2013-07-27 46 views
0

我需要从存储在内部存储器中的文件读取内容并将这些内容写入ListView。我的代码如下:在ANDROID中将内部文件内容写入到LISTVIEW中

StringBuilder sb = new StringBuilder(); 
FileInputStream fis = null; 
    try{ 
     BufferedReader reader = new BufferedReader(new InputStreamReader(fis, "UTF-8")); 
     String line = null; 
     while ((line = reader.readLine()) != null) { 
      sb.append(line).append("\n"); 
     } 
     fis.close(); 
    } catch(OutOfMemoryError om){ 
     om.printStackTrace(); 
    } catch(Exception ex){ 
     ex.printStackTrace(); 
    } 
    @SuppressWarnings("unused") 
    String result = sb.toString(); 
    ListView myListView = (ListView) findViewById(R.id.scores_display); 
    String[] strings = new String[]{"Test1","Test2"}; 
    ArrayAdapter<String> myArrayAdapter= new ArrayAdapter<String>(this, R.id.scores_display,strings); 
    myListView.setAdapter(myArrayAdapter); 

为了调试的目的,我刚才要求将字符串数组显示在列表中。但是,当我尝试打开此活动时,我的应用程序崩溃。 logcat错误报告被粘贴在下面。

07-27 06:17:23.991: E/Trace(769): error opening trace file: No such file or directory (2) 
07-27 06:17:52.536: E/AndroidRuntime(769): FATAL EXCEPTION: main 
07-27 06:17:52.536: E/AndroidRuntime(769):  android.content.res.Resources$NotFoundException: Resource ID #0x7f090004 type #0x12 is not valid 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.content.res.Resources.loadXmlResourceParser(Resources.java:2144) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.content.res.Resources.getLayout(Resources.java:853) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.view.LayoutInflater.inflate(LayoutInflater.java:394) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:371) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.widget.ArrayAdapter.getView(ArrayAdapter.java:362) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.widget.AbsListView.obtainView(AbsListView.java:2159) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.widget.ListView.measureHeightOfChildren(ListView.java:1246) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.widget.ListView.onMeasure(ListView.java:1158) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.view.View.measure(View.java:15518) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.widget.RelativeLayout.measureChild(RelativeLayout.java:666) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:477) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.view.View.measure(View.java:15518) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.view.View.measure(View.java:15518) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.widget.LinearLayout.measureVertical(LinearLayout.java:847) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.view.View.measure(View.java:15518) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
07-27 06:17:52.536: E/AndroidRuntime(769): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.view.View.measure(View.java:15518) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.view.Choreographer.doCallbacks(Choreographer.java:562) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.view.Choreographer.doFrame(Choreographer.java:532) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.os.Handler.handleCallback(Handler.java:725) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.os.Handler.dispatchMessage(Handler.java:92) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.os.Looper.loop(Looper.java:137) 
07-27 06:17:52.536: E/AndroidRuntime(769): at android.app.ActivityThread.main(ActivityThread.java:5041) 
07-27 06:17:52.536: E/AndroidRuntime(769): at java.lang.reflect.Method.invokeNative(Native Method) 
07-27 06:17:52.536: E/AndroidRuntime(769): at java.lang.reflect.Method.invoke(Method.java:511) 
07-27 06:17:52.536: E/AndroidRuntime(769): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
07-27 06:17:52.536: E/AndroidRuntime(769): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
07-27 06:17:52.536: E/AndroidRuntime(769): at dalvik.system.NativeStart.main(Native Method) 

我不能理解logcat报告。请帮我解释一下错误。

回答

1

我在代码中看到的唯一明显的错误是您将FileInputStream指定为null,然后在不进一步初始化的情况下引用它。

这里是你的问题的线路:

FileInputStream fis = null; // initialized as null 
// ... and then, in your try statement ... 
BufferedReader reader = new BufferedReader(new InputStreamReader(fis, "UTF-8")); // "fis" referenced but still null 

FileInputStream必须用File对象,FileDescriptor对象或代表FileString进行初始化。

例如:

FileInputStream fis = new FileInputStream(new File("myFile.txt")); 

您可能还需要看看您在其中的Android here访问文件的方式。