在Android中将文件解码为Bitmap抛出异常
可能重复：
Android：将图像加载到Bitmap对象时出现内存不足的问题
我开发了应用程序来将文件解码为位图。 我做了下面的代码，但它总是抛出内存异常
private Bitmap decodeFile(File f) {
Bitmap bmp = null;
FileInputStream fis = null;
try {
// decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inTempStorage = new byte[16*1024];
o.inJustDecodeBounds = true;
o.inPurgeable=true;
//if(!f.exists()) f.createNewFile();
if(!f.exists()) f.createNewFile();
fis = new FileInputStream(f);
BitmapFactory.decodeStream(fis, null, o);
try {
fis.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
fis = null;
// Find the correct scale value. It should be the power of 2.
final int REQUIRED_SIZE = 70;
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp / 2 < REQUIRED_SIZE
|| height_tmp / 2 < REQUIRED_SIZE)
break;
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}
// decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inTempStorage = new byte[16*1024];
o2.inSampleSize = scale;
o2.inPurgeable=true;
o2.inTempStorage = new byte[16*1024];
fis = new FileInputStream(f);
bmp = BitmapFactory.decodeStream(fis);
if (fis != null)
fis.close();
fis = null;
return bmp;
// return BitmapFactory.decodeFile(f.getAbsolutePath(), o2);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
System.gc();
try {
if (fis != null)
fis.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
fis = null;
}
return null;
}
添加了日志猫
12-03 12:03:05.070: E/AndroidRuntime(30696): FATAL EXCEPTION: main
12-03 12:03:05.070: E/AndroidRuntime(30696): java.lang.OutOfMemoryError
12-03 12:03:05.070: E/AndroidRuntime(30696): at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
12-03 12:03:05.070: E/AndroidRuntime(30696): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:527)
12-03 12:03:05.070: E/AndroidRuntime(30696): at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:301)
12-03 12:03:05.070: E/AndroidRuntime(30696): at com.dexterity.iPinion.RootActivity.readFromSDCard(RootActivity.java:1984)
12-03 12:03:05.070: E/AndroidRuntime(30696): at com.dexterity.iPinion.RootActivity.setBrandingImage(RootActivity.java:285)
12-03 12:03:05.070: E/AndroidRuntime(30696): at com.dexterity.iPinion.RootActivity.access$0(RootActivity.java:252)
12-03 12:03:05.070: E/AndroidRuntime(30696): at com.dexterity.iPinion.RootActivity$1.handleMessage(RootActivity.java:515)
12-03 12:03:05.070: E/AndroidRuntime(30696): at android.os.Handler.dispatchMessage(Handler.java:99)
12-03 12:03:05.070: E/AndroidRuntime(30696): at android.os.Looper.loop(Looper.java:137)
12-03 12:03:05.070: E/AndroidRuntime(30696): at android.app.ActivityThread.main(ActivityThread.java:4745)
12-03 12:03:05.070: E/AndroidRuntime(30696): at java.lang.reflect.Method.invokeNative(Native Method)
12-03 12:03:05.070: E/AndroidRuntime(30696): at java.lang.reflect.Method.invoke(Method.java:511)
12-03 12:03:05.070: E/AndroidRuntime(30696): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
12-03 12:03:05.070: E/AndroidRuntime(30696): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
12-03 12:03:05.070: E/AndroidRuntime(30696): at dalvik.system.NativeStart.main(Native Method)
您正在设置BitmapFactory.Options，但您没有将它们传递给您的BitmapFactory.decodeStream。
你有：
BitmapFactory.decodeStream(fis);
应该：
BitmapFactory.decodeStream(fis, o2);
还请阅读Android的显示位图
另外，根据您的设备，您可能只有很少的运行内存。 对于较旧的设备是24MB或更少，大多数新设备是64MB或更多，这一点尤其如此。 你可以检查
Runtime.getRuntime().maxMemory()
另外，您可以通过将“android：largeHeap =”true“'添加到AndroidManifest.xml文件来强制大堆。 在我的Galaxy Nexus上推动我的堆到254MB。
Android内存非常低，约为14MB
要在您的应用中使用位图，请使用此链接，官方android链接使用bitmpas
http://developer.android.com/training/displaying-bitmaps/load-bitmap.html
链接地址: http://www.djcxy.com/p/93089.html上一篇: Decode the file to Bitmap in Android throwing exception
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