如何从活动返回到先前的片段

时间：2016-12-11 08:55:17

标签： java android android-fragments android-activity

所以这里的情况我有活动A和片段userprofile，当用户点击编辑时，片段被editprofile替换，所以当用户点击图像按钮时，执行下面的代码从库中选择图像。 关闭活动时的问题，它返回片段userprofile。 Activty A不是使用片段editprofile而是使用userprofile恢复的。

使片段容器膨胀的主要活动代码

public class Main extends AppCompatActivity {
//String institudeID;

String institudeID;
Bundle bundle;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    ImageButton profile = (ImageButton) findViewById(R.id.profile);
    profile.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            bundle = new Bundle();
            bundle.putString("id", institudeID);
            UserProfile newFragment = new UserProfile();
            newFragment.setArguments(bundle);
            FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
            //transaction.addToBackStack(null);
            transaction.replace(R.id.fragement_container, newFragment);
            transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
            transaction.commit();
        }
    });

    ImageButton discussion = (ImageButton) findViewById(R.id.discussionthread);
    discussion.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            bundle = new Bundle();
            bundle.putString("id", institudeID);
            Discussion_Main newFragment = new Discussion_Main();
            newFragment.setArguments(bundle);
            FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
            //transaction.addToBackStack(null);
            transaction.replace(R.id.fragement_container, newFragment);
            transaction.commit();
        }
    });

    ImageButton news = (ImageButton) findViewById(R.id.news);
    news.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            bundle = new Bundle();
            bundle.putString("id", institudeID);
            News_Main newFragment = new News_Main();
            newFragment.setArguments(bundle);
            FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
            //transaction.addToBackStack(null);
            transaction.replace(R.id.fragement_container, newFragment);
            transaction.commit();
        }
    });

    ImageButton b1 = (ImageButton) findViewById(R.id.b1);
    bhhooo.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            bundle = new Bundle();
            bundle.putString("id", institudeID);
            BHHOOO_Main newFragment = new BHHOOO_Main();
            newFragment.setArguments(bundle);
            FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
            //transaction.addToBackStack(null);
            transaction.replace(R.id.fragement_container, newFragment);
            transaction.commit();
        }
    });

    ImageButton chat = (ImageButton) findViewById(R.id.chat);
    chat.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            bundle = new Bundle();
            bundle.putString("id", institudeID);
            Chat_Main newFragment = new Chat_Main();
            newFragment.setArguments(bundle);
            FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
            //transaction.addToBackStack(null);
            transaction.replace(R.id.fragement_container, newFragment);
            transaction.commit();
        }
    });
}

@Override
public void onStart(){
    super.onStart();
    institudeID = getIntent().getStringExtra("id");
    //Log.i("LOG", institudeID);


    if(getIntent().hasExtra("register") == true){
        Bundle bundle = new Bundle();
        bundle.putString("id",institudeID);
        bundle.putBoolean("register", true);
        Edit_Profile newFragment = new Edit_Profile();
        newFragment.setArguments(bundle);
        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
        transaction.addToBackStack(null);
        transaction.add(R.id.fragement_container, newFragment);
        transaction.commit();
    }
    else {
        bundle = new Bundle();
        bundle.putString("id", institudeID);
        News_Main newFragment = new News_Main();
        newFragment.setArguments(bundle);
        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
        //transaction.addToBackStack(null);
        transaction.add(R.id.fragement_container, newFragment);
        transaction.commit();
    }
}
@Override
public void onDestroy(){
    super.onDestroy();
}}

从这里当用户按下配置文件按钮时，片段容器用userprofile充气，然后用户可以单击editprfile，用户自己替换userprofile，用户可以选择图像

编辑个人资料的代码

public class Edit_Profile extends Fragment {

com.facebook.Profile userProfile;
EditText editName;
EditText editJob;
EditText editBio;
EditText editEmail;
EditText editPhone;
int SELECT_IMAGE = 1; // global
ImageView profilePicture;
String selectedImagePath;
Bitmap pro_Pic;
File imgFile;
FirebaseStorage storage;
StorageReference storageRef;

String userName;
String job = null;
String bio = null;
String email = null;
String phone = null;
String institudeID;
Bundle bundle;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    bundle = this.getArguments();
    institudeID = bundle.getString("id");

    return inflater.inflate(R.layout.activity_edit_profile, container, false);
}


@Override
public void onStart() {
    super.onStart();

    initialize();

    ImageButton imageButton = (ImageButton) getActivity().findViewById(R.id.editback);
    imageButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            getFragmentManager().popBackStack();
        }
    });

    ImageButton imageButton1 = (ImageButton) getActivity().findViewById(R.id.editaccept);
    imageButton1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            DatabaseReference ref = FirebaseDatabase.getInstance().getReference().child(institudeID).child("User")
                    .child(userProfile.getId().toString());
            User user = new User(editName.getText().toString(), editJob.getText().toString(), editBio.getText().toString()
                    , "Profile/P" + userProfile.getId().toString() + ".jpg", editEmail.getText().toString()
                    , editPhone.getText().toString());
            ref.setValue(user);

            uploadImage();
        }
    });

    ImageView pic = (ImageView) getActivity().findViewById(R.id.profilePic);
    pic.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent();
            intent.setType("image/*");
            intent.setAction(Intent.ACTION_GET_CONTENT);
            startActivityForResult(Intent.createChooser(intent, "Select Picture"),SELECT_IMAGE);
        }
    });

}

@Override
public void onPrepareOptionsMenu(Menu menu) {
    menu.clear();
}

public void initialize(){
    userProfile = com.facebook.Profile.getCurrentProfile();

    //selectedImagePath = "https://graph.facebook.com/" + userProfile.getId() + "/picture?type=large";

    profilePicture = (ImageView) getActivity().findViewById(R.id.profilePic);
    editName = (EditText) getActivity().findViewById(R.id.editName);
    editJob = (EditText) getActivity().findViewById(R.id.editJob);
    editBio = (EditText) getActivity().findViewById(R.id.editBio);
    editEmail = (EditText) getActivity().findViewById(R.id.editEmail);
    editPhone = (EditText) getActivity().findViewById(R.id.editPhone);


    storage = FirebaseStorage.getInstance();
    storageRef = storage.getReferenceFromUrl("gs://thread-4cc4e.appspot.com");

    if(bundle.getBoolean("register", false)){
        Picasso.with(getActivity().getApplicationContext())
                .load("https://graph.facebook.com/" + userProfile.getId() + "/picture?type=large")
                .transform(new CropCircleTransformation())
                .into(profilePicture);
    }else{
        retrieveProfile();
    }
}

public void retrieveProfile(){
    DatabaseReference ref = FirebaseDatabase.getInstance().getReference().child(institudeID).child("User")
            .child(Profile.getCurrentProfile().getId().toString());
    ValueEventListener valueEventListener = new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            User user = dataSnapshot.getValue(User.class);
            userName = user.getName();
            job = user.getJob();
            bio = user.getBio();
            email = user.getEmail();
            phone = user.getPhoneNo();
            editName.setText(userName);
            editJob.setText(job);
            editBio.setText(bio);
            editEmail.setText(email);
            editPhone.setText(phone);

            downloadImage();
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    };
    ref.addListenerForSingleValueEvent(valueEventListener);


}

public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode == RESULT_OK) {
        if (requestCode == SELECT_IMAGE) {
            Uri selectedImageUri = data.getData();
            selectedImagePath = getPath(selectedImageUri);
            System.out.println("Image Path : " + selectedImagePath);
            Picasso.with(getActivity().getApplicationContext())
                    .load(selectedImageUri)
                    .transform(new CropCircleTransformation())
                    .into(profilePicture);
        }
    }
}

public String getPath(Uri uri) {
    String[] projection = { MediaStore.Images.Media.DATA };
    Cursor cursor = getActivity().managedQuery(uri, projection, null, null, null);
    int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
    cursor.moveToFirst();
    return cursor.getString(column_index);
}


public void uploadImage(){
    StorageReference profileImagesRef = storageRef.child("Profile/P" + userProfile.getId().toString() + ".jpg");

    profilePicture.setDrawingCacheEnabled(true);
    profilePicture.buildDrawingCache();
    Bitmap bitmap = profilePicture.getDrawingCache();
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
    byte[] data = baos.toByteArray();

    UploadTask uploadTask = profileImagesRef.putBytes(data);
    uploadTask.addOnFailureListener(new OnFailureListener() {
        @Override
        public void onFailure(@NonNull Exception exception) {
        }
    }).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
        @Override
        public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
            Uri downloadUrl = taskSnapshot.getDownloadUrl();
        }
    });
}

void downloadImage(){
    StorageReference gsReference = storage.getReferenceFromUrl("gs://thread-4cc4e.appspot.com/Profile/P"
            + userProfile.getId().toString() + ".jpg");

    gsReference.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
        @Override
        public void onSuccess(Uri uri) {
            Picasso.with(getActivity().getApplicationContext())
                    .load(uri)
                    .transform(new CropCircleTransformation())
                    .resize(400, 400)
                    .into(profilePicture);
        }
    }).addOnFailureListener(new OnFailureListener() {
        @Override
        public void onFailure(@NonNull Exception exception) {
        }
    });
}}

2 个答案:

答案 0 :(得分：1)

从点击侦听器中删除startActivity(intent);。 startActivityForResult(Intent.createChooser(intent, "Select Picture"),SELECT_IMAGE);用于开始活动并在onActivityResult()中获取结果。您无需再次致电startActivity()。

 discPicture.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setType("image/*");
                intent.setAction(Intent.ACTION_GET_CONTENT);
                startActivityForResult(Intent.createChooser(intent, "Select Picture"),SELECT_IMAGE);
               // **startActivity(intent);**
            }
        });

我已经检查了您的代码，您正在使用OnStart()方法进行片段转换。因此，当您的控件从图库返回时，再次调用onStart()。

请在onCreate()中写下您的Fragmnet替换逻辑，或者为onStart()逻辑维护布尔值。

当您的控制权返回应用程序时，会调用这些活动生命周期方法

  onRestart() --> onStart() --> onResume()

OnCreate() call only once, so do your code here  for fragment replace

答案 1 :(得分：0)

我认为问题出在这里

startActivityForResult（Intent.createChooser（intent，＆＃34; Select Picture＆＃34;），SELECT_IMAGE）;             startActivity（意向）;

您正在同时调用startActivityForResult和startActivity。使用ONly startActivityForResult。

并在＆＃34; onActivityResult＆＃34;上进行更改并在代码中包含super.onActivityResult（requestCode，resultCode，data），然后尝试它是否适合您

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