在安卓中，我成功地播放了视频，但媒体控制器没有显示.下文将进一步说明

Question

>参考： https://google-developer-training.gitbooks.io/android-developer-advanced-course-practicals/unit-5-advanced-graphics-and-views/lesson-13-media/13-1-p-playing-video-with-videoview/13-1-p-playing-video-with-videoview.html

我试图按照参考中的步骤进行操作，但媒体播放器未显示在活动中。那么，我怎样才能摆脱这个问题呢？

onCreate方法：

在这里，我尝试在获得VideoViewid 后添加MediaController

mVideoView = findViewById(R.id.video_view);
if (savedInstanceState != null) {
mCurrentPosition = savedInstanceState.getInt(PLAYBACK_TIME);
}
MediaController mediaController = new MediaController(this);
mediaController.setMediaPlayer(mVideoView);
playing video:

(这里，初始化视频的方法，使用对应的 Uri(

private void initializePlayer() {
Uri videoUri = getMedia(VIDEO_SAMPLE);
mVideoView.setVideoURI(videoUri);
if (mCurrentPosition > 0) {
mVideoView.seekTo(mCurrentPosition);
} else {
// Skipping to 1 shows the first frame of the video.
mVideoView.seekTo(1);
}
mVideoView.start();
}

private Uri getMedia(String mediaName) {
return Uri.parse("android.resource://" + getPackageName() +
"/raw/" + mediaName);
}

Answer 1

你用错了它：

像这样使用，

mVideoView = findViewById(R.id.video_view);
if (savedInstanceState != null) {
mCurrentPosition = savedInstanceState.getInt(PLAYBACK_TIME);
}
MediaController mediaController = new MediaController(this);
mVideoView.setMediaController(mediaController); // Change in this line.

结帐参考 ： 视频视图

Answer 2

package com.example.sagar.videoplay;
import android.net.Uri;
import android.os.Build;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.MediaController;
import android.widget.VideoView;
public class MainActivity extends AppCompatActivity {
private static final String VIDEO_SAMPLE = "demo";
private VideoView mVideoView;
private int mCurrentPosition = 0;
private static final String PLAYBACK_TIME = "play_time";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mVideoView = findViewById(R.id.video_view);
if (savedInstanceState != null) {
mCurrentPosition = savedInstanceState.getInt(PLAYBACK_TIME);
}
MediaController mediaController = new MediaController(this);
mVideoView.setMediaController(mediaController);
}
//its a method which takes string as a input and return a url
private Uri getMedia(String mediaName) {
return Uri.parse("android.resource://" + getPackageName() +
"/raw/" + mediaName);
}
private void initializePlayer() {
Uri videoUri = getMedia(VIDEO_SAMPLE);
mVideoView.setVideoURI(videoUri);
if (mCurrentPosition > 0) {
mVideoView.seekTo(mCurrentPosition);
} else {
// Skipping to 1 shows the first frame of the video.
mVideoView.seekTo(1);
}
mVideoView.start();
}
private void releasePlayer() {
mVideoView.stopPlayback();
}
@Override
protected void onStart() {
super.onStart();
initializePlayer();
}
@Override
protected void onStop() {
super.onStop();
releasePlayer();
}
@Override
protected void onPause() {
super.onPause();
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {
mVideoView.pause();
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt(PLAYBACK_TIME, mVideoView.getCurrentPosition());
}
}