当我试图关闭DrawerLayout我的应用程序崩溃

我有一些有线问题。在我向下滚动时试图关闭DrawerLayout时，应用程序崩溃。如果您需要任何代码，我将添加。谢谢。当我试图关闭DrawerLayout我的应用程序崩溃

我希望这段代码能帮到你。当我拖动DrawerLayout直到它结束并按下某个东西或尝试关闭它时，该应用只会崩溃。

public class newsfeed_activity extends AppCompatActivity 
    implements NavigationView.OnNavigationItemSelectedListener { 

private android.support.v7.widget.Toolbar toolbar_main; 
private android.support.v7.widget.Toolbar toolbar_web; 
private ListAdapter listadapter; 
private SwipeRefreshLayout refreshList; 
private ListView listView_article; 
private Handler handler = new Handler(); 
private WebView web; 
private WebBackForwardList webBackForwardList; 
private DrawerLayout drawer; 

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

    Intent welcome = new Intent(this,Explanation.class); 
    startActivity(welcome); 

    if(FacebookAndGoogle.isLoggedWithFacebook()) 
    { 
     FacebookAndGoogle.getBitmapFromURL(FacebookAndGoogle.getCurrentFacebookProfile().getProfilePictureUri(500, 500).toString()); 
     FacebookAndGoogle.setFullName(FacebookAndGoogle.getCurrentFacebookProfile().getName()); 
    } 
    else if(FacebookAndGoogle.isLoggedWithGoogle()) 
    { 
     FacebookAndGoogle.getBitmapFromURL(FacebookAndGoogle.getCurrentGoogleProfile().getImage().getUrl().replace("sz=50", "sz=500").toString()); 
     FacebookAndGoogle.setFullName(FacebookAndGoogle.getCurrentGoogleProfile().getDisplayName()); 
    } 
    createWebView(); 
    toolbar_web = (android.support.v7.widget.Toolbar) findViewById(R.id.toolbar_web); 
    setSupportActionBar(toolbar_web); 
    getSupportActionBar().setDisplayShowTitleEnabled(false); 
    toolbar_web.setVisibility(View.GONE); 
    toolbar_main = (android.support.v7.widget.Toolbar) findViewById(R.id.toolbar_main); 
    setSupportActionBar(toolbar_main); 
    getSupportActionBar().setDisplayShowTitleEnabled(false); 
    saveInInternalFolder("NewzBay", "check"); 
    Vector<Article> articles = new Vector<Article>(); 
    articles.add(new Article("Subject", "כותרת ראשית 1", "Second Headline", BitmapFactory.decodeResource(getResources(), R.drawable.anchor), null, "Site", "http://www.ynet.co.il/articles/0,7340,L-4740637,00.html", 605, 24, true)); 
    articles.add(new Article("Subject", "כותרת ראשית 2", "Second Headline", BitmapFactory.decodeResource(getResources(), R.drawable.anchor), null, "Site", "http://www.google.co.il", 524, 53, false)); 
    articles.add(new Article("Subject", "כותרת ראשית 3", "Second Headline", BitmapFactory.decodeResource(getResources(), R.drawable.anchor), null, "Site", "http://www.facebook.com", 106, 40, true)); 
    listView_article = (ListView) findViewById(R.id.listView_articles); 
    listadapter = new ArticleAdapter(this, articles, web, toolbar_main, toolbar_web); 
    listView_article.setAdapter(listadapter); 
    createSwipeRefreshLayout(); 

    drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
      this, drawer, toolbar_main, R.string.navigation_drawer_open, R.string.navigation_drawer_close) { 
     @Override 
     public void onDrawerSlide(View drawerView, float slideOffset) { 
      super.onDrawerSlide(drawerView, slideOffset); 
      drawerHandler(drawer); 
     } 
    }; 
    toggle.setDrawerIndicatorEnabled(false); 
    toolbar_main.setNavigationIcon(R.drawable.anchor); 
    toolbar_main.setNavigationOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      drawerHandler(drawer); 
     } 
    }); 
    drawer.setDrawerListener(toggle); 
    toggle.syncState(); 

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


public boolean onNavigationItemSelected(MenuItem item) { 
    // Handle navigation view item clicks here. 
    int id = item.getItemId(); 
    if (id == R.id.nav_hot_news) { 
     Intent intent = new Intent(this, ExploreArticles.class); 
     startActivity(intent); 
     this.onStop(); 
    } else if (id == R.id.nav_news) { 

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

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

    } else if (id == R.id.nav_settings) { 
     Intent settings = new Intent(this, settings_activity.class); 
     startActivity(settings); 
     this.onStop(); 
    } 
    else if (id == R.id.nav_discconect) { 
     if (FacebookAndGoogle.isLoggedWithGoogle()) { 
      Plus.AccountApi.clearDefaultAccount(FacebookAndGoogle.getmGoogleApiClient()); 
      FacebookAndGoogle.getmGoogleApiClient().disconnect(); 
      FacebookAndGoogle.getmGoogleApiClient().connect(); 
     } 
     else if(FacebookAndGoogle.isLoggedWithFacebook()) 
     { 
      FacebookAndGoogle.reset(BitmapFactory.decodeResource(getResources(), R.drawable.user_icon)); 
      LoginManager.getInstance().logOut(); 
     } 
     FacebookAndGoogle.reset(BitmapFactory.decodeResource(getResources(), R.drawable.user_icon)); 
     Intent intent = new Intent(this, entrance.class); 
     startActivity(intent); 
     finish(); 
    } 
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
    drawer.closeDrawer(GravityCompat.START); 
    return true; 
}

XML活动的

<?xml version="1.0" encoding="utf-8"?>

<include 
    layout="@layout/app_bar_newsfeed_activity" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" /> 

<android.support.design.widget.NavigationView 
    android:id="@+id/nav_view" 
    android:layout_width="wrap_content" 
    android:layout_height="match_parent" 
    android:layout_gravity="start" 
    android:fitsSystemWindows="true" 
    app:headerLayout="@layout/nav_header_newsfeed_activity" 
    app:menu="@menu/newsfeed_activity_drawer" />

我发现logcat的：

03-03 14:11:27.390 2115-2115/magshimim.newzbay E/AndroidRuntime: FATAL EXCEPTION: main 
                  Process: magshimim.newzbay, PID: 2115 
                  java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference 
                   at magshimim.newzbay.newsfeed_activity.drawerHandler(newsfeed_activity.java:241) 
                   at magshimim.newzbay.newsfeed_activity.access$100(newsfeed_activity.java:39) 
                   at magshimim.newzbay.newsfeed_activity$1.onDrawerSlide(newsfeed_activity.java:94) 
                   at android.support.v4.widget.DrawerLayout.dispatchOnDrawerSlide(DrawerLayout.java:773) 
                   at android.support.v4.widget.DrawerLayout.setDrawerViewOffset(DrawerLayout.java:784) 
                   at android.support.v4.widget.DrawerLayout$ViewDragCallback.onViewPositionChanged(DrawerLayout.java:1848) 
                   at android.support.v4.widget.ViewDragHelper.continueSettling(ViewDragHelper.java:737) 
                   at android.support.v4.widget.DrawerLayout.computeScroll(DrawerLayout.java:1130) 
                   at android.view.View.updateDisplayListIfDirty(View.java:14986) 
                   at android.view.View.getDisplayList(View.java:15022) 
                   at android.view.View.draw(View.java:15789) 
                   at android.view.ViewGroup.drawChild(ViewGroup.java:3678) 
                   at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3472) 
                   at android.view.View.updateDisplayListIfDirty(View.java:14994) 
                   at android.view.View.getDisplayList(View.java:15022) 
                   at android.view.View.draw(View.java:15789) 
                   at android.view.ViewGroup.drawChild(ViewGroup.java:3678) 
                   at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3472) 
                   at android.view.View.updateDisplayListIfDirty(View.java:14994) 
                   at android.view.View.getDisplayList(View.java:15022) 
                   at android.view.View.draw(View.java:15789) 
                   at android.view.ViewGroup.drawChild(ViewGroup.java:3678) 
                   at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3472) 
                   at android.view.View.updateDisplayListIfDirty(View.java:14994) 
                   at android.view.View.getDisplayList(View.java:15022) 
                   at android.view.View.draw(View.java:15789) 
                   at android.view.ViewGroup.drawChild(ViewGroup.java:3678) 
                   at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3472) 
                   at android.view.View.updateDisplayListIfDirty(View.java:14994) 
                   at android.view.View.getDisplayList(View.java:15022) 
                   at android.view.View.draw(View.java:15789) 
                   at android.view.ViewGroup.drawChild(ViewGroup.java:3678) 
                   at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3472) 
                   at android.view.View.draw(View.java:16071) 
                   at android.widget.FrameLayout.draw(FrameLayout.java:592) 
                   at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:2916) 
                   at android.view.View.updateDisplayListIfDirty(View.java:14999) 
                   at android.view.View.getDisplayList(View.java:15022) 
                   at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:275) 
                   at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:281) 
                   at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:320) 
                   at android.view.ViewRootImpl.draw(ViewRootImpl.java:2741) 
                   at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2573) 
                   at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2165) 
                   at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1180) 
                   at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6558) 
                   at android.view.Choreographer$CallbackRecord.run(Choreographer.java:777) 
                   at android.view.Choreographer.doCallbacks(Choreographer.java:590) 
                   at android.view.Choreographer.doFrame(Choreographer.java:560) 
                   at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:763) 
                   at android.os.Handler.handleCallback(Handler.java:739) 
                   at android.os.Handler.dispatchMessage(Handler.java:95) 
                   at android.os.Looper.loop(Looper.java:145) 
                   at android.app.ActivityThread.main(ActivityThread.java:5832) 
                   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:1399) 
                   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)

来源

2016-03-03 Netanel

请从logcat中发表您的相关代码和堆栈跟踪.... – Opiatefuchs

从logcat中添加堆栈跟踪... –

我没有得到任何错误......那为什么我问你们。它只是没有任何错误的崩溃。 – Netanel

错误发生在您的活动的drawerHandle()。你很可能试图通过findViewById（）获取对视图的引用，而不是获取它。方法的主体drawerHandle(...)，否则很难确切地说出那里有什么问题。

来源

2016-03-03 12:28:59 Dmitriy

为什么你会发现onItemSelected方法。你也可以找到视图并点击查看child.Your过程就像这样工作。找到抽屉视图 selecet孩子。并再次找到Dirawerview.All时间再次查找视图。 '

DrawerLayout抽屉=（DrawerLayout）findViewById（R.id.drawer_layout）; //删除此行，因为您已经创建了 drawer.closeDrawer（GravityCompat.START）;

来源

2016-03-03 12:21:37

Ty for Dmitriy :) 发生了什么事是我试图将文本和图片设置为空引用。

private void drawerHandler(DrawerLayout drawer) 
{ 
    if (drawer.isDrawerOpen(GravityCompat.START)) { 
     drawer.closeDrawer(GravityCompat.START); 
    } 
    else { 
     drawer.openDrawer(GravityCompat.START); 
    } 
    TextView userFullName = (TextView) drawer.findViewById(R.id.tv_userFullName); 
    if(userFullName != null) 
    { 
     userFullName.setText(FacebookAndGoogle.getFullName()); 
    } 
    ImageButton userPic = (ImageButton) drawer.findViewById(R.id.ib_userPic); 
    if(userPic != null) 
    { 
     userPic.setImageBitmap(RoundedImageView.getCroppedBitmap(FacebookAndGoogle.getProfilePic(), 240)); 
    } 
}

来源

2016-03-03 12:35:34 Netanel

太棒了。我猜你刚刚发现了logcat，并且可以在那里读取堆栈跟踪，它实际上是一个非常有用的工具。另外，在android和'Log.d（String，String）'方法中查看'Log'类，它可以让您将一些信息放到logcat中，以便您可以跟踪应用程序的执行路径和变量值附加调试器的必要性。 – Dmitriy

当我试图关闭DrawerLayout我的应用程序崩溃

回答

相关问题