java.lang.IllegalStateException：onSaveInstanceState之后无法执行此操作：-片段错误
高弘光
问题内容：
问题答案：
嗨，我用片段A，第二个片段用b。调用了b并使用了asynctask
方法，但是我第一次使用它是完美的，但是第二次使用它使应用程序崩溃，并且我的错误日志在以下:::我使用了Samsung平板电脑，但工作正常，但是Samsung
core mobile崩溃了。
E/AndroidRuntime: FATAL EXCEPTION: main
E/AndroidRuntime: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
E/AndroidRuntime: at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1343)
E/AndroidRuntime: at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1361)
E/AndroidRuntime: at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:595)
E/AndroidRuntime: at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:574)
E/AndroidRuntime: at com.buymysari.fragment.SendImageServerFragment$SendImageServerTask.onPostExecute(SendImageServerFragment.java:158)
E/AndroidRuntime: at com.buymysari.fragment.SendImageServerFragment$SendImageServerTask.onPostExecute(SendImageServerFragment.java:1)
E/AndroidRuntime: at android.os.AsyncTask.finish(AsyncTask.java:631)
E/AndroidRuntime: at android.os.AsyncTask.access$600(AsyncTask.java:177)
E/AndroidRuntime: at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime: at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:4960)
E/AndroidRuntime: at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:511)
E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
E/AndroidRuntime: at dalvik.system.NativeStart.main(Native Method)
我的课程用于：
public class TakeCameraFragment extends Fragment {
Camera mCamera = null;
private CameraPreview mCameraPreview;
protected static final int MEDIA_TYPE_IMAGE = 0;
static String FilePAth = "";
Button takePicture;
static String base64string = "";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View rootView = inflater.inflate(R.layout.camerafragment,
container, false);
mCamera = getCameraInstance();
Log.v("log_tag", "mCamera :: " + mCamera);
mCameraPreview = new CameraPreview(getActivity(), mCamera);
FrameLayout preview = (FrameLayout) rootView
.findViewById(R.id.camera_preview_fragment);
preview.addView(mCameraPreview);
takePicture = (Button) rootView
.findViewById(R.id.btnTakePicturefragment);
takePicture.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
mCamera.takePicture(null, null, mPictureframent);
}
});
return rootView;
}
public boolean checkCameraHardware(Context context) {
if (context.getPackageManager().hasSystemFeature(
PackageManager.FEATURE_CAMERA)) {
// this device has a camera
return true;
} else {
// no camera on this device
return false;
}
}
@Override
public void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
releaseCamera();
}
private void releaseCamera() {
if (mCamera != null) {
mCamera.release(); // release the camera for other applications
mCamera = null;
}
}
private Camera getCameraInstance() {
try {
Log.v("log_tag", "camera try:::" + mCamera);
mCamera = Camera.open();
} catch (Exception e) {
// cannot get camera or does not exist
Log.v("log_tag", "camera catch:::" + mCamera);
releaseCamera();
}
return mCamera;
}
private static File getOutputMediaFile() {
File mediaStorageDir = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
"MyCameraAppFragment");
if (!mediaStorageDir.exists()) {
if (!mediaStorageDir.mkdirs()) {
Log.d("MyCameraApp", "failed to create directory");
return null;
}
}
// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
.format(new Date());
FilePAth = mediaStorageDir.getPath() + File.separator + "IMG_fragment_"
+ timeStamp + ".jpg";
Log.v("log", " FilePAth " + FilePAth);
File mediaFile;
mediaFile = new File(mediaStorageDir.getPath() + File.separator
+ "IMG_fragment_" + timeStamp + ".jpg");
return mediaFile;
}
PictureCallback mPictureframent = new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
File pictureFile = getOutputMediaFile();
if (pictureFile == null) {
return;
}
try {
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
FragmentManager fm = getFragmentManager();
FragmentTransaction fragmentTransaction = fm.beginTransaction();
SetPictureImageFragment fm2 = new SetPictureImageFragment();
fragmentTransaction.replace(R.id.relative_camerafragment_id,
fm2, "HELLO");
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
Bundle bundle = new Bundle();
bundle.putByteArray("position", data);
fm2.setArguments(bundle);
mCamera.startPreview();
} catch (FileNotFoundException e) {
} catch (IOException e) {
}
}
};
}
使用的第二个片段：
public class SetPictureImageFragment extends Fragment {
ImageView img;
Bundle bundle;
byte[] path;
byte[] byteArrayimage;
Button conform;
float x;
Bitmap b;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
View view = inflater.inflate(R.layout.capturepicturefragment, null);
Log.v("log_tag","SetPictureImageFragment");
bundle = this.getArguments();
path = bundle.getByteArray("position");
Log.v("log_tag","SetPictureImageFragment ::: Path :: "+path);
img = (ImageView) view.findViewById(R.id.camera_preview_fragment_imageview);
conform=(Button)view.findViewById(R.id.conform);
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPurgeable = true; // inPurgeable is used to free up
// memory while required
Bitmap b = BitmapFactory.decodeByteArray(path, 0,path.length,options);
int width = b.getWidth();
int height = b.getHeight();
int newWidth = 500;
int newHeight = 500;
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);
int rotation = getActivity().getWindowManager().getDefaultDisplay().getRotation();
int finalDegree = 0;
if(rotation == 0) {
finalDegree = 90;
}
if(rotation == 1) {
finalDegree = 270;
}
if(rotation == 2) {
finalDegree = 180;
}
if(rotation == 3) {
finalDegree = 90;
}
matrix.postRotate(finalDegree);
Bitmap resizedBitmap = Bitmap.createBitmap(b, 0, 0,width, height, matrix, true);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
resizedBitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
byteArrayimage = stream.toByteArray();
img.setScaleType(ScaleType.CENTER);
img.setImageBitmap(resizedBitmap);
conform.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
FragmentManager fm = getChildFragmentManager();
FragmentTransaction fragmentTransaction = fm.beginTransaction();
SendImageServerFragment fm2 = new SendImageServerFragment();
// CreateStoreFragment fm2 = new CreateStoreFragment();
fragmentTransaction.replace(R.id.relative_cameraimageview_fragment, fm2,
"HELLO");
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
Bundle bundle = new Bundle();
bundle.putByteArray("position", byteArrayimage);
fm2.setArguments(bundle);
}
});
return view;
}
}
使用的第三个片段：：：
public class SendImageServerFragment extends Fragment {
SegmentedRadioGroup segmentText;
SegmentedRadioGroupMale segmentTextMale;
Button sendImg;
EditText edt_txt;
MyApplication app;
View view;
Bundle bundle;
byte[] path;
String base64string = "";
Bitmap b;
String cat_id = "";
String gender = "";
private ProgressDialog progress;
InputMethodManager mgr;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll().build();
StrictMode.setThreadPolicy(policy);
}
view = inflater.inflate(R.layout.sendimageserver, null);
// view.setFocusableInTouchMode(true);
// view.requestFocus();
bundle = this.getArguments();
path = bundle.getByteArray("position");
segmentText = (SegmentedRadioGroup) view
.findViewById(R.id.segment_text);
segmentTextMale = (SegmentedRadioGroupMale) view
.findViewById(R.id.segment_text_male);
sendImg = (Button) view.findViewById(R.id.btn_send_image);
edt_txt = (EditText) view.findViewById(R.id.edt_text_store_name);
edt_txt.requestFocus();
mgr = (InputMethodManager) getActivity().getSystemService(
Context.INPUT_METHOD_SERVICE);
mgr.showSoftInput(edt_txt, InputMethodManager.SHOW_IMPLICIT);
app = (MyApplication) getActivity().getApplicationContext();
sendImg.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
int segTxt = segmentText.getCheckedRadioButtonId();
RadioButton radiocatButton = (RadioButton) view
.findViewById(segTxt);
int segmentTextMaleTxt = segmentTextMale
.getCheckedRadioButtonId();
RadioButton radioSexButton = (RadioButton) view
.findViewById(segmentTextMaleTxt);
// b = BitmapFactory.decodeByteArray(path, 0, path.length);
base64string = Base64.encodeToString(path, Base64.DEFAULT);
if (radiocatButton.getText().toString().equals("S")) {
cat_id = "4";
} else if (radiocatButton.getText().toString().equals("C")) {
cat_id = "1";
} else if (radiocatButton.getText().toString().equals("A")) {
cat_id = "5";
}
if (radioSexButton.getText().toString().equals("M")) {
gender = "Male";
} else if (radioSexButton.getText().toString().equals("F")) {
gender = "Female";
}
progress = new ProgressDialog(getActivity());
progress.setMessage("Loading...");
new SendImageServerTask(progress).execute("Home");
}
});
return view;
}
public class SendImageServerTask extends AsyncTask<String, Void, String> {
public SendImageServerTask(ProgressDialog progress) {
progress = progress;
}
public void onPreExecute() {
progress.show();
}
@Override
protected String doInBackground(String... arg) {
String msg = DBAdpter.userUpdateImageStore(app.getStoreId(),
edt_txt.getText().toString(), cat_id, base64string, gender);
Log.v("log_tag", " Msg " + msg);
return msg;
}
@Override
protected void onPostExecute(String result) {
// Create here your JSONObject...
progress.dismiss();
Toast.makeText(getActivity().getApplicationContext(), result,
Toast.LENGTH_LONG).show();
FragmentManager fm = getActivity().getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fm.beginTransaction();
StoreProfileGridFragment fm2 = new StoreProfileGridFragment();
fragmentTransaction.replace(R.id.relative_sendimage_send, fm2,
"HELLO");
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
hideKeybord(edt_txt);
}
}
public void hideKeybord(View view) {
mgr.hideSoftInputFromWindow(view.getWindowToken(),
InputMethodManager.RESULT_UNCHANGED_SHOWN);
}
}
问题答案：
这被称为 状态丢失
。您碰巧从AsyncTask提交FragmentTransaction。框架本身禁止这样做。
如果您可以接受状态丢失和用户意外行为的可能，则可以使用
FragmentTransaction#commitAllowingStateLoss()
代替
FragmentTransaction#commit()
无论如何，请考虑阅读我提供的链接，这是一种非常普遍的情况。
编辑： 此外，有您的问题的解决方法。但是我猜想，这种后果还可能导致状态丢失。尽管如此：
Handler在您的中声明一个Fragment：
private Handler handler = new Handler();
然后，在您onPostExecute(..)执行以下操作：
@Override
protected void onPostExecute(String result) {
progress.dismiss();
Toast.makeText(getActivity().getApplicationContext(), result,
Toast.LENGTH_LONG).show();
handler.post(new Runnable() {
@Override
public void run() {
hideKeybord(edt_txt);
FragmentManager fm = getActivity().getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fm.beginTransaction();
StoreProfileGridFragment fm2 = new StoreProfileGridFragment();
fragmentTransaction.replace(R.id.relative_sendimage_send, fm2,
"HELLO");
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}
});
return;
}
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