java - 无法在 Recyclerview 上播放视频

Question

我在 RecyclerView 中有一个 VideoView。我想最终有一个视频列表可以在 Recyclerview 上播放。我决定从一个视频开始，然后再制作多个视频。我似乎无法在 Recyclerview 中播放一个视频。当我在手机上启动该应用程序时，我得到的只是进度条。由于某种原因，永远不会调用 onPrepared 函数。这是我的代码。

RecyclerActivity.java

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.view.Menu;
import android.view.MenuItem;
import android.support.v7.widget.RecyclerView;


public class RecyclerActivity extends ActionBarActivity {
  private RecyclerView mRecyclerView;
  private RecyclerView.Adapter mAdapter;
  private RecyclerView.LayoutManager mLayoutManager;


  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_recycler);
    mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
    mRecyclerView.setHasFixedSize(true);
    mLayoutManager = new LinearLayoutManager(this);
    mRecyclerView.setLayoutManager(mLayoutManager);
    mAdapter = new MyAdapter(this);
    mRecyclerView.setAdapter(mAdapter);
  }


  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_recycler, menu);
    return true;
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
  }
}

我的适配器.java

import android.app.ProgressDialog;
import android.content.Context; 
import android.media.MediaPlayer;
import android.net.Uri;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.MediaController;
import android.widget.TextView; 
import android.widget.VideoView;

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
  private Context context;
  private ProgressDialog progressDialog;
  private MediaController mediaControls;
  public static class ViewHolder extends RecyclerView.ViewHolder{
    public VideoView mVideoView;
    public ViewHolder(View v){
        super(v);
        mVideoView = (VideoView) v.findViewById(R.id.video_view);
    }
  }

  public MyAdapter(Context mContext) {
    context = mContext;
    mediaControls = new MediaController(context);
    progressDialog = new ProgressDialog(context);
    progressDialog.setTitle("Random Video");
    progressDialog.setMessage("Loading...");
    progressDialog.setCancelable(false);
    progressDialog.show();
  }

  @Override
  public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.my_video_view, parent,false);
    ViewHolder vh = new ViewHolder(v);
    return vh;
  }

  @Override
  public void onBindViewHolder(final ViewHolder holder, final int position) {
    try{
        holder.mVideoView.setMediaController(mediaControls);
        holder.mVideoView.setVideoURI(Uri.parse("android.resource://" + context.getPackageName() + "/" + R.raw.kitkat));
    } catch (Exception e){
        Log.e("Error", e.getMessage());
        e.printStackTrace();
    }
    holder.mVideoView.requestFocus();
    holder.mVideoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
        @Override
        public void onPrepared(MediaPlayer mp) {
            progressDialog.dismiss();
            holder.mVideoView.start();
        }
    });
  }

  @Override
  public int getItemCount() {
    return 1;
  }

我的视频 View .xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_gravity="center"
    tools:context=".RecyclerActivity">

    <VideoView
        android:id="@+id/video_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"/>
</FrameLayout>

activity_recycler.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".RecyclerActivity">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/my_recycler_view"
        android:scrollbars="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</RelativeLayout>

有什么想法吗？顺便说一下，视频文件是一个 .3gp 文件。谢谢!

Answer 1

我也被困在这个问题上太久了。在到处搜索并仍在苦苦挣扎之后，我查看了我的旧代码库，代码完全相同，只有一个区别。 VideoView 的高度以编程方式设置。 android:layout_height="wrap_content" 似乎没有进行高度调整。

所以我使用了一个自制的实用方法来获取屏幕宽度并将高度设置为 16:9 的比例，就像这样。 (也许只是先将您的高度和宽度设置为一些任意数字，看看是否是问题所在)

public static int getScreenWidth(Context c) {
    int screenWidth = 0; // this is part of the class not the method 
    if (screenWidth == 0) {
        WindowManager wm = (WindowManager) c.getSystemService(Context.WINDOW_SERVICE);
        Display display = wm.getDefaultDisplay();
        Point size = new Point();
        display.getSize(size);
        screenWidth = size.x;
    }

    return screenWidth;
}

然后只需设置 VideoViews 的高度即可

holder.mVideoView.getLayoutParams().height = getScreenWidth(mContext) * 9 /16;

注意:我的宽度设置为 match_parent，因此 wrap_content 也可能在那里失败。

希望这对您有所帮助。