java - Glide - 应用程序因另一个 Activity 中的上下文错误而崩溃

Question

我在使用 Glide 时遇到问题。这个问题是这样发生的:

我转到我的个人资料页面，然后单击后退按钮，然后在 Firebase 数据库中插入一个对象(现在应用崩溃了)。问题出在我的 UserProfile Activity 中，但我不知道如何解决此问题。我读过两篇类似的文章，但不太明白。 ( Glide error after activity was destroyed and restarted 和 Glide image loading with application context )

我的logcat是这样的:

java.lang.IllegalArgumentException: You cannot start a load for a destroyed activity
                                                                           at com.bumptech.glide.manager.RequestManagerRetriever.assertNotDestroyed(RequestManagerRetriever.java:134)
                                                                           at com.bumptech.glide.manager.RequestManagerRetriever.get(RequestManagerRetriever.java:102)
                                                                           at com.bumptech.glide.manager.RequestManagerRetriever.get(RequestManagerRetriever.java:87)
                                                                           at com.bumptech.glide.Glide.with(Glide.java:629)
                                                                           at gamingproject.sellmybooks.UserProfile.getUserData(UserProfile.java:114)
                                                                           at gamingproject.sellmybooks.UserProfile.access$000(UserProfile.java:39)
                                                                           at gamingproject.sellmybooks.UserProfile$1.onDataChange(UserProfile.java:75)
                                                                           at com.google.android.gms.internal.zzaie.zza(Unknown Source)
                                                                           at com.google.android.gms.internal.zzaje.zzcta(Unknown Source)
                                                                           at com.google.android.gms.internal.zzajh$1.run(Unknown Source)
                                                                           at android.os.Handler.handleCallback(Handler.java:739)
                                                                           at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                           at android.os.Looper.loop(Looper.java:135)
                                                                           at android.app.ActivityThread.main(ActivityThread.java:5608)
                                                                           at java.lang.reflect.Method.invoke(Native Method)
                                                                           at java.lang.reflect.Method.invoke(Method.java:372)
                                                                           at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1397)
                                                                           at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1192)

配置文件类别:

public class UserProfile extends AppCompatActivity {

Context mContext;
ImageView userProfileImage;
TextView name, mail, user_location_textView;
String tag_login;
String user_name, user_mail, user_token, user_urlPicture, user_location, user_key;
String TAG_LOGIN = "TAG_LOGIN";
String KEY = "KEY";
int REQUEST_IMAGE_CAPTURE;
DatabaseReference users;

@TargetApi(Build.VERSION_CODES.KITKAT)
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(layout.activity_user_profile);
    getSupportActionBar().hide();

    mContext = this;

    userProfileImage = (ImageView) findViewById(R.id.imageProfile);
    name = (TextView) findViewById(R.id.name);
    mail = (TextView) findViewById(R.id.mail);
    user_location_textView = (TextView) findViewById(R.id.user_location);

    Intent intent = getIntent();
    tag_login = intent.getStringExtra(TAG_LOGIN);
    user_key = intent.getStringExtra(KEY);

    users = FirebaseDatabase.getInstance().getReference("Users").child("User" + tag_login).child(user_key);

    users.addValueEventListener(new ValueEventListener() {
        @RequiresApi(api = Build.VERSION_CODES.KITKAT)
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            getUserData(dataSnapshot);
        }
        @Override
        public void onCancelled(DatabaseError databaseError) {
        }
    });

}


///Get user's data with the key///

@TargetApi(Build.VERSION_CODES.KITKAT)
@RequiresApi(api = Build.VERSION_CODES.KITKAT)
private void getUserData(DataSnapshot dataSnapshot){
     if (Objects.equals(tag_login, "App")){
        UserApp userApp = dataSnapshot.getValue(UserApp.class);
        user_name = userApp.user_name;
        user_mail = userApp.user_mail;
        user_token = userApp.user_token;
        user_location = userApp.user_location;
        user_urlPicture = userApp.user_bitmapImage;
        name.setText(user_name);
        mail.setText(user_mail);
        user_location_textView.setText(user_location);
        if (Objects.equals(user_urlPicture, "NoImage")){
            userProfileImage.setImageResource(drawable.noimage);
            Toast.makeText(mContext, "Click on image to change it", Toast.LENGTH_LONG).show();
        } else {
            Glide.with(mContext).load(user_urlPicture).into(userProfileImage);
        }
        userProfileImage.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
                    REQUEST_IMAGE_CAPTURE = 1;
                    startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
                }
                return false;
            }
        });


    }

}

感谢您的帮助

Answer 1

您应该在 onDestroy Activity 期间删除值更改监听器。

类似这样的事情:

// during onCreate(Bundle)
users.addValueEventListener(listener);

// then during onDestroy()
users.removeValueEventListener(listener);

// outside any method you write the listener
private ValueEventListener listener = new ValueEventListener() {
        @RequiresApi(api = Build.VERSION_CODES.KITKAT)
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            getUserData(dataSnapshot);
        }
        @Override
        public void onCancelled(DatabaseError databaseError) {
        }
    }