android通过BitmapFactory.decodeFile获取图片bitmap报内存溢出的解决办法
原方法：
public static Bitmap getSmallBitmap(String filePath, int reqWidth, int reqHeight) {
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filePath, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeFile(filePath, options);
}
异常：
06-23 11:41:04.817 24959-24959/com.test.tax E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.test.tax, PID: 24959
java.lang.OutOfMemoryError
at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
at android.graphics.BitmapFactory.decodeStreamInternal(BitmapFactory.java:623)
at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:599)
at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:378)
at com.test.tax.utils.PictureUtils.getSmallBitmap(PictureUtils.java:138)
at com.test.tax.utils.PictureUtils.bitmapToFile(PictureUtils.java:58)
at com.test.tax.utils.localalbum.ui.LocalAlbum.onActivityResult(LocalAlbum.java:141)
at android.app.Activity.dispatchActivityResult(Activity.java:5441)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3353)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3400)
at android.app.ActivityThread.access$1300(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1250)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5047)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:609)
at dalvik.system.NativeStart.main(Native Method)
解决办法：
通过设置BitmapFactory.Options属性解决
options.inPreferredConfig = Bitmap.Config.RGB_565;
options.inDither = true;
解决后的方法：
public static Bitmap getSmallBitmap(String filePath, int reqWidth, int reqHeight) {
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filePath, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
//避免出现内存溢出的情况，进行相应的属性设置。
options.inPreferredConfig = Bitmap.Config.RGB_565;
options.inDither = true;
return BitmapFactory.decodeFile(filePath, options);
}