我想让用户设置某个联系人图标,用户可以拍照或从图库中选择一个。我有以下开始活动的结果,注意我在这里处理两个不同,但他们应该处理相同:
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case Constants.TAKE_PHOTO:
if (resultCode == RESULT_OK) {
Uri selectedImage = data.getData();
File file = new File(selectedImage.getPath());
mPhoto = decodeFile(file);
Bitmap croppedImage = cropImage(mPhoto);
Bitmap resized = Bitmap.createScaledBitmap(croppedImage, 100, 100, true);
Bitmap finalPhoto = getRoundedRectBitmap(resized, 100);
imageView.setImageBitmap(finalPhoto);
}
break;
case Constants.CHOOSE_PHOTO:
if (resultCode == RESULT_OK) {
Uri selectedImage = data.getData();
imageView.setImageURI(selectedImage);
}
break;
}
第二种情况,CHOOSE_PHOTO有效。我从图库中选择了一张照片,它放在了ImageView中。问题是,我在第一种情况下创建的方法TAKE_PHOTO很重要,Bitmap被重新整形成一个圆圈并相应地裁剪;对于小尺寸的图片,这完全符合我的要求。主要错误是Out of Memory。我在SO上查看了它,并找到了以下方法来处理这个问题:
private Bitmap decodeFile(File f) {
try {
//Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f), null, o);
//The new size we want to scale to
final int REQUIRED_SIZE = 70;
//Find the correct scale value. It should be the power of 2.
int scale = 1;
while (o.outWidth / scale / 2 >= REQUIRED_SIZE && o.outHeight / scale / 2 >= REQUIRED_SIZE)
scale *= 2;
//Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
} catch (FileNotFoundException e) {
}
return null;
}
我认为这会占用Bitmap尺寸,在将Bitmap加载到内存之前记录内容,然后在加载之前缩放Bitmap,直到完全避免OOM错误。但是,当我运行代码时,应用程序仍然在尝试确认拍摄照片以供选择时崩溃,就像确实发生了OOM错误一样。在崩溃时我有以下Logcat:
07-25 11:01:51.396 13054-13054/com.example.android.home E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=0, result=-1, data=Intent { act=inline-data (has extras) }} to activity {com.example.android.home/com.tabletnanny.ChildSelection}: java.lang.NullPointerException
at android.app.ActivityThread.deliverResults(ActivityThread.java:3322)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3365)
at android.app.ActivityThread.access$1200(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1315)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5059)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.tabletnanny.ChildSelection.onActivityResult(ChildSelection.java:126)
at android.app.Activity.dispatchActivityResult(Activity.java:5242)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3318)
我在几个小时的大部分时间里一直在研究这个问题,但似乎无法弄清楚如何有效地加载Bitmap。我查看了Android Dev网站,他们在这里有一个关于处理大型Bitmaps的有用教程,但他们的解决方案与我在decodeFile
方法中在SO上找到的解决方案非常相似。我在这里缺少什么?
答案 0 :(得分:3)
您可以尝试在ONActivityResult()
中获取位图 Bitmap picture = (Bitmap) data.getExtras().get("data");
ByteArrayOutputStream stream = new ByteArrayOutputStream();
picture.compress(Bitmap.CompressFormat.JPEG, 100, stream);