如何解决滑动 ViewPager2 时如何暂停 exoplayer？
我正在将 viewpager2 与 exoplayer、视频（来自 firebase）一起使用。当我在视频中滑动时，视频会继续播放，我必须通过再次滑动到正在播放的视频并单击 exoplayer 暂停按钮来自己停止播放。我希望在我滑动 viewpager2 时视频自动停止。
如何停止视频刷卡？顺便说一句，我对一般的编码甚至在这个网站上都非常陌生，所以我希望得到帮助而不是打扰任何人。
这是我正在实现 viewpager2 的类：
public class Dashboard extends AppCompatActivity {
private static final String TAG = "Dashboard";
private static final int ACTIVITY_NUM = 0;
private static final int CAMERA_PERMISSION_REQUEST_CODE = 88888;
private Context xContext = Dashboard.this;
int likescount;
DatabaseReference likesref;
//uis
ViewPager2 viewPager2;
FirebaseUser firebaseUser;
boolean flag = false;
DatabaseReference likesrefernce = FirebaseDatabase.getInstance().getReference("likes");
Boolean likechecker = false;
String profileid;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.dashboard);
Log.d(TAG,"onCreate: started.");
firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
if (firebaseUser != null) {
firebaseUser.getUid();
}
setupBottomNavigationView();
// getSupportActionBar().setTitle("Videos");
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
viewPager2 = (ViewPager2) findViewById(R.id.vpager);
}
FirebaseRecyclerOptions<video> options =
new FirebaseRecyclerOptions.Builder<video>()
.setQuery(FirebaseDatabase.getInstance().getReference("video"),video.class)
.build();
FirebaseRecyclerAdapter<video,ViewHolder> firebaseRecyclerAdapter =
new FirebaseRecyclerAdapter<video,ViewHolder>(options) {
@Override
protected void onBindViewHolder(@NonNull ViewHolder holder,int position,@NonNull video member) {
SharedPreferences prefs = xContext.getSharedPreferences("PREFS",MODE_PRIVATE);
profileid = prefs.getString("profileid","none");
holder.setExoplayer(getApplication(),member.getName(),member.getVideourl());
FirebaseUser user1 = FirebaseAuth.getInstance().getCurrentUser();
assert user1 != null;
String currentUserId = user1.getUid();
String userId = user1.getUid();
final String i = getRef(position).getKey();
final String publisher = getRef(position).getKey();
DatabaseReference reference3 = FirebaseDatabase.getInstance().getReference("Users").child(member.getPublisher());
reference3.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if (getApplicationContext() == null) {
return;
}
User user3 = dataSnapshot.getValue(User.class);
Glide.with(getApplicationContext()).load(user3 != null ? user3.getImageurl() : null).into(holder.image_profile);
holder.username.setText(user3 != null ? user3.getUsername() : null);
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
likesref = FirebaseDatabase.getInstance().getReference("likes");
String likes = "likes";
likesref.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if (dataSnapshot.child(i).hasChild(userId)) {
likescount = (int) dataSnapshot.child(i).getChildrenCount();
holder.lovers.setImageResource(R.drawable.ic_love2);
holder.lovers_text.setText(Integer.toString(likescount));
} else {
likescount = (int) dataSnapshot.child(i).getChildrenCount();
holder.lovers.setImageResource(R.drawable.ic_love);
holder.lovers_text.setText(Integer.toString(likescount));
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
holder.lovers.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
likechecker = true;
likesrefernce.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if (likechecker.equals(true)) {
if (dataSnapshot.child(i).hasChild(currentUserId)) {
likesrefernce.child(i).child(currentUserId).removeValue();
likechecker = false;
} else {
likesrefernce.child(i).child(currentUserId).setValue(true);
likechecker = false;
}
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
});
holder.comments.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(xContext,CommentsVideos.class);
intent.putExtra("i",i);
xContext.startActivity(intent);
}
});
holder.comments_text.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(xContext,i);
xContext.startActivity(intent);
}
});
holder.image_profile.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
SharedPreferences.Editor editor = xContext.getSharedPreferences("PREFS",MODE_PRIVATE).edit();
editor.putString("profileid",member.getPublisher());
editor.apply();
Intent intent = new Intent(xContext,Profile.class);
xContext.startActivity(intent);
}
});
holder.Notification.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(Dashboard.this,Notifications.class);
startActivity(intent);
}
});
holder.btFullScreen.setOnClickListener(new View.OnClickListener() {
@SuppressLint("UseCompatLoadingForDrawables")
@Override
public void onClick(View view) {
//check condition
if (flag) {
//when flag is true
//set enter full screen image
//set portrait orientation
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT);
BottomNavigationView bottomNavigationView = (BottomNavigationView) findViewById(R.id.bottomNavViewBar);
bottomNavigationView.setVisibility(View.GONE);
flag = false;
} else {
//when flag is false,set exit full screen image
holder.btFullScreen.setImageDrawable(getResources().getDrawable(R.drawable.ic_cross));
//set landscape orientation
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE);
BottomNavigationView bottomNavigationView = (BottomNavigationView) findViewById(R.id.bottomNavViewBar);
bottomNavigationView.setVisibility(View.GONE);
//set flag value is true
flag = true;
}
}
});
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent,int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.syco,parent,false);
return new ViewHolder(view);
}
};
@Override
protected void onStart() {
super.onStart();
firebaseRecyclerAdapter.startListening();
viewPager2.setAdapter(firebaseRecyclerAdapter);
}
@Override
protected void onStop() {
super.onStop();
firebaseRecyclerAdapter.stopListening();
}
/**
* BottomNavigationView setup
*/
private void setupBottomNavigationView () {
Log.d(TAG,"setupBottomNavigationView: setting up BottomNavigationView");
BottomNavigationView bottomNavigationView = (BottomNavigationView) findViewById(R.id.bottomNavViewBar);
BottomNavigationViewHelper.setupBottomNavigationView(bottomNavigationView);
BottomNavigationViewHelper.enableNavigation(xContext,bottomNavigationView);
Menu menu = bottomNavigationView.getMenu();
MenuItem menuItem = menu.getItem(ACTIVITY_NUM);
menuItem.setChecked(true);
}
@Override
protected void onResume () {
super.onResume();
checkPermission();
}
// initializeplayer();
private void checkPermission () {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
return;
}
// request camera permission if it has not been grunted.
if (checkSelfPermission(Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED ||
checkSelfPermission(Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED ||
checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED
) {
requestPermissions(new String[]{Manifest.permission.CAMERA,Manifest.permission.RECORD_AUDIO,Manifest.permission.WRITE_EXTERNAL_STORAGE},CAMERA_PERMISSION_REQUEST_CODE);
}
}
@Override
public void onRequestPermissionsResult ( int requestCode,@NonNull String[] permissions,@NonNull int[] grantResults){
switch (requestCode) {
case CAMERA_PERMISSION_REQUEST_CODE:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(Dashboard.this,"permission has been grunted.",Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(Dashboard.this,"[WARN] permission is not grunted.",Toast.LENGTH_SHORT).show();
}
break;
}
}
}
这是查看器：
public class ViewHolder extends RecyclerView.ViewHolder {
private final Context context = null;
SimpleExoPlayer exoPlayer;
//Initialize variable
PlayerView playerView;
ProgressBar progressBar;
//uis
ImageView comments,lovers,btFullScreen;
private SimpleExoPlayer player;
TextView lovers_text;
TextView comments_text;
TextView username1;
TextView rTitleTv2,Notification,Challenges,username;
CircleImageView image_profile;
private User user2 = new User();
Boolean finished;
DatabaseReference reference1;
int likescount;
int commentscount;
DatabaseReference likesref,postref;
private ViewPager2 ViewPager2;
private OnScrollListener OnScrollListener;
MediaSource renderers;
FirebaseUser firebaseUser;
private Comment comment = new Comment();
private video video = new video();
public ViewHolder(@NonNull View itemView) {
super(itemView);
//uis
image_profile = itemView.findViewById(R.id.image_profile);
username = itemView.findViewById(R.id.username);
comments = itemView.findViewById(R.id.comments);
comments_text = itemView.findViewById(R.id.comments_text);
rTitleTv2 = itemView.findViewById(R.id.rTitleTv2);
Notification = itemView.findViewById(R.id.Notification);
Challenges = itemView.findViewById(R.id.Challenges);
btFullScreen = itemView.findViewById(R.id.bt_fullscreen);
lovers = itemView.findViewById(R.id.lovers);
lovers_text = itemView.findViewById(R.id.lovers_text);
}
public void setExoplayer(Application application,String name,String Videourl){
TextView textView = itemView.findViewById(R.id.rTitleTv2);
playerView = itemView.findViewById(R.id.player_view);
progressBar = itemView.findViewById(R.id.progressBar);
ImageView exo_pause = itemView.findViewById(R.id.exo_pause);
ImageView exo_play = itemView.findViewById(R.id.exo_play);
textView.setText(name);
try {
//Initialize load control
LoadControl loadControl = new DefaultLoadControl();
BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter.Builder(application).build();
TrackSelector trackSelector = new DefaultTrackSelector(new AdaptiveTrackSelection.Factory(bandwidthMeter));
exoPlayer = (SimpleExoPlayer) ExoPlayerFactory.newSimpleInstance(application);
Uri video = Uri.parse(Videourl);
DefaultHttpDataSourceFactory dataSourceFactory = new DefaultHttpDataSourceFactory("video");
ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();
MediaSource mediaSource = new ExtractorMediaSource(video,dataSourceFactory,extractorsFactory,null,null);
playerView.setPlayer(exoPlayer);
//keep screen on
playerView.setKeepScreenOn(true);
exoPlayer.prepare(mediaSource);
exoPlayer.setPlayWhenReady(true);
// ...enable autoplay...
}catch (Exception e){
Log.e("ViewHolder","exoplayer error"+e.toString());
}
if (exoPlayer == null){
exo_pause.setImageDrawable(application.getResources().getDrawable(R.drawable.ic_play));
}
exoPlayer.addListener(new Player.EventListener() {
@Override
public void onTimelineChanged(Timeline timeline,Object manifest,int reason){
}
@Override
public void onTracksChanged(TrackGroupArray trackGroups,TrackSelectionArray trackSelections) {
}
@Override
public void onLoadingChanged(boolean isLoading) {
progressBar.setVisibility(isLoading ? View.VISIBLE : View.GONE);
}
@Override
public void onPlayerStateChanged(boolean playWhenReady,int playbackState) {
if (playbackState == STATE_BUFFERING){
//when buffering show progress bar
progressBar.setVisibility(View.VISIBLE);
} else if (playbackState == STATE_READY){
//when ready hide
progressBar.setVisibility(View.GONE);
exoPlayer.isPlaying();
}
if (playbackState == STATE_ENDED){
//when ready hide
exoPlayer.isPlaying();
exoPlayer.getRepeatMode();
}
}
@Override
public void onRepeatModeChanged(int repeatMode ) {
exo_play.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (exoPlayer != null){
exoPlayer.getRepeatMode();
}
}
});
}
@Override
public void onPlayerError(ExoPlaybackException error) {
}
@Override
public void onPositionDiscontinuity(int reason) {
}
@Override
public void onPlaybackParametersChanged(PlaybackParameters playbackParameters) {
}
@Override
public void onSeekProcessed(){
}
});
}
}
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