AndroidRuntime Herunterfahren Fatal Ausnahme: Haupt Android Studio 2.2

Question

Arbeiten an einer App und lief auf ein Problem nur, wenn ich es auf einem Telefon ausführen. Hier

ist der Run Info:

09/24 21:02:00: Launching app 
Cold swapped changes. 
$ adb shell am start -n "com.example.crow.page3/com.example.crow.page3.Page3main" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER 
Client not ready yet..Connected to process 1154 on device oneplus-a0001-793b4d36 
I/art: Late-enabling -Xcheck:jni 
W/System: ClassLoader referenced unknown path: /data/app/com.example.crow.page3-2/lib/arm 
I/InstantRun: Instant Run Runtime started. Android package is com.example.crow.page3, real application class is null. 
W/System: ClassLoader referenced unknown path: /data/app/com.example.crow.page3-2/lib/arm 
I/LoadedApk: No resource references to update in package common 
I/LoadedApk: No resource references to update in package com.blinq.theme.CleanUI.blue 
I/LoadedApk: No resource references to update in package com.blinq.theme.CleanUI.blue 
W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable 
D/AndroidRuntime: Shutting down VM 
E/AndroidRuntime: FATAL EXCEPTION: main 
        Process: com.example.crow.page3, PID: 1154 
        Theme: themes:{default=overlay:com.blinq.theme.CleanUI.blue, iconPack:com.blinq.theme.CleanUI.blue, fontPkg:com.blinq.theme.CleanUI.blue, com.android.systemui=overlay:com.blinq.theme.CleanUI.blue, com.android.systemui.navbar=overlay:com.blinq.theme.CleanUI.blue} 
        java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.crow.page3/com.example.crow.page3.Page3main}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TabHost.setup()' on a null object reference 
         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2450) 
         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2510) 
         at android.app.ActivityThread.-wrap11(ActivityThread.java) 
         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1363) 
         at android.os.Handler.dispatchMessage(Handler.java:102) 
         at android.os.Looper.loop(Looper.java:148) 
         at android.app.ActivityThread.main(ActivityThread.java:5461) 
         at java.lang.reflect.Method.invoke(Native Method) 
         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
        Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TabHost.setup()' on a null object reference 
         at com.example.crow.page3.Page3main.onCreate(Page3main.java:54) 
         at android.app.Activity.performCreate(Activity.java:6251) 
         at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108) 
         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2403) 
         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2510)  
         at android.app.ActivityThread.-wrap11(ActivityThread.java)  
         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1363)  
         at android.os.Handler.dispatchMessage(Handler.java:102)  
         at android.os.Looper.loop(Looper.java:148)  
         at android.app.ActivityThread.main(ActivityThread.java:5461)  
         at java.lang.reflect.Method.invoke(Native Method)  
         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)  
         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)  
I/Process: Sending signal. PID: 1154 SIG: 9 
Application terminated. 

Ich habe einige Dinge ausprobiert und waren über den Code mehrfach. unten ist der Code für com.example.crow.page3.Page3main:

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.EditText; 
import android.widget.Button; 
import android.widget.TabHost; 
import android.app.Activity; 


import com.google.android.gms.appindexing.Action; 
import com.google.android.gms.appindexing.AppIndex; 
import com.google.android.gms.appindexing.Thing; 
import com.google.android.gms.common.api.GoogleApiClient; 

public class Page3main extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener { 

    EditText nameTxt, phoneTxt, emailTxt, addressTxt; 
    /** 
    * ATTENTION: This was auto-generated to implement the App Indexing API. 
    * See https://g.co/AppIndexing/AndroidStudio for more information. 
    */ 
    private GoogleApiClient client; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 


     //add new contact:-------------------------------------------------- 
     setContentView(R.layout.activity_page3main); 
     nameTxt = (EditText) findViewById(R.id.txtName); 
     phoneTxt = (EditText) findViewById(R.id.txtPhone); 
     emailTxt = (EditText) findViewById(R.id.txtEmail); 
     addressTxt = (EditText) findViewById(R.id.txtAddress); 

     //define tabs for from add contact tabs 
     TabHost tabHost = (TabHost) findViewById(R.id.tabHost); 

     tabHost.setup(); 

     TabHost.TabSpec tabSpec = tabHost.newTabSpec("creator"); 
     tabSpec.setContent(R.id.tabAddContact); 
     tabSpec.setIndicator("Creator"); 
     tabHost.addTab(tabSpec); 

     tabSpec = tabHost.newTabSpec("list"); 
     tabSpec.setContent(R.id.tabContactList); 
     tabSpec.setIndicator("List"); 
     tabHost.addTab(tabSpec); 

     final Button addBtn = (Button) findViewById(R.id.btnAdd); 

     //What happens on : 
     nameTxt.addTextChangedListener(new TextWatcher() { 
      @Override 
      public void beforeTextChanged(CharSequence s, int i, int i2, int i3) { 

      } 

      @Override 
      public void onTextChanged(CharSequence s, int i, int i2, int i3) { 
       //check if there was input in the text 
       addBtn.setEnabled(!nameTxt.getText().toString().trim().isEmpty()); 
      } 

      @Override 
      public void afterTextChanged(Editable editable) { 

      } 
     }); 

     //------------------------------------------------------------------- 


     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); 
     // ATTENTION: This was auto-generated to implement the App Indexing API. 
     // See https://g.co/AppIndexing/AndroidStudio for more information. 
     client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build(); 
    } 

    @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.page3main, menu); 
     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(); 
     FragmentManager fragmentManager = getFragmentManager(); 

     if (id == R.id.nav_logbook) { 
      fragmentManager.beginTransaction() 
        .replace(R.id.content_frame, new FirstFragmentLogbook()).commit(); 
     } else if (id == R.id.nav_contacts) { 
      fragmentManager.beginTransaction() 
        .replace(R.id.content_frame, new SecondFragmentContacts()).commit(); 
     } else if (id == R.id.nav_map) { 
      fragmentManager.beginTransaction() 
        .replace(R.id.content_frame, new ThirdFragmentMap()).commit(); 
     } else if (id == R.id.nav_site_info) { 

     } 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; 
    } 

    /** 
    * ATTENTION: This was auto-generated to implement the App Indexing API. 
    * See https://g.co/AppIndexing/AndroidStudio for more information. 
    */ 
    public Action getIndexApiAction() { 
     Thing object = new Thing.Builder() 
       .setName("Page3main Page") // TODO: Define a title for the content shown. 
       // TODO: Make sure this auto-generated URL is correct. 
       .setUrl(Uri.parse("http://[ENTER-YOUR-URL-HERE]")) 
       .build(); 
     return new Action.Builder(Action.TYPE_VIEW) 
       .setObject(object) 
       .setActionStatus(Action.STATUS_TYPE_COMPLETED) 
       .build(); 
    } 

    @Override 
    public void onStart() { 
     super.onStart(); 

     // ATTENTION: This was auto-generated to implement the App Indexing API. 
     // See https://g.co/AppIndexing/AndroidStudio for more information. 
     client.connect(); 
     AppIndex.AppIndexApi.start(client, getIndexApiAction()); 
    } 

    @Override 
    public void onStop() { 
     super.onStop(); 

     // ATTENTION: This was auto-generated to implement the App Indexing API. 
     // See https://g.co/AppIndexing/AndroidStudio for more information. 
     AppIndex.AppIndexApi.end(client, getIndexApiAction()); 
     client.disconnect(); 
    } 
} 

würden Irgendwelche Ideen sehr geschätzt. Dank

Layout-Code:

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    tools:context=".Page3main" 
    android:orientation="vertical" 
    android:baselineAligned="false" 
    android:weightSum="1"> 


    <TabHost 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent" 
     android:id="@+id/tabHost" 
     android:layout_gravity="left|center_vertical"> 

     <LinearLayout 
      android:layout_width="fill_parent" 
      android:layout_height="fill_parent" 
      android:orientation="vertical"> 

      <TabWidget 
       android:id="@android:id/tabs" 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content"> 
      </TabWidget> 

      <FrameLayout 
       android:id="@android:id/tabcontent" 
       android:layout_width="fill_parent" 
       android:layout_height="fill_parent"> 

       <LinearLayout 
        android:id="@+id/tabContactList" 
        android:layout_width="match_parent" 
        android:layout_height="match_parent" 
        android:orientation="vertical"> 

        <TextView 
         android:text="TextView" 
         android:layout_width="match_parent" 
         android:layout_height="wrap_content" 
         android:id="@+id/textView3" 
         android:textAppearance="@android:style/TextAppearance.Material.Large" 
         android:layout_margin="10dp" 
         android:layout_gravity="center" 
         android:textAlignment="center" /> 

        <ListView 
         android:layout_width="match_parent" 
         android:layout_height="match_parent" /> 
       </LinearLayout> 

       <LinearLayout 
        android:id="@+id/tabAddContact" 
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent" 
        android:orientation="vertical"> 

        <TextView 

         android:layout_width="wrap_content" 
         android:layout_height="wrap_content" 
         android:id="@+id/lblCreatorTitle" 
         android:layout_gravity="center" 
         android:textAppearance="?android:attr/textAppearanceLarge" 
         android:text="New Contact" 
         android:layout_margin="10dp" /> 

        <EditText 
         android:layout_width="match_parent" 
         android:layout_height="wrap_content" 
         android:ems="10" 
         android:id="@+id/txtName" 
         android:hint="Name" 
         android:inputType="textPersonName" 
         android:layout_gravity="center" 
         android:layout_weight="0.10" 
         android:drawableStart="@drawable/ic_contacts_black_24dp" /> 

        <EditText 
         android:layout_width="match_parent" 
         android:layout_height="wrap_content" 
         android:inputType="phone" 
         android:ems="10" 
         android:id="@+id/txtPhone" 
         android:hint="Phone" 
         android:layout_gravity="center" 
         android:layout_weight="0.10" 
         android:drawableStart="@drawable/ic_call_black_24dp" /> 

        <EditText 
         android:layout_width="match_parent" 
         android:layout_height="wrap_content" 
         android:inputType="textEmailAddress" 
         android:ems="10" 
         android:id="@+id/txtEmail" 
         android:hint="Email" 
         android:layout_gravity="center" 
         android:layout_weight="0.10" 
         android:drawableStart="@drawable/ic_email_black_24dp" /> 

        <EditText 
         android:layout_width="match_parent" 
         android:layout_height="wrap_content" 
         android:inputType="textPostalAddress" 
         android:ems="10" 
         android:id="@+id/txtAddress" 
         android:hint="Address" 
         android:layout_gravity="center" 
         android:layout_weight="0.10" 
         android:drawableStart="@drawable/ic_place_black_24dp" /> 

        <Button 
         android:text="Add" 
         android:layout_width="match_parent" 
         android:layout_height="wrap_content" 
         android:id="@+id/btnAdd" 
         android:textAlignment="center" 
         android:layout_gravity="center" /> 
       </LinearLayout> 

      </FrameLayout> 
     </LinearLayout> 
    </TabHost> 

</LinearLayout> 

Answer 1

Wie pro Ihre Login Sie sind bei android.widget.TabHost.setup()

Das Problem einen Null-Zeiger Ausnahme bekommen ist wahrscheinlich in den folgenden Codezeilen

//define tabs for from add contact tabs 
    TabHost tabHost = (TabHost) findViewById(R.id.tabHost); 

    tabHost.setup(); 

In Der obige Code der R.id.tabHost gibt einen Nullzeiger zurück. Bitte überprüfen Sie, ob diese ID in Ihrem Layout definiert ist. Auch wenn Sie den Code, wo diese ID platziert ist, veröffentlichen, könnte ich Ihnen weiter helfen.

EDIT

Ok so das Problem Methode Sie anrufen Setup ist, nachdem Sie die Registerkarten geladen haben findViewById verwenden. Sie müssen die Methode setup aufrufen, bevor Sie die Registerkarten findViewByid laden.

Siehe den Screenshot unten der Entwicklerdokumentation.

Hier ist die link auf der Dokumentationsseite. Ich hoffe das hilft.