Java Android-在新活动中播放视频
我试图通过将文件URI传递给下一个活动,在另一个活动中播放选定的视频。此时,我点击Java Android-在新活动中播放视频,java,android,media-player,Java,Android,Media Player,我试图通过将文件URI传递给下一个活动,在另一个活动中播放选定的视频。此时,我点击(按钮)findViewById(R.id.pickVid)调用PICK_VIDEO_REQUEST选择视频后,新活动将打开,但屏幕为黑色。我认为fileUri传递不正确,有什么帮助吗 主要活动 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setC
(按钮)findViewById(R.id.pickVid)
调用PICK_VIDEO_REQUEST
选择视频后,新活动将打开,但屏幕为黑色。我认为fileUri传递不正确,有什么帮助吗
主要活动
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button pickVid = (Button) findViewById(R.id.pickVid);
//choose the video
pickVid.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent chooseVideo = new Intent(Intent.ACTION_GET_CONTENT);
chooseVideo.setType("video/*");
startActivityForResult(chooseVideo, PICK_VIDEO_REQUEST);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == PICK_VIDEO_REQUEST) {
if (resultCode == RESULT_OK) {
Uri vidFile = data.getData();
Intent playVid = new Intent(MainActivity.this, PlayVideoAct.class);
playVid.putExtra("vidFile", vidFile);
startActivity(playVid);
}
}
}
电视剧
String mStringFilePath;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_playvideo);
mStringFilePath = getIntent().getStringExtra("vidFile");
}
public void surfaceCreated(SurfaceHolder holder) {
if (this.mPlayer == null) {
this.mPlayer = new MediaPlayer();
} else {
this.mPlayer.reset();
mPlayer.start();
}
try {
FileInputStream paramSurfaceHolder = new FileInputStream(mStringFilePath);
this.mPlayer.setDataSource(paramSurfaceHolder.getFD());
this.mPlayer.setDisplay(this.mSurfaceHolder);
this.mPlayer.prepare();
this.mPlayer.start();
this.mPlayer.pause();
Play();
} catch (Exception e) {
LogUtil.e(e, "Error in PlayVideoAct.surfaceCreate(SurfaceHolder)");
}
}
private void Play() {
mMediaPlayer.start();
if (this.mMediaPlayer.isPlaying()) {
this.mMediaPlayer.pause();
return;
}
if (this.isStop) {
this.mMediaPlayer.seekTo(this.leftPosition);
}
this.mImageViewButtonControls.setImageResource(R.drawable.pause);
}
使用Toast检查mStringFilePath值。我使用了
Toast.makeText(getApplicationContext(),mStringFilePath,Toast.LENGTH_SHORT).show()
而toast是空的?我得到了错误java.lang.ClassCastException:android.net.Uri$HierarchicalUri不能转换为java.lang.String
将该字符串转换为Uri,因为您是在Intent而不是String中传递Uri。您能给我一个示例(代码片段),我使用了mVideoUri=Uri.parse(mStringFilePath)代码>在onCreate内部,现在它崩溃了,说java.lang.NullPointerException:uriString