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我試圖從視圖MyView
中獲取我的MyActivity
和int
。在我的活動我有以下幾點:活動和視圖之間的接口的實現錯誤
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);
}
}
現在MyView
包含以下代碼:
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);
}
我可以編譯沒有問題的代碼,但在logcat中我得到以下錯誤:
致命例外:main 進程:com.example.ex,PID:8035 java.lang.ClassCastException:android.app.Appli陽離子不能被轉換 到com.example.ex.myView $ GetCallBack 在com.example.ex.myView。(myView.java:49)
我知道錯誤與環境相關的,但我還沒有找到一種方法來糾正它,
任何想法將非常感激! :)
改變了資本;) – Alvaro
'myView'也應改爲'MyView'。 –