Question

我正在使用recyclelerview，其中包含 TextView（progresstxt）和Progressbar（downloadprogress）作为夸大项目的一部分。

我需要知道如何从IntentService访问SimpleAdapter中的TextView和Progressbar，以便我可以更新它们的值？

我正在尝试使用 BroadcastReceiver 来实现这一点，但它不起作用，TextView和Progressbar没有更新。

提前谢谢。

我通过onBindViewHolder访问TextView和Progressbar。

java.lang.ClassCastException: android.widget.RelativeLayout$LayoutParams cannot be cast to android.widget.AbsListView$LayoutParams
       at android.widget.ListView.setupChild(ListView.java:1888)
       at android.widget.ListView.makeAndAddView(ListView.java:1857)
       at android.widget.ListView.fillDown(ListView.java:682)
       at android.widget.ListView.fillFromTop(ListView.java:748)
       at android.widget.ListView.layoutChildren(ListView.java:1653)
       at android.widget.AbsListView.onLayout(AbsListView.java:2447)
       at android.view.View.layout(View.java:15204)
       at android.view.ViewGroup.layout(ViewGroup.java:4793)
       at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1677)
       at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1531)
       at android.widget.LinearLayout.onLayout(LinearLayout.java:1440)
       at android.view.View.layout(View.java:15204)
       at android.view.ViewGroup.layout(ViewGroup.java:4793)
       at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1076)
       at android.view.View.layout(View.java:15204)
       at android.view.ViewGroup.layout(ViewGroup.java:4793)
       at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
       at android.widget.ScrollView.onLayout(ScrollView.java:2144)
       at android.view.View.layout(View.java:15204)
       at android.view.ViewGroup.layout(ViewGroup.java:4793)
       at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1677)
       at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1531)
       at android.widget.LinearLayout.onLayout(LinearLayout.java:1440)
       at android.view.View.layout(View.java:15204)
       at android.view.ViewGroup.layout(ViewGroup.java:4793)
       at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
       at android.view.View.layout(View.java:15204)
       at android.view.ViewGroup.layout(ViewGroup.java:4793)
       at com.android.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:349)
       at android.view.View.layout(View.java:15204)
       at android.view.ViewGroup.layout(ViewGroup.java:4793)
       at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
       at android.view.View.layout(View.java:15204)
       at android.view.ViewGroup.layout(ViewGroup.java:4793)
       at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2260)
       at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2007)
       at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1249)
       at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6364)
       at android.view.Choreographer$CallbackRecord.run(Choreographer.java:791)
       at android.view.Choreographer.doCallbacks(Choreographer.java:591)
       at android.view.Choreographer.doFrame(Choreographer.java:561)
       at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:777)
       at android.os.Handler.handleCallback(Handler.java:730)
       at android.os.Handler.dispatchMessage(Handler.java:92)
       at android.os.Looper.loop(Looper.java:176)
       at android.app.ActivityThread.main(ActivityThread.java:5419)
       at java.lang.reflect.Method.invokeNative(Native Method)
       at java.lang.reflect.Method.invoke(Method.java:525)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
       at dalvik.system.NativeStart.main(Native Method)

通过 IntentService（MoService）完成了几个文件操作，我想从此IntentService 访问/更新 TextView和Progressbar。

public class SimpleAdapter extends RecyclerView.Adapter<SimpleAdapter.SimpleViewHolder> implements FollowRedirectsCallback {

private final Context mContext;
private String recievedStr;
private int receivedProg;

private MyBroadcastReceiver myBroadcastReceiver;
private MyBroadcastReceiver_Update myBroadcastReceiver_Update;

public static class SimpleViewHolder extends RecyclerView.ViewHolder {
        public final TextView title, progresstxt;
        public ProgressBar downloadprogress;

        public SimpleViewHolder(View view) {
            super(view);
            title = (TextView) view.findViewById(R.id.simple_text);
            progresstxt = (TextView) view.findViewById(R.id.progress_text);
            downloadprogress = (ProgressBar) view.findViewById(R.id.progressdownload);
        }
    ...
public class MyBroadcastReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
            recievedStr = intent.getStringExtra(MoService.EXTRA_KEY_UPDATE);
            //progresstxt.setText(result); ?
            //how to access the TextView in onBindViewHolder?
        }
    }

public class MyBroadcastReceiver_Update extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        receivedProg = intent.getIntExtra(MoService.EXTRA_KEY_UPDATE_PROGRESS, 0);
        //downloadprogress.setProgress(update); ?
        //how to access the Progressbar in onBindViewHolder?

    }
}

...

@Override
    public void onBindViewHolder(final SimpleViewHolder holder, final int position) {
      //
        myBroadcastReceiver = new MyBroadcastReceiver();
        myBroadcastReceiver_Update = new MyBroadcastReceiver_Update();

        //register BroadcastReceiver
        IntentFilter intentFilter = new IntentFilter(MoService.ACTION_MyIntentService);
        intentFilter.addCategory(Intent.CATEGORY_DEFAULT);
        mContext.registerReceiver(myBroadcastReceiver, intentFilter);

        IntentFilter intentFilter_update = new IntentFilter(MoService.ACTION_MyUpdate);
        intentFilter_update.addCategory(Intent.CATEGORY_DEFAULT);
        mContext.registerReceiver(myBroadcastReceiver_Update, intentFilter_update);

      //
        holder.progresstxt.setText(recievedStr);
        holder.downloadprogress.setProgress(receivedProg);
        holder.progresstxt.setVisibility(View.VISIBLE);
        holder.downloadprogress.setVisibility(View.VISIBLE);

      //
    }

    mContext.unregisterReceiver(myBroadcastReceiver);
    mContext.unregisterReceiver(myBroadcastReceiver_Update);
}

Answer 1

There are a couple of issues with the code. You should not create a new Receiver in your onBindViewHolder method. There should be a single receiver which updates the Item list used by your adapter and call notifyDataSetChanged on the adapter.

Hope it helps

从IntentService访问Recyclerview中的TextView和Progressbar

1 个答案: