我使用下面的代码并多次更改以解决问题，因为我在另一个类中使用相同的代码以及app中的其他更改并且它运行良好。但是在一个类中产生错误。
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == RESULT && resultCode == RESULT_OK && data != null){
try {
File dir, file = null;
Boolean save = false;
Bitmap mBitmap;
FileOutputStream fos;
ByteArrayOutputStream bao;
mBitmap = data.getParcelableExtra("data");
dir = eFunction.getStorageDirectory();
if(!dir.exists()){
if(!dir.mkdirs()){
Toast.makeText(ProfilePage.this,
"Please manually create a folder with name DS Images in your sd card",
Toast.LENGTH_SHORT).show();
}
}
try {
bao = new ByteArrayOutputStream();
mBitmap.compress(Bitmap.CompressFormat.JPEG, 100, bao);
file = new File(eFunction.getStorageDirectory().toString() , "Profile_Picture.jpeg");
if(!file.exists()){
save = file.createNewFile();
}else{
file.delete();
save = file.createNewFile();
}
fos = new FileOutputStream(file);
fos.write(bao.toByteArray());
fos.close();
eFunction.refreshGallery(ProfilePage.this, file);
}catch (Exception e){
try{
Toast.makeText(this, ""+e.getMessage(), Toast.LENGTH_SHORT).show();
}catch (Exception ex){
Log.w("DS_142Err", ex);
}
}
if(save){
Toast.makeText(ProfilePage.this, "Profile Picture Successfully Set", Toast.LENGTH_SHORT).show();
Profile_pic.setImageBitmap(BitmapFactory.decodeFile(file.toString()));
}else{
Uri ImageUri = data.getData();
String[] selectedImage = {MediaStore.Images.Media.DATA};
if(ImageUri != null && selectedImage != null) {
Cursor mCursor = getContentResolver().query(ImageUri, selectedImage, null, null, null);
assert mCursor != null;
mCursor.moveToFirst();
String picPath = mCursor.getString(mCursor.getColumnIndex(selectedImage[0]));
if(picPath != null){
mBitmap = BitmapFactory.decodeFile(picPath);
bao = new ByteArrayOutputStream();
mBitmap.compress(Bitmap.CompressFormat.JPEG, 100, bao);
file = new File(eFunction.getStorageDirectory().toString(), "Profile_Picture.jpeg");
if(!file.exists()){
save = file.createNewFile();
}else{
file.delete();
save = file.createNewFile();
}
fos = new FileOutputStream(file);
fos.write(bao.toByteArray());
fos.close();
if(save){
Toast.makeText(ProfilePage.this, "Profile Picture Successfully Set", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(ProfilePage.this, "Error: Profile Picture Not Set", Toast.LENGTH_SHORT).show();
}
Profile_pic.setImageBitmap(BitmapFactory.decodeFile(file.toString()));
}
}
}
}catch (NullPointerException e){
Log.w("DS Profile Error", e);
} catch (FileNotFoundException e) {
Log.w("DS Profile Error", e);
} catch (IOException e) {
Log.w("DS Profile Error", e);
}catch(Exception e) {
Log.w("DS Profile Error", e);
}
}
}
但不幸的是，在某些设备中显示以下错误：
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { dat=content://media/external/images/media/255 typ=vnd.android.cursor.dir/image }} to activity {in.mydiscover.discover_branding/in.mydiscover.discover_branding.ProfilePage}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference
at android.app.ActivityThread.deliverResults(ActivityThread.java:3706)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3749)
at android.app.ActivityThread.access$1400(ActivityThread.java:153)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1400)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5441)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:738)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:628)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference
at in.mydiscover.discover_branding.ProfilePage.onActivityResult(ProfilePage.java:140)
at android.app.Activity.dispatchActivityResult(Activity.java:6508)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3702)
... 9 more
答案 0 :(得分：0)
因为此行返回null
mBitmap = data.getParcelableExtra("data");