Question

我正在尝试从服务中下载图像并将其显示在活动中，但我一直在

 java binder FAILED BINDER TRANSACTION

这是我的服务代码

public class DownloadImageService extends Service {

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    new LoadImageAsync().execute(intent.getStringExtra("type"));
    return Service.START_NOT_STICKY;
}

@Override
public IBinder onBind(Intent intent) {
    return null;
}

private class LoadImageAsync extends AsyncTask<String, Void, String> {
    byte[] compressedImage;
    Bitmap bmp;
    String img;

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
    }

    @Override
    protected String doInBackground(String... params) {

        try {
            URL url = new URL(imgUrl);
            bmp = BitmapFactory.decodeStream(url.openConnection().getInputStream());
            compressedImage = CompressBitmap.compresssImage(bmp);
            img = Base64.encodeToString(compressedImage, Base64.DEFAULT);

        } catch (IOException e) {
            compressedImage = null;
            bmp = null;
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(String s) {
        super.onPostExecute(s);
        if (compressedImage != null) {
            Intent i = new Intent(getApplicationContext(), OtherCampaignActivity.class);
            i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            i.putExtra("image_byte", img);
            startActivity(i);
        }
        stopService(new Intent(getApplicationContext(), DownloadImageService.class));
    }
}

}

压缩功能

public static byte[] compresssImage(Bitmap b) {
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    b.compress(Bitmap.CompressFormat.PNG, 100, stream);
    byte[] compressedByteArray = stream.toByteArray();
    return compressedByteArray;
}

我的活动

public class OtherActivity extends AppCompatActivity {
private ImageView iv;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_other);
    iv = (ImageView) findViewById(R.id.imageViewCam);
    byte[] byteArray =      Base64.decode(getIntent().getStringExtra("image_byte"), Base64.DEFAULT);
    //        byte[] byteArray = getIntent().getExtras().getByteArray("image_byte");
    Bitmap bitmap = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length);
    iv.setImageBitmap(bitmap);

}

@Override
public void onBackPressed() {
    super.onBackPressed();
    finish();
}
}

代码中存在什么问题。活动没有开始。

该应用没有崩溃。我只在logcat中得到这个：

06-30 12:38:36.800 29992-29992/com.vt.enit E/JavaBinder﹕ !!! FAILED BINDER TRANSACTION !!!

这可能是由于我猜的大位图。

Answer 1

创建图像缓存可以解决我的问题

private LruCache<String, Bitmap> mMemoryCache;

@Override
protected void onCreate(Bundle savedInstanceState) {
...
// Get max available VM memory, exceeding this amount will throw an
// OutOfMemory exception. Stored in kilobytes as LruCache takes an
// int in its constructor.
final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);

// Use 1/8th of the available memory for this memory cache.
final int cacheSize = maxMemory / 8;

mMemoryCache = new LruCache<String, Bitmap>(cacheSize) {
    @Override
    protected int sizeOf(String key, Bitmap bitmap) {
        // The cache size will be measured in kilobytes rather than
        // number of items.
        return bitmap.getByteCount() / 1024;
    }
};
...
}

public void addBitmapToMemoryCache(String key, Bitmap bitmap) {
if (getBitmapFromMemCache(key) == null) {
    mMemoryCache.put(key, bitmap);
}
 }

public Bitmap getBitmapFromMemCache(String key) {
return mMemoryCache.get(key);
}

参考：Caching Bitmaps

Answer 2

它失败了，因为你试图将图像作为额外的意图发送而且它太大了。您无法使用IPC通信技术（如意图或服务/活页夹）发送图像，根据Android的版本，限制为1mb / 10mb。

Android java binder FAILED BINDER TRANSACTION？

2 个答案: