我有关于从相机发送图像的问题。当我按下图像按钮时，将应用“openImageIntent（）”功能。一切都有效，直到调用getPath（uri）。当uri被视为空对象时，这会引发错误。这个代码之前正在运行并且现在它崩溃了，这很奇怪。我附加了openImageIntent函数，onResult崩溃的地方和错误。
我将不胜感激任何帮助。提前谢谢。
PS 从图库中附加文件。
private void openImageIntent() {
// Determine Uri of camera image to save.
Log.e("Start","yoyoyo");
final File root = new File(Environment.getExternalStorageDirectory() + File.separator + "Eventime" + File.separator);
root.mkdirs();
final String fname = UUID.randomUUID().toString() + ".png";
final File sdImageMainDirectory = new File(root, fname);
outputFileUri = Uri.fromFile(sdImageMainDirectory);
Log.e("CheckOutput", outputFileUri.toString());
// Camera.
final List<Intent> cameraIntents = new ArrayList<Intent>();
final Intent captureIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
final PackageManager packageManager = getPackageManager();
final List<ResolveInfo> listCam = packageManager.queryIntentActivities(captureIntent, 0);
for(ResolveInfo res : listCam) {
final String packageName = res.activityInfo.packageName;
final Intent intent = new Intent(captureIntent);
intent.setComponent(new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
intent.setPackage(packageName);
Log.e("CheckOutput", outputFileUri.toString());
intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
cameraIntents.add(intent);
}
// Filesystem.
final Intent galleryIntent = new Intent();
galleryIntent.setType("image/*");
galleryIntent.setAction(Intent.ACTION_GET_CONTENT);
// Chooser of filesystem options.
final Intent chooserIntent = Intent.createChooser(galleryIntent, "Select Source");
// Add the camera options.
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, cameraIntents.toArray(new Parcelable[cameraIntents.size()]));
startActivityForResult(chooserIntent, PICTURE_REQUEST_CODE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (check) {
if (resultCode == RESULT_OK) {
if (requestCode == PICTURE_REQUEST_CODE) {
final boolean isCamera;
if (data == null) {
isCamera = true;
} else {
final String action = data.getAction();
if (action == null) {
isCamera = false;
} else {
isCamera = action.equals(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
}
}
Uri uri;
if (isCamera) {
//selectedImageUri
uri = outputFileUri;
} else {
//uri = data.getData();
//selectedImageUri
uri = data == null ? null : data.getData();
}
try {
path = getPath(uri);
// beginUpload(path);
} catch (URISyntaxException e) {
Toast.makeText(this,
"Unable to get the file from the given URI. See error log for details",
Toast.LENGTH_LONG).show();
Log.e("Upload Imagine", "Unable to upload file from the given uri", e);
}
}
}
if (requestCode == 10) {
if (resultCode == RESULT_OK) {
String name = null;
if (data.hasExtra("name")) {
name = data.getStringExtra("name");
}
exit(name);
}
}
check = false;
}
}
错误日志
致命例外：主程序：com.amazon.mysampleapp，PID：12899
java.lang.RuntimeException: Unable to resume activity {com.amazon.mysampleapp/com.mysampleapp.RegisterUser}: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=null} to activity {com.amazon.mysampleapp/com.mysampleapp.RegisterUser}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.List android.net.Uri.getPathSegments()' on a null object reference
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3392)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3423)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2761)
at
Caused by: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=null} to activity {com.amazon.mysampleapp/com.mysampleapp.RegisterUser}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.List android.net.Uri.getPathSegments()' on a null object reference
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1389)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1184)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.List android.net.Uri.getPathSegments()' on a null object reference
at android.provider.DocumentsContract.isDocumentUri(DocumentsContract.java:698)
at com.mysampleapp.RegisterUser.getPath(RegisterUser.java:346)
at com.mysampleapp.RegisterUser.onActivityResult(RegisterUser.java:199)
答案 0 :(得分：0)
我假设outputFileUri是您的活动/片段中此代码所在的字段。如果是这样，您需要确保在onSaveInstanceState() Bundle中加入此内容并将其恢复为onCreate()或onRestoreInstanceState()。当摄像头应用程序位于前台时，您的进程可以终止，因此Uri需要成为正在恢复的状态的一部分。
答案 1 :(得分：0)
或者您可以在outputFileUri内分配onActivityResult的值，因为openImageIntent()中不需要分配。
<强>通过：
final String fname = UUID.randomUUID().toString() + ".png";
final File sdImageMainDirectory = new File(root, fname);
outputFileUri = Uri.fromFile(sdImageMainDirectory);
<强>之前：
uri = outputFileUri;
希望得到这个帮助。