apk不安装

-1

我正在安装和测试本地html文件。这不行，我不幸停了下来。然后，我尝试了简单的活动，没有任何创建。 Btu仍然是我得到同样的问题。应用无不是installing.android:minSdkVersion="8" 机器人：targetSdkVersion =‘16’apk不安装

05-13 10:09:49.325: D/dalvikvm(3136): Late-enabling CheckJNI 
05-13 10:09:49.475: D/AndroidRuntime(3136): Shutting down VM 
05-13 10:09:49.475: W/dalvikvm(3136): threadid=1: thread exiting with uncaught exception (group=0x414f42a0) 
05-13 10:09:49.480: E/AndroidRuntime(3136): FATAL EXCEPTION: main 
05-13 10:09:49.480: E/AndroidRuntime(3136): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.testweb/com.example.testweb.MainActivity}: java.lang.NullPointerException 
05-13 10:09:49.480: E/AndroidRuntime(3136):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2110) 
05-13 10:09:49.480: E/AndroidRuntime(3136):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2135) 
05-13 10:09:49.480: E/AndroidRuntime(3136):  at android.app.ActivityThread.access$700(ActivityThread.java:140) 
05-13 10:09:49.480: E/AndroidRuntime(3136):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1237) 
05-13 10:09:49.480: E/AndroidRuntime(3136):  at android.os.Handler.dispatchMessage(Handler.java:99) 
05-13 10:09:49.480: E/AndroidRuntime(3136):  at android.os.Looper.loop(Looper.java:137) 
05-13 10:09:49.480: E/AndroidRuntime(3136):  at android.app.ActivityThread.main(ActivityThread.java:4946) 
05-13 10:09:49.480: E/AndroidRuntime(3136):  at java.lang.reflect.Method.invokeNative(Native Method) 
05-13 10:09:49.480: E/AndroidRuntime(3136):  at java.lang.reflect.Method.invoke(Method.java:511) 
05-13 10:09:49.480: E/AndroidRuntime(3136):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1036) 
05-13 10:09:49.480: E/AndroidRuntime(3136):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:803) 
05-13 10:09:49.480: E/AndroidRuntime(3136):  at dalvik.system.NativeStart.main(Native Method) 
05-13 10:09:49.480: E/AndroidRuntime(3136): Caused by: java.lang.NullPointerException 
05-13 10:09:49.480: E/AndroidRuntime(3136):  at com.example.testweb.MainActivity.copyFile(MainActivity.java:55) 
05-13 10:09:49.480: E/AndroidRuntime(3136):  at com.example.testweb.MainActivity.onCreate(MainActivity.java:35) 
05-13 10:09:49.480: E/AndroidRuntime(3136):  at android.app.Activity.performCreate(Activity.java:5206) 
05-13 10:09:49.480: E/AndroidRuntime(3136):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094) 
05-13 10:09:49.480: E/AndroidRuntime(3136):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2074) 
05-13 10:09:49.480: E/AndroidRuntime(3136):  ... 11 more 
05-13 10:13:01.780: D/dalvikvm(3136): Debugger has detached; object registry had 1 entries 
05-13 10:14:49.625: I/Process(3136): Sending signal. PID: 3136 SIG: 9

代码：

public class MainActivity extends Activity { 

    Context mContext; 

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

     mContext = this; 

     File f = copyFile(R.raw.index, "index.html"); 
     File file = new File(f.getAbsolutePath()); 
     String extension = android.webkit.MimeTypeMap.getFileExtensionFromUrl(Uri.fromFile(file).toString()); 
     String mimetype = android.webkit.MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension); 
     Intent i = new Intent(Intent.ACTION_VIEW); 
    // i.setClassName("com.google.glass.browser", "com.google.glass.browser.WebBrowserActivity"); 

     i.setClassName("com.google.android.browser", "com.android.browser.BrowserActivity"); 

     i.setDataAndType(Uri.fromFile(file),mimetype); 
     mContext.startActivity(i); 


    } 

    private File copyFile(int resourceId, String filename) { 
     InputStream in = null; 
     OutputStream out = null; 
     File outFile = null; 
     try { 
      in = mContext.getResources().openRawResource(resourceId); 
      outFile = new File(mContext.getExternalFilesDir(null), filename); 
      Log.d("Test", "output file" + outFile.getAbsolutePath()); 
      out = new FileOutputStream(outFile); 
      byte[] buffer = new byte[1024]; 
      int read; 
      while((read = in.read(buffer)) != -1){ 
       out.write(buffer, 0, read); 
      } 
     } catch(IOException e) { 
      Log.e("Test", "Failed to copy file", e); 
     } finally { 
      try { 
       in.close(); 
       out.flush(); 
       out.close(); 
       in = null; 
       out = null; 
      } catch (Exception e){} 
     } 
     return outFile; 
    }

来源

2014-05-13 user3602987

您有一个'NullPointerException' @ line 55'MainActivity.java' – Raghunandan

请发布您的MainActivity.java代码。错误在55行和35行。 –

检查你的清单文件。 @siddharth：如何检测哪些行是错误？像你说的55和35 –

试试这个..

mContext未初始化尝试初始化它..

mContext = this;

内onCreate

来源

2014-05-13 05:02:43 Hariharan

获取相同的错误。 – user3602987

@ user3602987你在哪里添加该行？ – Hariharan

上下文mContext = this; – user3602987

您已经安装了应有更高版本的同一应用程序没有安装低版本的应用程序。

来源

2014-05-13 04:59:14 ConnectingCode

我认为我的代码崩溃了....你能检查我的代码是否正确？ – user3602987

你需要传递mContext参数copyFile()。

检查：

里面onCreate()，这样做：File f = copyFile(R.raw.index, "index.html", mContext);

代替mContext此外，您还可以使用MainActivity.this像：

File f = copyFile(R.raw.index, "index.html", MainActivity.this);

private File copyFile(int resourceId, String filename, Context mContext) { 
    InputStream in = null; 
    OutputStream out = null; 
    File outFile = null; 
    try { 
     in = mContext.getResources().openRawResource(resourceId); 
     outFile = new File(mContext.getExternalFilesDir(null), filename); 
     Log.d("Test", "output file" + outFile.getAbsolutePath()); 
     out = new FileOutputStream(outFile); 
     byte[] buffer = new byte[1024]; 
     int read; 
     while((read = in.read(buffer)) != -1){ 
      out.write(buffer, 0, read); 
     } 
    } catch(IOException e) { 
     Log.e("Test", "Failed to copy file", e); 
    } finally { 
     try { 
      in.close(); 
      out.flush(); 
      out.close(); 
      in = null; 
      out = null; 
     } catch (Exception e){} 
    } 
    return outFile; 
}

希望这有助于。

来源

2014-05-13 05:21:23

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