我的android應用程序意外停止，如何在android studio中進行調試？

-1

因爲，我是android新手。我不明白調試我的應用程序的方法。只要我嘗試打開它，我的應用就會停止工作。我正在嘗試創建側邊欄或導航抽屜。我的android應用程序意外停止，如何在android studio中進行調試？

這裏是我的佈局：

<android.support.v4.widget.DrawerLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:id="@+id/drawer_layout" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 


    <!-- The first child in the layout is for the main Activity UI--> 
    <RelativeLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:paddingLeft="@dimen/activity_horizontal_margin" 
     android:paddingRight="@dimen/activity_horizontal_margin" 
     android:paddingTop="@dimen/activity_vertical_margin" 
     android:paddingBottom="@dimen/activity_vertical_margin" 
     tools:context=".MainActivity" 
     android:background="#ffffffff"> 


     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_centerHorizontal="true" 
      android:text="Holy Operating Systems, Batdroid!" 
      android:textSize="24sp" 
      android:gravity="center" 
      android:layout_marginTop="100dp"/> 


     <ImageView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:src="@drawable/batdroid" 
      android:layout_alignParentBottom="true" 
      android:layout_centerHorizontal="true"/> 


    </RelativeLayout> 


    <!-- Side navigation drawer UI --> 
    <ListView 
     android:id="@+id/navList" 
     android:layout_width="200dp" 
     android:layout_height="match_parent" 
     android:layout_gravity="left|start" 
     android:background="#ffeeeeee"/> 


</android.support.v4.widget.DrawerLayout>

這裏是在MainActivity代碼：

package ems.pixelapp.com.ems; 


     import android.content.res.Configuration; 
     import android.os.Bundle; 
     import android.support.v4.widget.DrawerLayout; 
     import android.support.v7.app.ActionBarActivity; 
     import android.support.v7.app.ActionBarDrawerToggle; 
     import android.view.Menu; 
     import android.view.MenuItem; 
     import android.view.View; 
     import android.widget.AdapterView; 
     import android.widget.ArrayAdapter; 
     import android.widget.ListView; 
     import android.widget.Toast; 




public class MainActivity extends ActionBarActivity { 


    private ListView mDrawerList; 
    private DrawerLayout mDrawerLayout; 
    private ArrayAdapter<String> mAdapter; 
    private ActionBarDrawerToggle mDrawerToggle; 
    private String mActivityTitle; 


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


     mDrawerList = (ListView)findViewById(R.id.navList); 
     mDrawerLayout = (DrawerLayout)findViewById(R.id.drawer_layout); 
     mActivityTitle = getTitle().toString(); 


     addDrawerItems(); 
     setupDrawer(); 


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


    private void addDrawerItems() { 
     String[] osArray = { "Android", "iOS", "Windows", "OS X", "Linux" }; 
     mAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, osArray); 
     mDrawerList.setAdapter(mAdapter); 


     mDrawerList.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
       Toast.makeText(MainActivity.this, "Time for an upgrade!", Toast.LENGTH_SHORT).show(); 
      } 
     }); 
    } 


    private void setupDrawer() { 
     mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.string.drawer_open, R.string.drawer_close) { 


      /** Called when a drawer has settled in a completely open state. */ 
      public void onDrawerOpened(View drawerView) { 
       super.onDrawerOpened(drawerView); 
       getSupportActionBar().setTitle("Navigation!"); 
       invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu() 
      } 


      /** Called when a drawer has settled in a completely closed state. */ 
      public void onDrawerClosed(View view) { 
       super.onDrawerClosed(view); 
       getSupportActionBar().setTitle(mActivityTitle); 
       invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu() 
      } 
     }; 


     mDrawerToggle.setDrawerIndicatorEnabled(true); 
     mDrawerLayout.setDrawerListener(mDrawerToggle); 
    } 


    @Override 
    protected void onPostCreate(Bundle savedInstanceState) { 
     super.onPostCreate(savedInstanceState); 
     // Sync the toggle state after onRestoreInstanceState has occurred. 
     mDrawerToggle.syncState(); 
    } 


    @Override 
    public void onConfigurationChanged(Configuration newConfig) { 
     super.onConfigurationChanged(newConfig); 
     mDrawerToggle.onConfigurationChanged(newConfig); 
    } 


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


     // Activate the navigation drawer toggle 
     if (mDrawerToggle.onOptionsItemSelected(item)) { 
      return true; 
     } 


     return super.onOptionsItemSelected(item); 
    } 
}

這裏是我得到，由於其我的應用程序已停止工作

01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime: FATAL EXCEPTION: main 
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{ems.pixelapp.com.ems/ems.pixelapp.com.ems.MainActivity}: java.lang.NullPointerException 
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2355) 
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2391) 
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at android.app.ActivityThread.access$600(ActivityThread.java:151) 
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1353) 
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at android.os.Handler.dispatchMessage(Handler.java:99) 
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at android.os.Looper.loop(Looper.java:155) 
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at android.app.ActivityThread.main(ActivityThread.java:5559) 
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at java.lang.reflect.Method.invokeNative(Native Method) 
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at java.lang.reflect.Method.invoke(Method.java:511) 
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1074) 
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:841) 
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at dalvik.system.NativeStart.main(Native Method) 
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime: Caused by: java.lang.NullPointerException 
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at ems.pixelapp.com.ems.MainActivity.onCreate(MainActivity.java:45) 
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at android.app.Activity.performCreate(Activity.java:5066) 
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1102) 
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2311) 
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2391)  
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at android.app.ActivityThread.access$600(ActivityThread.java:151)  
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1353)  
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at android.os.Handler.dispatchMessage(Handler.java:99)  
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at android.os.Looper.loop(Looper.java:155)  
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at android.app.ActivityThread.main(ActivityThread.java:5559)  
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at java.lang.reflect.Method.invokeNative(Native Method)  
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at java.lang.reflect.Method.invoke(Method.java:511)  
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1074)  
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:841)  
01-13 16:24:51.807 11270-11270/ems.pixelapp.com.ems E/AndroidRuntime:  at dalvik.system.NativeStart.main(Native Method)

來源

2016-01-13 topsy coder

什麼是45行？ –

當你看堆棧跟蹤，你可以看到它發生的原因：*引起：java.lang.NullPointerException ...在ems.pixelapp.com.ems.MainActivity.onCreate（MainActivity.java:45）*（這說你在'MainActivity.java'，'45'行的'onCreate（）'中有'NullPointerException'。您應該通過編輯您的問題在文件中指明該行。 – Fllo

Hello Fllo和gabriele，我的第45行有這樣的代碼：getSupportActionBar（）。setDisplayHomeAsUpEnabled（true）; –

的錯誤@Roshan指出，我使用的是不支持getSupportActionBar（）的主題。

我將我的主題改爲Theme.AppCompat，它的功能就像一個魅力。

來源

2016-01-13 11:54:36

我的android應用程序意外停止，如何在android studio中進行調試？

回答

相關問題