Question

我正在开发一个应用程序，其中我有一次打开活动（名为“logIn”），然后是我的main_activity。在一些博客的帮助下，我试图在main_activity中实现导航抽屉（名为“聊天”）。

我的Chats.java文件：

public class Chats extends AppCompatActivity {

String TITLES[] = {"Home","Events","Mail","Shop","Travel"};
int ICONS[] = {R.drawable.ic_action_alarms,R.drawable.ic_action_alarms,R.drawable.ic_action_alarms,R.drawable.ic_action_alarms,R.drawable.ic_action_alarms};

String NAME = "Karan Nagpal";
String EMAIL = "nagpalkaran95@gmail.com";
int PROFILE = R.drawable.ic_action_alarms;

private Toolbar toolbar;                              // Declaring the Toolbar Object

RecyclerView mRecyclerView;                           // Declaring RecyclerView
RecyclerView.Adapter mAdapter;                        // Declaring Adapter For Recycler View
RecyclerView.LayoutManager mLayoutManager;            // Declaring Layout Manager as a linear layout manager
DrawerLayout Drawer;                                  // Declaring DrawerLayout

ActionBarDrawerToggle mDrawerToggle;


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

    Boolean isFirstTime;
    SharedPreferences app_preferences = getSharedPreferences("mainuser",MODE_PRIVATE);
    SharedPreferences.Editor editor = app_preferences.edit();

    isFirstTime = app_preferences.getBoolean("isFirstTime", true);

    if (isFirstTime) {
        Intent i = new Intent(this, logIn.class);
        startActivity(i);
        editor.putBoolean("isFirstTime", false);
        editor.commit();
    }
    else{
        setContentView(R.layout.activity_chats);
        final String username = app_preferences.getString("username", null);
        if(username==null){
            Intent i = new Intent(this, logIn.class);
            startActivity(i);
            editor.putBoolean("isFirstTime", false);
            editor.commit();
        }
        TextView main_user = (TextView) findViewById(R.id.main_user);
        main_user.setText(username);

    }

    toolbar = (Toolbar) findViewById(R.id.tool_bar);
    setSupportActionBar(toolbar);

    mRecyclerView = (RecyclerView) findViewById(R.id.RecyclerView); // Assigning the RecyclerView Object to the xml View

    mRecyclerView.setHasFixedSize(true);                            // Letting the system know that the list objects are of fixed size

    mAdapter = new MyAdapter(TITLES,ICONS,NAME,EMAIL,PROFILE);       

    mRecyclerView.setAdapter(mAdapter);                              

    mLayoutManager = new LinearLayoutManager(this);                 

    mRecyclerView.setLayoutManager(mLayoutManager);                 


    Drawer = (DrawerLayout) findViewById(R.id.drawer_layout);        
    mDrawerToggle = new ActionBarDrawerToggle(this,Drawer,toolbar,R.string.openDrawer,R.string.closeDrawer){

        @Override
        public void onDrawerOpened(View drawerView) {
            super.onDrawerOpened(drawerView);

        }

        @Override
        public void onDrawerClosed(View drawerView) {
            super.onDrawerClosed(drawerView);
        }
    };

    Drawer.setDrawerListener(mDrawerToggle); 
    mDrawerToggle.syncState();               
   }
}

记录错误：

  10-02 23:53:31.484 2258-2334/com.nagpal.karan.radarchat I/OpenGLRenderer: Initialized EGL, version 1.4
  10-02 23:53:31.503 2258-2334/com.nagpal.karan.radarchat D/OpenGLRenderer: Enabling debug mode 0
  10-02 23:53:31.516 2258-2258/com.nagpal.karan.radarchat E/Xposed: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context android.view.View.getContext()' on a null object reference
        at tw.fatminmin.xposed.minminguard.blocker.NameBlocking.clearAdViewInLayout(NameBlocking.java:87)
        at tw.fatminmin.xposed.minminguard.blocker.NameBlocking$3.afterHookedMethod(NameBlocking.java:150)
        at de.robv.android.xposed.XposedBridge.handleHookedMethod(XposedBridge.java:754)
        at android.view.LayoutInflater.inflate(<Xposed>)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
        at de.robv.android.xposed.XposedBridge.invokeOriginalMethodNative(Native Method)
        at de.robv.android.xposed.XposedBridge.handleHookedMethod(XposedBridge.java:740)
        at android.view.LayoutInflater.inflate(<Xposed>)
        at com.nagpal.karan.radarchat.MyAdapter.onCreateViewHolder(MyAdapter.java:98)
        at com.nagpal.karan.radarchat.MyAdapter.onCreateViewHolder(MyAdapter.java:11)
        at android.support.v7.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java:5836)
        at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5060)
        at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4970)
        at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2029)
        at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1414)
        at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1377)
        at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:578)
        at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3315)
        at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3124)
        at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3568)
        at android.view.View.layout(View.java:15715)
        at android.view.ViewGroup.layout(ViewGroup.java:5046)
        at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:1221)
        at android.view.View.layout(View.java:15715)
        at android.view.ViewGroup.layout(ViewGroup.java:5046)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
        at android.view.View.layout(View.java:15715)
        at android.view.ViewGroup.layout(ViewGroup.java:5046)
        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)
        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)
        at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)
        at android.view.View.layout(View.java:15715)
        at android.view.ViewGroup.layout(ViewGroup.java:5046)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
        at android.view.View.layout(View.java:15715)
        at android.view.ViewGroup.layout(ViewGroup.java:5046)
        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)
        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)
        at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)
        at android.view.View.layout(View.java:15715)
        at android.view.ViewGroup.layout(ViewGroup.java:5046)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
        at android.view.View.layout(View.java:15715)
        at android.view.ViewGroup.layout(ViewGroup.java:5046)
        at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2097)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1854)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1069)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5915)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
        at android.view.Choreographer.doCallbacks(Choreographer.java:580)
        at android.view.Choreographer.doFrame(Choreographer.java:550)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
        at android.os.Handler.handleCallback(Handler.java:739)
        at android.os.Handler.dispatchMessag
  10-02 23:53:31.517 2258-2258/com.nagpal.karan.radarchat E/Xposed: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context android.view.View.getContext()' on a null object reference
        at tw.fatminmin.xposed.minminguard.blocker.NameBlocking.clearAdViewInLayout(NameBlocking.java:87)
        at tw.fatminmin.xposed.minminguard.blocker.NameBlocking$3.afterHookedMethod(NameBlocking.java:150)
        at de.robv.android.xposed.XposedBridge.handleHookedMethod(XposedBridge.java:754)
        at android.view.LayoutInflater.inflate(<Xposed>)
        at com.nagpal.karan.radarchat.MyAdapter.onCreateViewHolder(MyAdapter.java:98)
        at com.nagpal.karan.radarchat.MyAdapter.onCreateViewHolder(MyAdapter.java:11)
        at android.support.v7.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java:5836)
        at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5060)
        at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4970)
        at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2029)
        at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1414)
        at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1377)
        at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:578)
        at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3315)
        at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3124)
        at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3568)
        at android.view.View.layout(View.java:15715)
        at android.view.ViewGroup.layout(ViewGroup.java:5046)
        at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:1221)
        at android.view.View.layout(View.java:15715)
        at android.view.ViewGroup.layout(ViewGroup.java:5046)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
        at android.view.View.layout(View.java:15715)
        at android.view.ViewGroup.layout(ViewGroup.java:5046)
        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)
        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)
        at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)
        at android.view.View.layout(View.java:15715)
        at android.view.ViewGroup.layout(ViewGroup.java:5046)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
        at android.view.View.layout(View.java:15715)
        at android.view.ViewGroup.layout(ViewGroup.java:5046)
        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)
        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)
        at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)
        at android.view.View.layout(View.java:15715)
        at android.view.ViewGroup.layout(ViewGroup.java:5046)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
        at android.view.View.layout(View.java:15715)
        at android.view.ViewGroup.layout(ViewGroup.java:5046)
        at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2097)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1854)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1069)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5915)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
        at android.view.Choreographer.doCallbacks(Choreographer.java:580)
        at android.view.Choreographer.doFrame(Choreographer.java:550)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
        at android.os.Handler.handleCallback(Handler.java:739)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:139)
        at android.app.ActivityThread.main(ActivityThread.java:5298)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndAr
  10-02 23:53:31.517 2258-2258/com.nagpal.karan.radarchat D/AndroidRuntime: Shutting down VM
  10-02 23:53:31.520 2258-2258/com.nagpal.karan.radarchat E/AndroidRuntime: FATAL EXCEPTION: main
  Process: com.nagpal.karan.radarchat, PID: 2258
  android.view.InflateException: Binary XML file line #43: Error inflating class de.hdodenhof.circleimageview.CircleImageView
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:757)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
        at de.robv.android.xposed.XposedBridge.invokeOriginalMethodNative(Native Method)
        at de.robv.android.xposed.XposedBridge.handleHookedMethod(XposedBridge.java:740)
        at android.view.LayoutInflater.inflate(<Xposed>)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
        at de.robv.android.xposed.XposedBridge.invokeOriginalMethodNative(Native Method)
        at de.robv.android.xposed.XposedBridge.handleHookedMethod(XposedBridge.java:740)
        at android.view.LayoutInflater.inflate(<Xposed>)
        at com.nagpal.karan.radarchat.MyAdapter.onCreateViewHolder(MyAdapter.java:98)
        at com.nagpal.karan.radarchat.MyAdapter.onCreateViewHolder(MyAdapter.java:11)
        at android.support.v7.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java:5836)
        at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5060)
        at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4970)
        at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2029)
        at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1414)
        at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1377)
        at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:578)
        at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3315)
        at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3124)
        at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3568)
        at android.view.View.layout(View.java:15715)
        at android.view.ViewGroup.layout(ViewGroup.java:5046)
        at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:1221)
        at android.view.View.layout(View.java:15715)
        at android.view.ViewGroup.layout(ViewGroup.java:5046)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
        at android.view.View.layout(View.java:15715)
        at android.view.ViewGroup.layout(ViewGroup.java:5046)
        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)
        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)
        at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)
        at android.view.View.layout(View.java:15715)
        at android.view.ViewGroup.layout(ViewGroup.java:5046)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
        at android.view.View.layout(View.java:15715)
        at android.view.ViewGroup.layout(ViewGroup.java:5046)
        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)
        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)
        at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)
        at android.view.View.layout(View.java:15715)
        at android.view.ViewGroup.layout(ViewGroup.java:5046)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
        at android.view.View.layout(View.java:15715)
        at android.view.ViewGroup.layout(ViewGroup.java:5046)
        at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2097)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1854)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1069)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5915)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
        at android.view.Choreographer.doCallbacks(Choreographer.java:580)
        at android.view.Choreographer.doFrame(Choreographer.java:550)
        at android.view.Choreographer$FrameD
  10-02 23:53:31.521 2258-2258/com.nagpal.karan.radarchat D/AppTracker: App Event: crash
  10-02 23:53:31.870 2258-2258/com.nagpal.karan.radarchat I/Process: Sending signal. PID: 2258 SIG: 9

xml文件：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="178dp"
android:background="@drawable/ic_action_alarms"
android:orientation="vertical"
android:weightSum="1">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="56dp"
    android:orientation="vertical"
    android:layout_alignParentBottom="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true">
    <TextView
        android:id="@+id/name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="16dp"
        android:textColor="#ffffff"
        android:text="Akash Bangad"
        android:textSize="14sp"
        android:textStyle="bold"
        />
    <TextView
        android:id="@+id/email"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#ffffff"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="5dp"
        android:text="akash.bangad93@gmail.com"
        android:textSize="14sp"
        android:textStyle="normal"/>
</LinearLayout>
<de.hdodenhof.circleimageview.CircleImageView
    android:layout_width="70dp"
    android:layout_height="70dp"
    android:src="@drawable/ic_action_alarms"
    android:layout_marginLeft="16dp"
    android:layout_marginTop="38dp"
    android:id="@+id/circleView"
    />

Answer 1

setContentView()仅在if-else语句的else部分中调用。这意味着如果你的逻辑进入if部分，它将开始一个像你一样的新活动但是它会继续，因为你没有完成活动。

在if-else之后，你正在做findViewById()。如果没有附加到活动的视图，则无法工作。

只需在this.finish()部分

中致电if即可

OR

只需取消注释setContentView(R.layout.activity_chats);，然后将其从else部分移除。

我推荐第二个选项。如果您打算开始一项新活动，如果您首先附加一个视图，它将不会有所作为。

编辑：

替换它：

<de.hdodenhof.circleimageview.CircleImageView
    android:layout_width="70dp"
    android:layout_height="70dp"
    android:src="@drawable/ic_action_alarms"
    android:layout_marginLeft="16dp"
    android:layout_marginTop="38dp"
    android:id="@+id/circleView" />

有了这个：

<de.hdodenhof.circleimageview.CircleImageView
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/circleView"
    android:layout_width="70dp"
    android:layout_height="70dp"
    android:src="@drawable/ic_action_alarms"
    android:layout_marginLeft="16dp"
    android:layout_marginTop="38dp" />

我的应用程序正在与导航抽屉崩溃

1 个答案: