java - 从异步任务类获取值到另一个类

Question

This is the error

这是我的 asyncResponse.java

 public interface asyncResponse {

    void processFinish(String output);
}

这是我的 Trialmenu.java，我想在其中检索我的值

abstract class trialmenu extends AppCompatActivity implements asyncResponse{
private ImageView logo;
private TextView status;

AsyncStatus asyncTask =new  AsyncStatus();


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

    logo = (ImageView) findViewById(R.id.imglogo);
    status = (TextView) findViewById(R.id.txtStatus);

    AsyncStatus.delegate = this;


}



void processFinish(String output) {
    status.setText(output);


}
}

这是我的 AsyncStatus.java，出于隐私原因我没有发布我的 doInBackground

public class AsyncStatus extends AsyncTask<String, String, StringBuilder> {

public static asyncResponse delegate=null;

@Override
protected void onPostExecute(StringBuilder result) {
    super.onPostExecute(result);

    delegate.processFinish(result.toString());


}
}

Answer 1

您必须注册回调到AsyncTask类。

 public class AsyncStatus extends AsyncTask<String, String, StringBuilder> {

    public asyncResponse delegate=null;

    public void setDelegate(asyncResponse delegate){
            this.delegate=delegate;
    }

    @Override
    protected void onPostExecute(StringBuilder result) {
        super.onPostExecute(result);

        delegate.processFinish(result.toString());


    }
}

不要使用静态回调。您可以通过实现asyncResponse 或Anonymous 在调用类中实现。并且 processFinish() 实现必须是 public 并带有 @Override
注释。

abstract class trialmenu extends AppCompatActivity implements asyncResponse {
    private ImageView logo;
    private TextView status;
    AsyncStatus asyncTask = new AsyncStatus();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.newmenulayout);
        logo = (ImageView) findViewById(R.id.imglogo);
        status = (TextView) findViewById(R.id.txtStatus);
        asyncTask.setDelegete(this);

    }

    @Override
    public void processFinish(String output) {
        // Callback
    }
}

建议- 关注 naming convention in java使代码更具可读性。