【发布时间】：2016-08-23 13:54:18
【问题描述】：
所以我的应用中有一个通知。通知有一些文本和一个图像，我从一开始填充的 LruCache 中获取。问题是，在我的情况下，在 Kit-Kat 设备（Moto E，XIomi）上，如果通知已经更新了固定次数，则通知停止更新，比如说 n（这个 n 通常是固定的对于每个设备，并且
String title = CommonUtils.getTitleFromID(id, context);
Bitmap bitmap = DataProvider.getInstance(context).diskLruImageCache.getBitmap(id + "");
if (playbackPaused) {
bigView.setImageViewResource(R.id.pause, R.drawable.pause_noti);
smallView.setImageViewResource(R.id.pause1, R.drawable.pause_noti);
remoteViews.setImageViewResource(R.id.pause2, R.drawable.pause_noti);
playbackPaused = false;
Log.d(TAG, "noti-false");
}
bigView.setTextViewText(R.id.title, title + "");
bigView.setImageViewBitmap(R.id.img, bitmap);
smallView.setTextViewText(R.id.title1, title);
smallView.setImageViewBitmap(R.id.img1, bitmap);
mNotificationManager.notify(NOTIFY_ID, notification);
我尝试了一些调试，我发现如果我不设置位图，（只做bitmap = null）那么一切正常。
我不明白为什么会这样。这个问题是特定于 android 版本的，因为我已经在 Nexus 5 (Lollipop) 和其他 Android 5 手机上进行了测试，但没有发生这种情况。有人知道这背后的原因是什么吗？
我并不期待确切的情况。即使是一些正确方向的想法也会很有帮助。谢谢！！
我还在为我的 DiskLruCache 添加代码以备不时之需，
public class DiskLruImageCache {
private DiskLruCache mDiskCache;
private Bitmap.CompressFormat mCompressFormat = Bitmap.CompressFormat.JPEG;
private int mCompressQuality = 70;
private static final int APP_VERSION = 1;
private static final int VALUE_COUNT = 1;
private static final String TAG = "DiskLruImageCache";
public DiskLruImageCache( Context context,String uniqueName, int diskCacheSize,
Bitmap.CompressFormat compressFormat, int quality ) {
try {
final File diskCacheDir = getDiskCacheDir(context, uniqueName );
mDiskCache = DiskLruCache.open( diskCacheDir, APP_VERSION, VALUE_COUNT, diskCacheSize );
mCompressFormat = compressFormat;
mCompressQuality = quality;
} catch (IOException e) {
e.printStackTrace();
}
}
private boolean writeBitmapToFile( Bitmap bitmap, DiskLruCache.Editor editor )
throws IOException {
OutputStream out = null;
try {
out = new BufferedOutputStream( editor.newOutputStream( 0 ), Utils.IO_BUFFER_SIZE );
return bitmap.compress( mCompressFormat, mCompressQuality, out );
} finally {
if ( out != null ) {
out.close();
}
}
}
private boolean writeUriToFile( Uri bitmap, DiskLruCache.Editor editor )
throws IOException, FileNotFoundException {
OutputStream out = null;
try {
out = new BufferedOutputStream( editor.newOutputStream( 0 ), Utils.IO_BUFFER_SIZE );
return true;
} finally {
if ( out != null ) {
out.close();
}
}
}
private File getDiskCacheDir(Context context, String uniqueName) {
// Check if media is mounted or storage is built-in, if so, try and use external cache dir
// otherwise use internal cache dir
final String cachePath =
Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()) ||
!Utils.isExternalStorageRemovable() ?
Utils.getExternalCacheDir(context).getPath() :
context.getCacheDir().getPath();
return new File(cachePath + File.separator + uniqueName);
}
public void put( String key, Bitmap data ) {
DiskLruCache.Editor editor = null;
try {
editor = mDiskCache.edit( key );
if ( editor == null ) {
return;
}
if( writeBitmapToFile( data, editor ) ) {
mDiskCache.flush();
editor.commit();
if ( BuildConfig.DEBUG ) {
Log.d( "cache_test_DISK_", "image put on disk cache " + key );
}
} else {
editor.abort();
if ( BuildConfig.DEBUG ) {
Log.d( "cache_test_DISK_", "ERROR on: image put on disk cache " + key );
}
}
} catch (IOException e) {
if ( BuildConfig.DEBUG ) {
Log.d( "cache_test_DISK_", "ERROR on: image put on disk cache " + key );
}
try {
if ( editor != null ) {
editor.abort();
}
} catch (IOException ignored) {
}
}
}
public void put( String key, Uri data ) {
DiskLruCache.Editor editor = null;
try {
editor = mDiskCache.edit( key );
if ( editor == null ) {
return;
}
if( writeUriToFile( data, editor ) ) {
mDiskCache.flush();
editor.commit();
if ( BuildConfig.DEBUG ) {
Log.d( "cache_test_DISK_", "image put on disk cache " + key );
}
} else {
editor.abort();
if ( BuildConfig.DEBUG ) {
Log.d( "cache_test_DISK_", "ERROR on: image put on disk cache " + key );
}
}
} catch (IOException e) {
if ( BuildConfig.DEBUG ) {
Log.d( "cache_test_DISK_", "ERROR on: image put on disk cache " + key );
}
try {
if ( editor != null ) {
editor.abort();
}
} catch (IOException ignored) {
}
}
}
public synchronized Bitmap getBitmap( String key ) {
Bitmap bitmap = null;
DiskLruCache.Snapshot snapshot = null;
try {
snapshot = mDiskCache.get( key );
if ( snapshot == null ) {
return null;
}
final InputStream in = snapshot.getInputStream( 0 );
if ( in != null ) {
final BufferedInputStream buffIn =
new BufferedInputStream( in, Utils.IO_BUFFER_SIZE );
bitmap = BitmapFactory.decodeStream(buffIn);
}
} catch ( IOException e ) {
e.printStackTrace();
} finally {
if ( snapshot != null ) {
snapshot.close();
}
}
if ( BuildConfig.DEBUG ) {
Log.d( "cache_test_DISK_", bitmap == null ? "" : "image read from disk " + key);
}
return bitmap;
}
public boolean containsKey( String key ) {
boolean contained = false;
DiskLruCache.Snapshot snapshot = null;
try {
snapshot = mDiskCache.get( key );
contained = snapshot != null;
} catch (IOException e) {
e.printStackTrace();
} finally {
if ( snapshot != null ) {
snapshot.close();
}
}
return contained;
}
public boolean removeKey( String key ) {
boolean removed=false;
DiskLruCache.Snapshot snapshot = null;
try {
removed = mDiskCache.remove( key );
} catch (IOException e) {
e.printStackTrace();
} finally {
if ( snapshot != null ) {
snapshot.close();
}
}
return removed;
}
public void clearCache() {
if ( BuildConfig.DEBUG ) {
Log.d("cache_test_DISK_", "disk cache CLEARED");
}
try {
mDiskCache.delete();
} catch ( IOException e ) {
e.printStackTrace();
}
}
public File getCacheFolder() {
return mDiskCache.getDirectory();
}
}
【问题讨论】：
-
只是对您的代码的观察和可能的原因：您没有释放位图，它可能会因表面内存而崩溃。你有关于这个问题的任何痕迹吗？？
-
@eduyayo 嘿，谢谢您的回复，我没有注意到任何明显的痕迹。但是我应该在哪里以及如何释放位图，这个问题对我来说真的很重要，但我无法解决它。你能建议改变吗？谢谢！！
-
在“使用”之后，您应该致电
bitmap.recycle()。我建议您在设置新的之前保留对以前使用的参考并回收... -
顺便说一句！
writeBitmapToFile当你预处理并保存任何位图时，千万不要在没有回收的情况下丢失东西！！ -
@eduyayo 如果我回收位图，我会收到错误无法在 mNotificationManager.notify(NOTIFY_ID,musicNotification); 行打包回收的位图； :( 当我试图解决这个问题时，我也遇到了这个错误。
标签： android android-notifications