如何将专辑封面传递给另一个活动

Question

public void accessMetaData(int songIndex)
{
    MediaMetadataRetriever retriver = new MediaMetadataRetriever ();

    retriver.setDataSource(songsList.get(songIndex).get("songPath"));
    showMetaData(retriver);
}
public  void showMetaData(MediaMetadataRetriever retriver)
{
    // Log.i("Script", "METADATA_KEY_ALBUM: " +retriver.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ALBUM));
    // Log.i("Script", "METADATA_KEY_ALBUMARTIST: " +retriver.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ALBUMARTIST));

    byte [] imgBytes = retriver.getEmbeddedPicture();
    Bitmap bitmap ;
    if(imgBytes != null) {
        bitmap = BitmapFactory.decodeByteArray(imgBytes, 0, imgBytes.length);
    ImageView ivImage = (ImageView)findViewById(R.id.ivImage);
        ivImage.setImageBitmap(bitmap); 
    /*  PlayListActivity.ay7aga = (ImageView)findViewById(R.id.widget_album_art);
        ivImage.setImageBitmap(bitmap); */
    }

我有这个代码来获取活动A中的专辑封面，我想将相同的专辑封面传递给活动B，这个代码获取当前播放歌曲的专辑封面

Answer 1

如果我遵循您的问题，那么您可以将图像从一个活动传递到另一个活动。转换您的专辑封面ImageView位图。设置你的ImageView的DrawingCache为true，然后将背景保存为位图，并通过putExtra传递。

 image.setDrawingCacheEnabled(true);
  Bitmap b=image.getDrawingCache();
  Intent i = new Intent(this, nextActivity.class);
  i.putExtra("Bitmap", b);
  startActivity(i);

在你的下一个活动中

Bitmap bitmap = (Bitmap) intent.getParcelableExtra("Bitmap");
imageView.setImageBitmap(bitmap);

Answer 2

 btnPlaylist.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View arg0) {
        /*  Intent i = new Intent(getApplicationContext(), PlayListActivity.class);
            Bitmap bmOriginal = BitmapFactory.decodeResource(getResources(), R.id.ivImage);
            i.putExtra("ha",bmOriginal);
            startActivityForResult(i, 100);  */
            Intent i = new Intent(getApplicationContext(), PlayListActivity.class);
            ivImage.buildDrawingCache();
            Bitmap bitmap =  ivImage.getDrawingCache();
            i.putExtra("BitmapImage", bitmap);

        }
    });
}


/**
 * Receiving song index from playlist view
 * and play the song
 * */
@Override
protected void onActivityResult(int requestCode,
                                 int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(resultCode == 100){
         currentSongIndex = data.getExtras().getInt("songIndex");
         // play selected song
         playSong(currentSongIndex);
    }
}
/**
 * Function to play a song
 * @param songIndex - index of song
 * */
public  void  playSong(int songIndex){
    // Play song
    try {

        mp.reset();
        accessMetaData(songIndex); // here i can show albumart in Activity A
        mp.setDataSource(songsList.get(songIndex).get("songPath"));
        mp.prepare();
        mp.start();
        // Displaying Song title
        String songTitle = songsList.get(songIndex).get("songTitle");
        songTitleLabel.setText(songTitle);
        // Changing Button Image to pause image
        btnPlay.setImageResource(R.drawable.btn_pause);
        // set Progress bar values
        songProgressBar.setProgress(0);
        songProgressBar.setMax(100);
        // Updating progress bar
        updateProgressBar();            
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}





      Activity B
   //      public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.playlist);
    getActionBar().hide();

    ay7aga = (ImageView)findViewById(R.id.widget_album_art);
    Bundle bundle = this.getIntent().getExtras();
     Bitmap bmA = bundle.getParcelable("ha");
     ay7aga.setImageBitmap(bmA); 


 public void accessMetaData(int songIndex)
{
    MediaMetadataRetriever retriver = new MediaMetadataRetriever ();

    retriver.setDataSource(songsList.get(songIndex).get("songPath"));
    showMetaData(retriver);
}
public void showMetaData(MediaMetadataRetriever retriver)
{
    // Log.i("Script", "METADATA_KEY_ALBUM: " +retriver.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ALBUM));
    // Log.i("Script", "METADATA_KEY_ALBUMARTIST: " +retriver.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ALBUMARTIST));

    byte [] imgBytes = retriver.getEmbeddedPicture();
    Bitmap bitmap ;
    if(imgBytes != null) {
        bitmap = BitmapFactory.decodeByteArray(imgBytes, 0, imgBytes.length);
    ImageView ay7aga = (ImageView)findViewById(R.id.widget_album_art);
    ay7aga.setImageBitmap(bitmap);

    }