我正在开发一款图片编辑的Android应用程序。在我的一个活动中,我会在 onCreate() 方法中调用一个意图来从相册中选择一张图片,就像这样:
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE);
然后我收到了这样的数据:
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
Crashlytics.log("onActivityResult called");
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PICK_IMAGE && resultCode == Activity.RESULT_OK && data != null) {
Crashlytics.log("Data received from image pick intent");
imageUri = data.getData();
loadImage();
} else {
//if we do not select a picture, go back to the dashboard
Crashlytics.log("Data not received");
onBackPressed();
Log.d(TAG, "no picture selected");
}
}
< p > loadImage
方法:
private void loadImage() {
try {
photoBitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), imageUri);
} catch (IOException e) {
Crashlytics.log("IOException from getBitmap");
Log.d(TAG, e.getMessage());
showToastAndPressBack();
return;
}
if (photoBitmap == null) {
Crashlytics.log("photoBitmap is null in onActivityResult");
showToastAndPressBack();
return;
}
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
imgVWidth = size.x;
int height = size.y;
imgVHeight = (int) (((float) imgVWidth / photoBitmap.getWidth()) * photoBitmap.getHeight());
photoInImgViewBitmap = Bitmap.createScaledBitmap(photoBitmap, imgVWidth, imgVHeight, true);
imageAlreadyPicked = true;
}
现在我的问题是,有时我在Crashlytics中看到NPE-s,提示当用户按下下一个按钮时photoBitmap为 null。
@OnClick(R.id.toolbar_next)
void onToolbarNextClick() {
float originalScale = (float) (previewImageView.getHeight()) / (float) (photoBitmap.getHeight());
...
}
我只看到一个Crashlytics日志,即用户离开意图(我在onPause
中放置了一个Crashlytics日志)。没有onActivityResult
的日志,因此我的最佳猜测是onActivityResult
未被调用,因此我的位图未加载,因此当用户按下下一步时,它将为null。
问题:为什么有时会调用onActivityResult
,有时不会?photoBitmap
为空的其他可能原因有哪些?
photoBitmap==null
。只有这些了! - greenapps