我试图通过点击图片浏览来更改个人资料图片，然后我就能裁剪图像然后存储到我的Firebase存储中。但是，添加新图像文件时，程序会停止并且无法单击任何内容。应用程序甚至没有崩溃也没有关闭。当我看到我的安卓监视器时，它会不停地打印出一些东西。我认为这会在某个地方进入某种无限循环。有人认出这个问题吗？
P.S。当我更新新的个人资料图片时，我发现我的Firebase数据库中我的用户下的image子项变化非常快，来回。如果先前的图像是“1”并且图像I更新是“2”，则它变得像1-> 2-> 1-> 2-> 1-> 2 ..就像疯了一样。他们非常快速地互相交换
MyProfileActivity.java
public class MyProfileActivity extends AppCompatActivity
{
/*UI*/
private Toolbar mMyProfileToolbar;
private TextView mAge;
private TextView mGender;
private TextView mReligion;
private TextView mSports;
private TextView mState;
private TextView mTimeRegistered;
private TextView mDisplayName;
private CircleImageView mProfileImage;
/*Firebase*/
private DatabaseReference mDatabaseUser;
private FirebaseUser mUser;
private StorageReference mStorage;
private DatabaseReference mDatabasePost;
private StorageReference filepath;
private DatabaseReference user_db;
/*Other*/
private String age;
private String gender;
private String religion;
private String sports;
private String state;
private String timeRegistered;
private String displayName;
private String image;
private Uri mImageUri = null;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_profile);
/*UI*/
mMyProfileToolbar = (Toolbar)findViewById(R.id.activity_my_profile_toolbar);
mProfileImage = (CircleImageView)findViewById(R.id.activity_my_profile_profile_image);
mDisplayName = (TextView)findViewById(R.id.activity_my_profile_display_name);
mAge = (TextView)findViewById(R.id.activity_my_profile_age);
mGender = (TextView)findViewById(R.id.activity_my_profile_gender);
mReligion = (TextView)findViewById(R.id.activity_my_profile_religion);
mSports = (TextView)findViewById(R.id.activity_my_profile_sports);
mState = (TextView)findViewById(R.id.activity_my_profile_state);
mTimeRegistered = (TextView)findViewById(R.id.activity_my_profile_time_registered);
/*Firebase*/
mDatabaseUser = FirebaseDatabase.getInstance().getReference().child("User");
mUser = FirebaseAuth.getInstance().getCurrentUser();
mStorage = FirebaseStorage.getInstance().getReference();
/*Function*/
setSupportActionBar(mMyProfileToolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setTitle(null);
mDatabaseUser.child(mUser.getUid()).addValueEventListener(new ValueEventListener()
{
@Override
public void onDataChange(DataSnapshot dataSnapshot)
{
displayName = dataSnapshot.child("displayName").getValue().toString();
age = dataSnapshot.child("age").getValue().toString();
gender = dataSnapshot.child("gender").getValue().toString();
religion = dataSnapshot.child("religion").getValue().toString();
sports = dataSnapshot.child("sports").getValue().toString();
state = dataSnapshot.child("state").getValue().toString();
timeRegistered = dataSnapshot.child("timeRegistered").getValue().toString();
image = dataSnapshot.child("image").getValue().toString();
Picasso.with(MyProfileActivity.this).load(image).into(mProfileImage);
mDisplayName.setText(displayName);
mAge.setText("Age: " + age);
mGender.setText("Gender: " + gender);
mReligion.setText("Religion: " + religion);
mSports.setText("Sports: " + sports);
mState.setText("State: " + state);
mTimeRegistered.setText("Time Registered: " + timeRegistered);
}
@Override
public void onCancelled(DatabaseError databaseError)
{
}
});
mProfileImage.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.setType("image/*");
startActivityForResult(i, 1);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == 1 && resultCode == RESULT_OK)
{
mImageUri = data.getData();
CropImage.activity(mImageUri)
.setGuidelines(CropImageView.Guidelines.OFF)
.setAspectRatio(1, 1)
.start(this);
}
if(requestCode == CropImage.CROP_IMAGE_ACTIVITY_REQUEST_CODE)
{
CropImage.ActivityResult result = CropImage.getActivityResult(data);
if(resultCode == RESULT_OK)
{
mImageUri = result.getUri();
mProfileImage.setImageURI(mImageUri);
filepath = mStorage.child(FirebaseAuth.getInstance().getCurrentUser().getUid()).child("Profile_Images").child(mImageUri.getLastPathSegment());
filepath.putFile(mImageUri).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>()
{
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot)
{
final Uri downloadUrl = taskSnapshot.getDownloadUrl();
Toast.makeText(MyProfileActivity.this, "You added picture successfully", Toast.LENGTH_SHORT).show();
mDatabaseUser.child(mUser.getUid()).addValueEventListener(new ValueEventListener()
{
@Override
public void onDataChange(DataSnapshot dataSnapshot)
{
Toast.makeText(MyProfileActivity.this, "Changing picture now", Toast.LENGTH_SHORT).show();
DatabaseReference user_db = mDatabaseUser.child(mUser.getUid());
user_db.child("image").setValue(downloadUrl.toString());
}
@Override
public void onCancelled(DatabaseError databaseError)
{
}
});
}
});
}
else if(resultCode == CropImage.CROP_IMAGE_ACTIVITY_RESULT_ERROR_CODE)
{
Exception error = result.getError();
}
}
}
}
答案 0 :(得分：0)
您的应用正在循环显示如下所示的代码。您向位置mDatabaseUser.child(mUser.getUid())添加了一个侦听器。当该位置的数据发生变化时，onDataChange()会运行并为位置setValue()的子image执行mDatabaseUser.child(mUser.getUid())。虽然您只是更改了该位置的子项，但它被视为对父位置的更改，导致侦听器再次触发，再次设置该值，等等，无休止地。
mDatabaseUser.child(mUser.getUid()).addValueEventListener(new ValueEventListener()
{
@Override
public void onDataChange(DataSnapshot dataSnapshot)
{
Toast.makeText(MyProfileActivity.this, "Changing picture now", Toast.LENGTH_SHORT).show();
DatabaseReference user_db = mDatabaseUser.child(mUser.getUid());
user_db.child("image").setValue(downloadUrl.toString());
}
@Override
public void onCancelled(DatabaseError databaseError)
{
}
});
您在同一位置也有两个侦听器，一个在上面显示，另一个在onCreate()方法中。当位置的任何部分发生变化时，两个听众都会触发。