我有一个问题是Android可以将视频数据加载到VideoView
而不立即开始播放吗?如果是这样,我怎么能这样做?
答案 0 :(得分:15)
我也在考虑像sghael所说的那样表现出一种惊愕。但我认为这可能会导致性能下降。
所以我现在正在做的只是打电话
videoView.seekTo(1);
将视频转发到第一毫秒。这对我来说很好,并且很快实现。
答案 1 :(得分:6)
我还希望我的VideoView在活动开始时处于暂停状态。我找不到一种简单的方法让VideoView显示视频的第一个(非黑色)帧。
作为一种解决方法,我从视频资源中创建了一个位图缩略图,然后将该缩略图作为背景放置在活动开始的VideoView上。然后,当视频开始播放时,您只需要将背景归零(否则您的播放视频会隐藏在背景图像后面)。
Bitmap thumbAsBitmap = null;
BitmapDrawable thumbAsDrawable = null;
private String current;
private void setupVideo() {
try {
setVideoFilePath();
if (current == null || current.length() == 0) {
Toast.makeText(PreviewMessage.this, "File URL/path is empty",
Toast.LENGTH_LONG).show();
} else {
keepScreenOn();
mVideoView.setVideoPath(getDataSource(current));
mVideoView.setOnCompletionListener(this);
// create and place a thumbnail for the start state
thumbAsBitmap = ThumbnailUtils.createVideoThumbnail(current, MediaStore.Images.Thumbnails.MINI_KIND);
thumbAsDrawable = new BitmapDrawable(thumbAsBitmap);
mVideoView.setBackgroundDrawable(thumbAsDrawable);
mVideoView.pause();
isPlaying = false;
}
} catch (Exception e) {
if (mVideoView != null) {
mVideoView.stopPlayback();
}
}
}
然后,无论您的播放按钮是什么,您都可以执行类似
的操作 mPlay.setOnClickListener(new OnClickListener() {
public void onClick(View view) {
if(!isPlaying){
keepScreenOn();
mPlay.setText("Pause");
// make sure to null the background so you can see your video play
mVideoView.setBackgroundDrawable(null);
mVideoView.start();
isPlaying = true;
} else {
mPlay.setText("Play");
mVideoView.pause();
isPlaying = false;
}
}
});
答案 2 :(得分:4)
VideoView
不会自动开始播放,至少如果您附加了MediaController
。您需要致电start()
让它开始播放。因此,如果您不想让它开始播放,请不要拨打start()
。
答案 3 :(得分:0)
我使用MediaController作为播放按钮,因此我使用以下链接答案结合此背景位图作为我的解决方案。
Event for VideoView playback state or MediaController play/pause
答案 4 :(得分:0)
I suggest you for the following Code wherein i am running my application successfully
The Code is as Follows:
XML file:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#f0f0f0" >
<Button
android:id="@+id/btnVideoGallery"
android:layout_width="75dp"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="15dp"
android:text="@string/gallery" />
<Button
android:id="@+id/btnCancel"
android:layout_width="120dp"
android:layout_height="wrap_content"
android:layout_below="@+id/btnVideoGallery"
android:layout_centerHorizontal="true"
android:layout_marginTop="22dp"
android:text="@string/cancel" />
<TextView
android:id="@+id/lblDisplayImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/btnCancel"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
android:text="@string/below_this_text_video_will_be_displayed"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#000000"
android:textSize="13dp" />
<VideoView
android:id="@+id/vvDisplayVideo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/lblDisplayImage"
android:layout_marginTop="15dp" />
</RelativeLayout>
Java File:
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.MediaController;
import android.widget.VideoView;
public class VideoActivity extends Activity {
private Button btnVideoGallery,btnCancel;
private VideoView vvDisplayVideo;
/** The Constant PICK_VIDEO. */
private static final int PICK_VIDEO=1;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_video_options);
btnVideoGallery=(Button)findViewById(R.id.btnVideoGallery);
vvDisplayVideo=(VideoView)findViewById(R.id.vvDisplayVideo);
btnCancel=(Button)findViewById(R.id.btnCancel);
vvDisplayVideo.setVisibility(View.GONE);
btnVideoGallery.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent video=new Intent();
video.setAction(Intent.ACTION_PICK);
video.setType("video/*");
startActivityForResult(video, PICK_VIDEO);
}
});
btnCancel.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent goStartUp=new Intent(VideoActivity.this, StartUpActivity.class);
goStartUp.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(goStartUp);
finish();
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
if (resultCode==Activity.RESULT_OK && requestCode == PICK_VIDEO) {
vvDisplayVideo.setVisibility(View.VISIBLE);
vvDisplayVideo.setVideoURI(data.getData());
vvDisplayVideo.setFocusable(true);
MediaController mc=new MediaController(this);
vvDisplayVideo.setMediaController(mc);
Log.i("True", "Executed");
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
Intent goStartUp=new Intent(VideoActivity.this, StartUpActivity.class);
goStartUp.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(goStartUp);
finish();
return super.onKeyDown(keyCode, event);
}
}
Also you can modify the Manifest File as per your use:
<manifest ...
<uses-sdk... />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.RECORD_VIDEO" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-feature
android:name="android.hardware.camera"
android:required="false" />
<application .....
</application>
</manifest>
答案 5 :(得分:0)
我发现可以通过启动视频,等待1毫秒并暂停:
mediaController = new MediaController(this);
//set the path for video here
Uri video = Uri.parse(tempPath);
//set the VideoView id in xml file here
vv_item = (VideoView) findViewById(R.id.itemdetails_vv_item);
vv_item.setMediaController(mediaController);
vv_item.setVideoURI(video);
vv_item.setOnPreparedListener(new OnPreparedListener() {
public void onPrepared(MediaPlayer mp) {
//first starting the video, when loaded
vv_item.start();
//then waiting for 1 millisecond
try {
Thread.sleep(1);
}
catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//then pausing the video. i guess it's the first frame
vv_item.pause();
//showing the control buttons here
mediaController.show();
}
});
答案 6 :(得分:0)
我发现在所有设备上只显示VideoView.seekTo(n)
并不足以显示视频的第一帧。
如果您需要做的就是显示第一帧,但不播放视频,那么您可以这样做,这有助于渲染视频的缩略图:
MediaMetadataRetriever mediaMetadataRetriever = new MediaMetadataRetriever();
mediaMetadataRetriever.setDataSource(context, uri);
Bitmap firstFrame = MediaMetadataRetriever.getFrameAtTime(0);
// Set firstFrame bitmap to ImageView...
但是,为了在渲染后的某个时刻(例如通过用户交互)想要播放视频的情况下可靠地显示第一帧,我的解决方案是注册OnPreparedListener
,然后调用{{ 1}}。我还注册了start()
,以便在渲染开始时通知我。然后我检查信息是否确实是“渲染开始”事件,并检查这是否是OnInfoListener
第一次开始渲染。如果是,我VideoView
然后pause()
。
这是看起来的样子:
seekTo(0)