操作栏崩溃应用的后退按钮android

-5

Synposis：我有3个活动（LoginActivity，MainActivity和EditProfileActivity）。在Facebook登录我的LoginActivity之后，我将创建MainActivity。（直到这一点，该应用程序正常工作正确无误）。我有一个NavigationDrawer用于导航，当我从NavigationDrawer中点击Edit Profile链接时，它启动EditProfileActivity。操作栏崩溃应用的后退按钮android

问题：当我点击顶部蓝色栏中的左箭头时，应用程序崩溃。

请看图片：

MainActivity

抽屉式导航

EditProfileActivity

应用程序崩溃的点击左上角的箭头

这里是我的Manifest.xml

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.example.example"> 

    <uses-permission android:name="android.permission.INTERNET" /> 

    <application 
     android:allowBackup="true" 
     android:icon="@mipmap/ic_launcher" 
     android:label="@string/app_name" 
     android:roundIcon="@mipmap/ic_launcher_round" 
     android:supportsRtl="true" 
     android:theme="@style/AppTheme"> 
     <meta-data 
      android:name="com.facebook.sdk.ApplicationId" 
      android:value="@string/facebook_app_id" /> 

     <activity 
      android:name="com.facebook.FacebookActivity" 
      android:configChanges="keyboard|keyboardHidden|screenLayout|screenSize|orientation" 
      android:label="@string/app_name" /> 
     <activity 
      android:name="com.facebook.CustomTabActivity" 
      android:exported="true"> 
      <intent-filter> 
       <action android:name="android.intent.action.VIEW" /> 

       <category android:name="android.intent.category.DEFAULT" /> 
       <category android:name="android.intent.category.BROWSABLE" /> 

       <data android:scheme="@string/fb_login_protocol_scheme" /> 
      </intent-filter> 
     </activity> 
     <activity android:name=".LoginActivity"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 

     <provider 
      android:name="com.facebook.FacebookContentProvider" 
      android:authorities="com.facebook.app.FacebookContentProvider" 
      android:exported="true" /> 

     <activity 
      android:name=".MainActivity" 
      android:label="@string/title_activity_main" 
      android:theme="@style/AppTheme.NoActionBar"> 
     </activity> 
     <activity android:name=".EditProfileActivity" 
      android:parentActivityName=".MainActivity" > 
      <!-- The meta-data tag is required if you support API level 15 and lower --> 
      <meta-data 
       android:name="android.support.PARENT_ACTIVITY" 
       android:value=".MainActivity" /> 
     </activity> 
    </application> 

</manifest>

这里是我的MainActivity.java

package com.example.example;

import android.content.Intent; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.os.AsyncTask; 
import android.os.Bundle; 
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 java.io.InputStream; 

public class MainActivity extends AppCompatActivity 
     implements NavigationView.OnNavigationItemSelectedListener { 

    @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); 
    } 

    @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); 
     Bundle inBundle = getIntent().getExtras(); 
     String first_name = inBundle.get("first_name").toString(); 
     String last_name = inBundle.get("last_name").toString(); 
     String imageUrl = inBundle.get("imageUrl").toString(); 

     TextView nameView = (TextView)findViewById(R.id.nameView); 
     nameView.setText("" + first_name + " " + last_name); 
     new DownloadImage((ImageView)findViewById(R.id.imageView)).execute(imageUrl); 
     return true; 
    } 
    public class DownloadImage extends AsyncTask<String, Void, Bitmap> { 
     ImageView bmImage; 

     public DownloadImage(ImageView bmImage) { 
      this.bmImage = bmImage; 
     } 

     protected Bitmap doInBackground(String... urls) { 
      String urldisplay = urls[0]; 
      Bitmap mIcon11 = null; 
      try { 
       InputStream in = new java.net.URL(urldisplay).openStream(); 
       mIcon11 = BitmapFactory.decodeStream(in); 
      } catch (Exception e) { 
       Log.e("Error", e.getMessage()); 
       e.printStackTrace(); 
      } 
      return mIcon11; 
     } 

     protected void onPostExecute(Bitmap result) { 
      bmImage.setImageBitmap(result); 
     } 
    } 
    @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_camera) { 
      // Handle the camera action 
     } else if (id == R.id.nav_gallery) { 

     } 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) { 

     } else if(id == R.id.nav_user_edit){ 
      Intent intent = new Intent(this, EditProfileActivity.class); 
      startActivity(intent); 
     } 

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

来源

2017-06-05 Subrata Banerjee

什么是错误日志？ – Amy

发布您的logcat而不是您的屏幕设计。 –

更好地把错误日志猫。 –

你必须定义你的活动家长在清单文件中像这样

<meta-data 
      android:name="android.support.PARENT_ACTIVITY" 
      android:value="fully qualified activity name" />

确保你保持背部包含您的活动按钮，这个元数据。其他方面，它就像你不告诉你返回按钮去哪里！

你有这两条线在MainActivity.java文件中加入：

getSupportActionBar().setHomeButtonEnabled(true); 
getSupportActionBar().setDisplayHomeAsUpEnabled(true);

在onOptionsItemSelected（菜单项项）添加这个方法：

if (id==android.R.id.home) 
     { 
      NavUtils.navigateUpFromSameTask(this); 
     }

来源

2017-06-05 06:51:04 bharath

，所以它的完全合格的活动名称将是'COM。example.example.MainActivity'。我对android很陌生，所以我在问。 –

是的，它的完整的名称 – bharath

在哪里添加这2行？你能否更新我上面的MainActivity.java。以便我可以了解 –

在你toolbar.xml设置ImageView的。难道喜欢我你toolbar.xml

<ImageView 
    android:id="@+id/tv_header_title2" 
    android:layout_width="25dp" 
    android:layout_height="wrap_content" 
    android:layout_gravity="left" 
    android:src="@drawable/backbutton" 
    android:layout_marginLeft="15dp"/>

在MainActivity

ImageView img= (ImageView) findViewById(R.id.tv_header_title2); 



and 


    img.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      finish(); 
     } 
    });

来源

2017-06-05 07:17:15

我为什么要这样做？ –

应用程序崩溃背后可能有很多原因..我需要看到logcat。这也可以帮助你。只需转到Toolbar.xml并在MainActivity中添加一个imageview并对其进行简单的引用，并将setclick监听器添加到它。 –

操作栏崩溃应用的后退按钮android

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