Android啓動畫面崩潰

Question

我的應用程序在啓動時顯示啓動畫面。屏幕將顯示3秒鐘。在顯示時，應用程序將從服務器下載json。無論何時3分鐘到達或下載完成（以較長的時間爲準），主屏幕都將被加載。以下代碼顯示了這是如何實現的。

if (isNetworkConnected()) { 
     networkConnected = true; 
    } else { 
     networkConnected = false; 
     toast(R.string.no_internet_connection); 
    } 

    new Handler().postDelayed(new Runnable() { 

     @Override 
     public void run() { 
      timeIsUp = true; 
      if (syncDone || !networkConnected) 
       loadHomeActivity(); 
     } 
    }, SPLASH_TIME_OUT); 

    Callback<DenkoModel> callback = new Callback<DenkoModel>() { 
     @Override 
     public void success(DenkoModel denkoModel, Response response) { 
      toast(R.string.server_connection_successful); 
      syncDone = true; 

      denkoStationService.updateDatabaseWithDenkoModel(denkoModel); 

      if (timeIsUp) 
       loadHomeActivity(); 
     } 

     @Override 
     public void failure(RetrofitError error) { 
      toast(R.string.server_connection_failed); 
      syncDone = true; 
      if (timeIsUp) 
       loadHomeActivity(); 
     } 
    }; 

    denkoStationService.fetchDenkoModel(denkoStationService.fetchDenkoLastDataState(), callback); 

該代碼在模擬器上正常工作，但是當我在真實設備上測試它時，應用程序會崩潰。我的猜測是線程問題導致應用程序崩潰，但所有事件都發生在主線程上。

什麼可能導致應用程序崩潰，我該如何解決這個問題？

編輯：我logcat的輸出

04-18 11:43:06.810 11612-11612/? W/SignalStrength﹕ getLevel=2 
04-18 11:43:07.230  429-446/? I/PackageManager﹕ Removing non-system package:org.bitbucket.infovillafoundation.denko 
04-18 11:43:07.390  429-472/? E/dalvikvm﹕ GC_EXPLICIT freed 1086K, 42% free 17256K/29447K, paused 4ms+25ms, total 120ms 
04-18 11:43:08.350  429-472/? I/PackageManager﹕ Updating external media status from unmounted to unmounted 


04-18 11:43:08.370 10350-10364/? I/k9﹕ storage path "/storage/sdcard0" unmounting 
04-18 11:43:08.410  429-446/? I/PackageManager﹕ Running dexopt on: org.bitbucket.infovillafoundation.denko 
04-18 11:43:08.890  429-503/? E/WifiHW﹕ wifi_send_command : SIGNAL_POLL ; interface index=0; 
04-18 11:43:09.690 10350-10364/? I/k9﹕ storage path "/storage/sdcard0" unmounted 
04-18 11:43:10.040  429-457/? W/lights﹕ TP Button Light current value is 255 


04-18 11:43:23.400 11913-11929/? I/PushLogAC2313﹕ [Thread-6813-6813]the pkgName:org.bitbucket.infovillafoundation.denko, localPkgName:com.huawei.android.pushagent(pushagent/null:-1) 


04-18 11:43:24.380 24178-24178/? I/AppAddOrRemoveListener﹕ org.bitbucket.infovillafoundation.denko uninstalled 
04-18 11:43:24.460  429-457/? I/ActivityManager﹕ Displayed 


04-18 11:43:24.460  429-457/? I/ActivityManager﹕ Displayed org.bitbucket.infovillafoundation.denko/.activity.SplashScreenActivity: +2s119ms 
04-18 11:43:24.470 11967-11967/? E/Trace﹕ error opening trace file: No such file or directory (2) 
04-18 11:43:24.550 11967-11967/? W/dalvikvm﹕ Refusing to reopen boot DEX '/system/framework/hwframework.jar' 


04-18 11:43:29.490 10526-11790/? W/AmazonAppstore.AppManagerAndroidPackageDelegate﹕ Unable to determine asin for package org.bitbucket.infovillafoundation.denko. Skipping metadata update. 


[ReceiverDispatcher-6814]responseAddPackage pkgName= org.bitbucket.infovillafoundation.denko(pushagent/null:-1) 
04-18 11:43:30.360 11913-11942/? I/PushLogAC2313﹕ [ReceiverDispatcher-6814]PushState get action :android.intent.action.PACKAGE_ADDED(pushagent/null:-1) 


04-18 11:43:32.480 24178-24178/? I/AppAddOrRemoveListener﹕ org.bitbucket.infovillafoundation.denko installed 
04-18 11:43:32.890 12113-12113/? E/Trace﹕ error opening trace file: No such file or directory (2) 


04-18 11:43:34.480 10526-11790/? W/AmazonAppstore.AppManagerAndroidPackageDelegate﹕ Unable to determine asin for package org.bitbucket.infovillafoundation.denko. Skipping metadata update. 
04-18 11:43:34.570 12159-12159/? W/System.err﹕ Invalid int: "" 
04-18 11:43:34.590 12159-12159/? W/ExpressLog﹕ can't find sdcard for log store. 
04-18 11:43:34.640 12159-12159/? I/UpdateManager﹕ 


04-18 11:43:34.950 24178-24178/? I/AppAddOrRemoveListener﹕ org.bitbucket.infovillafoundation.denko replaced 
04-18 11:43:34.990  429-3345/? E/LocSvc_api_rpc_glue﹕ V/proc: 1 prog: 3100008c vers: 50001 

編輯：

DenkoApplication.java

public class DenkoApplication extends Application { 

    private static Context initialContext; 
    private static SQLiteDatabase database; 

    @Override 
    public void onCreate() { 
     super.onCreate(); 
     initialContext = getApplicationContext(); 
     setupDb(); 
     setupLanguage(); 
     registerLocationListener(); 
    } 

    private void setupDb() { 
     DenkoDbHelper helper = new DenkoDbHelper(initialContext, "denko-stations-db", null); 
     database = helper.getWritableDatabase(); 
    } 

    public static Context getAppContext() { 
     return initialContext; 
    } 

    public static SQLiteDatabase getDatabase() { 
     return database; 
    } 

    private void setupLanguage() { 
     setLocale(readLanguage()); 
    } 

    private void setLocale(String lang) { 
     Locale myLocale = new Locale(lang); 
     Resources res = getResources(); 
     DisplayMetrics dm = res.getDisplayMetrics(); 
     Configuration conf = res.getConfiguration(); 
     conf.locale = myLocale; 
     res.updateConfiguration(conf, dm); 
    } 

    private void registerLocationListener() { 
     LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE); 
     LocationListener mlocListener = new DenkoLocationListener(); 
     mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, mlocListener); 
     DenkoLocationListener.isGpsEnabled = mlocManager.isProviderEnabled(LocationManager.GPS_PROVIDER); 
    } 

    private SharedPreferences obtainSharedPreferences() { 
     return getSharedPreferences("org.bitbucket.infovillafoundation.denko", Context.MODE_PRIVATE); 
    } 

    private String readLanguage() { 
     return obtainSharedPreferences().getString("org.bitbucket.infovillafoundation.denko.language", "en"); 
    } 
} 

SplashScreenActivity.java

public class SplashScreenActivity extends Activity { 

    private static int SPLASH_TIME_OUT = 3000; 

    @InjectView(R.id.imgLogo) 
    ImageView logoImage; 

    @InjectView(R.id.welcomeText) 
    TextView welcomeText; 

    boolean timeIsUp; 
    boolean syncDone; 
    boolean networkConnected; 

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

     ButterKnife.inject(this); 

     DenkoStationComponent component = DaggerDenkoStationComponent.builder().denkoStationModule(new DenkoStationModule()).build(); 
     final DenkoStationService denkoStationService = component.provideDenkoStationService(); 

     if (isNetworkConnected()) { 
      networkConnected = true; 
     } else { 
      networkConnected = false; 
      toast(R.string.no_internet_connection); 
     } 

     new Handler().postDelayed(new Runnable() { 

      @Override 
      public void run() { 
       timeIsUp = true; 
       if (syncDone || !networkConnected) 
        loadHomeActivity(); 
      } 
     }, SPLASH_TIME_OUT); 

     Callback<DenkoModel> callback = new Callback<DenkoModel>() { 
      @Override 
      public void success(DenkoModel denkoModel, Response response) { 
       toast(R.string.server_connection_successful); 
       syncDone = true; 

       denkoStationService.updateDatabaseWithDenkoModel(denkoModel); 

       if (timeIsUp) 
        loadHomeActivity(); 
      } 

      @Override 
      public void failure(RetrofitError error) { 
       toast(R.string.server_connection_failed); 
       syncDone = true; 
       if (timeIsUp) 
        loadHomeActivity(); 
      } 
     }; 

     denkoStationService.fetchDenkoModel(denkoStationService.fetchDenkoLastDataState(), callback); 
    } 

    private void loadHomeActivity() { 

     Intent intent = new Intent(SplashScreenActivity.this, MainActivity.class); 
     startActivity(intent); 

     finish(); 
    } 

    private SharedPreferences obtainSharedPreferences() { 
     return getSharedPreferences("org.bitbucket.infovillafoundation.denko", Context.MODE_PRIVATE); 
    } 

    private String readLanguage() { 
     return obtainSharedPreferences().getString("org.bitbucket.infovillafoundation.denko.language", "en"); 
    } 

    private void writeLanguage(String language) { 
     obtainSharedPreferences().edit().putString("org.bitbucket.infovillafoundation.denko.language", language).apply(); 
    } 

    public void toast(int textId) { 
     LayoutInflater inflater = getLayoutInflater(); 
     View layout = inflater.inflate(R.layout.toast_layout, 
       (ViewGroup) findViewById(R.id.toast_layout_root)); 

     TextView text = (TextView) layout.findViewById(R.id.toast_text); 
     text.setText(getResources().getString(textId)); 

     Toast toast = new Toast(getApplicationContext()); 
     toast.setDuration(Toast.LENGTH_LONG); 
     toast.setView(layout); 
     toast.show(); 
    } 
} 

MainActivity.java

public class MainActivity extends Activity { 

    private DrawerLayout mDrawerLayout; 

    private ListView mDrawerList; 

    private ActionBarDrawerToggle mDrawerToggle; 

    private String[] items; 


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

     items = getResources().getStringArray(R.array.menus); 

     mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); 
     mDrawerList = (ListView) findViewById(R.id.drawer_list); 

     DenkoMenuArrayAdapter adapter = new DenkoMenuArrayAdapter(this, items); 
     mDrawerList.setAdapter(adapter); 

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

      /* Called when drawer is closed */ 
      public void onDrawerClosed(View view) { 
       //Put your code here 
      } 

      /* Called when a drawer is opened */ 
      public void onDrawerOpened(View drawerView) { 
       //Put your code here 
      } 
     }; 

     /* Setting DrawerToggle on DrawerLayout */ 
     mDrawerLayout.setDrawerListener(mDrawerToggle); 

     mDrawerList.setOnItemClickListener(new OnItemClickListener() { 

      @Override 
      public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
       displayView(position); 
       mDrawerLayout.closeDrawer(mDrawerList); 
      } 
     }); 
     updateFragment(); 
    } 

    public void updateFragment() { 
     FragmentManager fragmentManager = getFragmentManager(); 

     MainViewFragment rFragment = new MainViewFragment(); 

     FragmentTransaction ft = fragmentManager.beginTransaction(); 
     ft.replace(R.id.content_frame, rFragment); 
     ft.commit(); 
    } 

    private void displayView(int position) { 

     Fragment fragment = null; 
     switch (position) { 
      case 0: 
       fragment = new MainViewFragment(); 
       break; 
      case 1: 
       fragment = new StationViewFragment(); 
       break; 
      case 2: 
       fragment = new MapViewFragment(); 
       break; 
      /*case 3: 
       fragment = new CommunityFragment(); 
       break; 
      case 4: 
       fragment = new PagesFragment(); 
       break; 
      case 5: 
       fragment = new WhatsHotFragment(); 
       break;*/ 

      default: 
       break; 
     } 

     if (fragment != null) { 
      FragmentManager fragmentManager = getFragmentManager(); 
      fragmentManager.beginTransaction() 
        .replace(R.id.content_frame, fragment).commit(); 

      mDrawerList.setItemChecked(position, true); 
      mDrawerList.setSelection(position); 
      mDrawerLayout.closeDrawer(mDrawerList); 
     } else { 

     } 
    } 

    @Override 
    protected void onPostCreate(Bundle savedInstanceState) { 
     super.onPostCreate(savedInstanceState); 
     mDrawerToggle.syncState(); 
    } 
} 

Answer 1

試試這個代碼，它爲我工作。

public class SplashActivity extends Activity { 
// Splash screen timer 
private Handler splashHandler = new Handler(); 

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

    Runnable r2 = new Runnable() { 
     @Override 
     public void run() { 
      finish(); 
      overridePendingTransition(R.anim.fade_in, R.anim.fade_out); 
     } 
    }; 
    Runnable r = new Runnable() { 
     public void run() { 
      Intent brain = new Intent(SplashActivity.this, LoginActivity.class); 
      startActivity(brain); 
      finish(); 
      overridePendingTransition(R.anim.fade_in, R.anim.fade_out); 
     } 
    }; 
    setContentView(R.layout.splash_screen); 
    if (isNetworkAvailable()) 
     splashHandler.postDelayed(r, 3000); 
    else { 
     //splashHandler.postDelayed(r, 3000); 
     //Notify user they aren't connected 
     Toast.makeText(getApplicationContext(), "You aren't connected to the internet.", Toast.LENGTH_LONG).show(); 
     splashHandler.postDelayed(r, 3000); 
     //close the app 
     //finish(); 
    } 
} 

public void onResume(Bundle savedInstanceState) { 
    super.onResume(); 
} 

private boolean isNetworkAvailable() { 
    ConnectivityManager connectivityManager 
      = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); 
    NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo(); 
    return activeNetworkInfo != null; 
} 
}