Firebase和picasso在第一次加载时没有加载用户信息

问题描述：

我有一个带有导航抽屉的简单项目，当他们使用Google帐户登录时加载用户名，电子邮件和个人资料图片，这一切都在导航抽屉中设置。我面临的问题是，它不会在用户图片，姓名或电子邮件首次启动应用程序并登录时加载用户图片，姓名或电子邮件，如果关闭应用程序并重新打开该应用程序，则会显示用户信息。我的代码如下：Firebase和picasso在第一次加载时没有加载用户信息

import android.content.Intent; 
import android.net.Uri; 
import android.os.Bundle; 
import android.support.annotation.NonNull; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.util.Log; 
import android.view.View; 
import android.support.design.widget.NavigationView; 
import android.support.v4.view.GravityCompat; 
import android.support.v4.widget.DrawerLayout; 
import android.support.v7.app.ActionBarDrawerToggle; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.widget.ImageView; 
import android.widget.TextView; 

import com.google.firebase.auth.FirebaseAuth; 
import com.google.firebase.auth.FirebaseUser; 
import com.mts2792.swissarmytools.R; 
import com.squareup.picasso.Picasso; 

import model.CircleTransform; 


public class MainActivity extends AppCompatActivity 
     implements NavigationView.OnNavigationItemSelectedListener { 

    private FirebaseAuth mAuth; 
    private FirebaseAuth.AuthStateListener mAuthListener; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
     fab.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) 
         .setAction("Action", null).show(); 
      } 
     }); 

     DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
     ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
       this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close); 
     drawer.setDrawerListener(toggle); 
     toggle.syncState(); 

     NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view); 
     navigationView.setNavigationItemSelectedListener(this); 

     mAuth = FirebaseAuth.getInstance(); 

     FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser(); 

     mAuthListener = new FirebaseAuth.AuthStateListener() { 
      @Override 
      public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) { 
       FirebaseUser user = firebaseAuth.getCurrentUser(); 
       if (user != null) { 
        // User is signed in 
        Log.d("User logged in", "onAuthStateChanged:signed_in:" + user.getUid()); 
       } else { 
        // User is signed out 
        Log.d("User logged out", "onAuthStateChanged:signed_out"); 
       } 
       // ... 
      } 
     }; 

    } 

    @Override 
    public void onBackPressed() { 
     DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
     if (drawer.isDrawerOpen(GravityCompat.START)) { 
      drawer.closeDrawer(GravityCompat.START); 
     } else { 
      super.onBackPressed(); 
     } 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.main, menu); 

     FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser(); 
     if (user != null) { 

      // Name, email address, and profile photo Url 
      String name = user.getDisplayName(); 
      String email = user.getEmail(); 
      Uri photoUrl = user.getPhotoUrl(); 

      // The user's ID, unique to the Firebase project. Do NOT use this value to 
      // authenticate with your backend server, if you have one. Use 
      // FirebaseUser.getToken() instead. 
      String uid = user.getUid(); 

      TextView nameTextView = (TextView) findViewById(R.id.currentUser); 
      TextView emailTextView = (TextView) findViewById(R.id.currentEmail); 
      ImageView currentPic = (ImageView) findViewById(R.id.currentPic); 

      nameTextView.setText(name); 
      emailTextView.setText(email); 

      Picasso.with(this) 
        .load(photoUrl) 
        .resize(175, 175) 
        .placeholder(R.drawable.ic_account) 
        .error(R.drawable.ic_account) 
        .centerCrop() 
        .transform(new CircleTransform()) 
        .into(currentPic); 
//   Picasso.with(this).load(photoUrl).into(currentPic); 

      Log.v("Logged in", name); 
      Log.v("Email: ", email); 

     } 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 

     //noinspection SimplifiableIfStatement 
     if (id == R.id.action_settings) { 
      return true; 
     } 

     return super.onOptionsItemSelected(item); 
    } 

    @SuppressWarnings("StatementWithEmptyBody") 
    @Override 
    public boolean onNavigationItemSelected(MenuItem item) { 
     // Handle navigation view item clicks here. 
     int id = item.getItemId(); 

     if (id == R.id.nav_home) { 
      // Handle the camera action 
     } else if (id == R.id.nav_compass) { 

     } else if (id == R.id.nav_slideshow) { 

     } else if (id == R.id.nav_manage) { 

     } else if (id == R.id.nav_share) { 

     } else if (id == R.id.nav_send) { 

     } 

     DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
     drawer.closeDrawer(GravityCompat.START); 
     return true; 
    } 
}

继承人一些截图显示什么我谈论：第一负载：

你可以试着将占位符直到毕加索从服务器加载实际的图像URL –

@PratikVyas我在那里有一个占位符，但是从服务器加载它没有问题，我可以看到日志中的信息。我的问题是它不会显示在我的textviews或imageview中，直到我重新加载屏幕。 –

为什么你把代码放在onCreateOption菜单上？ –

答

使用抽屉状态变化监听器可能会帮助你，这里是你的代码的精简版，我一直在ActionBarDrawerToggle原样，你可能要更新

public class MainActivity extends AppCompatActivity 
implements NavigationView.OnNavigationItemSelectedListener { 

private FirebaseAuth mAuth; 
FirebaseUser FBuser; 
private FirebaseAuth.AuthStateListener mAuthListener; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 


    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
    this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close); 
    drawer.setDrawerListener(toggle); 
    toggle.syncState(); 

    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view); 
    navigationView.setNavigationItemSelectedListener(this); 

    mAuth = FirebaseAuth.getInstance(); 
    FBuser = FirebaseAuth.getInstance().getCurrentUser(); 

    mAuthListener = new FirebaseAuth.AuthStateListener() { 
    @Override 
    public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) { 
    FBuser = firebaseAuth.getCurrentUser(); 
    fetchUpdateUserData(); 
    if (FBuser != null) { 
    // User is signed in 
    Log.d("User logged in", "onAuthStateChanged:signed_in:" + FBuser.getUid()); 
    } else { 
    // User is signed out 
    Log.d("User logged out", "onAuthStateChanged:signed_out"); 
    } 
    // ... 
    } 
    }; 

    mAuth.addAuthStateListener(mAuthListener) 

} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.main, menu); 

    // Fetch Data if FBuser is not null 
    fetchUpdateUserData(); 

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
    drawer.addDrawerListener(new DrawerLayout.DrawerListener() { 
    @Override 
    public void onDrawerSlide(View drawerView, float slideOffset) {} 

    @Override 
    public void onDrawerOpened(View drawerView) {} 

    @Override 
    public void onDrawerClosed(View drawerView) {} 

    @Override 
    public void onDrawerStateChanged(int newState) { 
    // STATE_IDLE, STATE_DRAGGING or STATE_SETTLING. 
    if (newState == STATE_DRAGGING || newState == STATE_SETTLING) 
    // Fetch Data if FBuser is not null 
    fetchUpdateUserData(); 
    } 
    }); 

    drawer.closeDrawer(GravityCompat.START); 

    return true; 
} 



public void fetchUpdateUserData() { 
    if (FBuser != null) { 

    // Name, email address, and profile photo Url 
    String name = FBuser.getDisplayName(); 
    String email = FBuser.getEmail(); 
    Uri photoUrl = FBuser.getPhotoUrl(); 

    // The FBuser's ID, unique to the Firebase project. Do NOT use this value to 
    // authenticate with your backend server, if you have one. Use 
    // FirebaseUser.getToken() instead. 
    String uid = FBuser.getUid(); 

    TextView nameTextView = (TextView) findViewById(R.id.currentUser); 
    TextView emailTextView = (TextView) findViewById(R.id.currentEmail); 
    ImageView currentPic = (ImageView) findViewById(R.id.currentPic); 

    nameTextView.setText(name); 
    emailTextView.setText(email); 

    Picasso.with(this) 
    .load(photoUrl) 
    .resize(175, 175) 
    .placeholder(R.drawable.ic_account) 
    .error(R.drawable.ic_account) 
    .centerCrop() 
    .transform(new CircleTransform()) 
    .into(currentPic); 
    //   Picasso.with(this).load(photoUrl).into(currentPic); 

    } else { 
    nameTextView.setText(""); 
    emailTextView.setText(""); 
    Picasso.with(this) 
    .load(R.drawable.ic_account) 
    .resize(175, 175) 
    .placeholder(R.drawable.ic_account) 
    .error(R.drawable.ic_account) 
    .centerCrop() 
    .transform(new CircleTransform()) 
    .into(currentPic); 
    } 
} 

}

PS：请在发布前重构代码，并使用Fields，而不是localVariables为DRY (don't repeat yourself)编码

答

：

第二负载后

你好戴维斯在你的代码中试试这个如果有帮助当你的活动冷杉牛逼负荷onCrate方法工作，而从后台来到前台的onResume将工作

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

     getUserDetails(); 

     TextView nameTextView = (TextView) findViewById(R.id.currentUser); 
     TextView emailTextView = (TextView) findViewById(R.id.currentEmail); 
     ImageView currentPic = (ImageView) findViewById(R.id.currentPic); 

     nameTextView.setText(name); 
     emailTextView.setText(email); 

     Picasso.with(this) 
       .load(photoUrl) 
       .resize(175, 175) 
       .placeholder(R.drawable.ic_account) 
       .error(R.drawable.ic_account) 
       .centerCrop() 
       .transform(new CircleTransform()) 
       .into(currentPic); 
    } 

    @Override 
    protected void onResume() { 
     super.onResume(); 
     getUserDetails(); 
    } 

    public void getUserDetails(){ 
     FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser(); 
     if (user != null) { 

      // Name, email address, and profile photo Url 
      name = user.getDisplayName(); 
      email = user.getEmail(); 
      photoUrl = user.getPhotoUrl(); 
      uid = user.getUid(); 
     } 
    }

@米奇戴维斯做到了这一点？ –

我在onCreateOptionsMenu中添加了什么？只是getMenuInflater？ –

在onCreateOptionsMenu注释你的代码段并尝试运行应用程序 –

Firebase和picasso在第一次加载时没有加载用户信息

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