GetCallBack {
final MyActivity context = this;
private AsyncTask<Void, Void, Void> task;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second_act);
task = new myTask();
task.execute();
}
@Override
public void onPercentageReceived(int msg){
// you have got your msg here.
}
public class MyTask extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected Void doInBackground(Void... params) {
}
@Override
protected void onPostExecute(Void result) {
LinearLayout surface = (LinearLayout) findViewById(R.id.surfaceView);
surface.addView(new MyView(getApplicationContext()));
surface.setBackgroundColor(Color.BLACK);
}
}
现在MyView
包含以下代码:
public class MyView extends View {
final MyView context = this;
private GetCallBack callback;
// Constructor
public PlacingBoxView(Context context) {
super(context);
callback = (GetCallBack) context;
}
@Override
protected void onDraw(Canvas canvas) {
dataPercentage(Percentage);
}
public void dataPercentage(int Percentage){
callback.onPercentageReceived(Percentage);
}
public interface GetCallBack{
void onPercentageReceived(int msg);
}
我可以编译没有问题的代码,但在logcat中我得到以下错误:
致命例外:main 进程:com.example.ex,PID:8035 java.lang.ClassCastException:android.app.Appli阳离子不能被转换 到com.example.ex.myView $ GetCallBack 在com.example.ex.myView。(myView.java:49)
我知道错误与环境相关的,但我还没有找到一种方法来纠正它,
任何想法将非常感激! :)
改变了资本;) – Alvaro
'myView'也应改为'MyView'。 –