Question

我正在为学校项目开发一个基本的Android应用程序。一切都工作正常，直到我放入一个新的类作为我的文件对象 - 我写入其变量，然后将对象保存到SD卡。但是我现在得到一个调试错误。它不包含对我自己的代码的任何引用 - 它似乎是指在启动活动时发生的事情，而不是在执行我的代码时。有什么建议？调试控制台中的错误消息如下：

Homework Planner [Android Application]  
DalvikVM[localhost:8600]    
    Thread [<1> main] (Suspended (exception RuntimeException))  
        <VM does not provide monitor information>   
        ActivityThread.performLaunchActivity(ActivityThread$ActivityClientRecord, Intent) line: 2194    
        ActivityThread.handleLaunchActivity(ActivityThread$ActivityClientRecord, Intent) line: 2229 
        ActivityThread.access$600(ActivityThread, ActivityThread$ActivityClientRecord, Intent) line: 139    
        ActivityThread$H.handleMessage(Message) line: 1261  
        ActivityThread$H(Handler).dispatchMessage(Message) line: 99 
        Looper.loop() line: 154 
        ActivityThread.main(String[]) line: 4945    
        Method.invokeNative(Object, Object[], Class, Class[], Class, int, boolean) line: not available [native method]  
        Method.invoke(Object, Object...) line: 511  
        ZygoteInit$MethodAndArgsCaller.run() line: 784  
        ZygoteInit.main(String[]) line: 551 
        NativeStart.main(String[]) line: not available [native method]  
    Thread [<10> Binder Thread #2] (Running)    
    Thread [<9> Binder Thread #1] (Running) 
    Daemon Thread [<8> FinalizerWatchdogDaemon] (Running)   
    Daemon Thread [<7> FinalizerDaemon] (Running)   
    Daemon Thread [<6> ReferenceQueueDaemon] (Running)

以下是活动开始的代码：

public class InputActivity extends Activity {
String chosenSubject = null;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_input);

    // Set up the spinner and it's listener
    Spinner subjectSpinner = (Spinner) findViewById(R.id.deadlinePicker);
    subjectSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {


        public void onNothingSelected(AdapterView<?> arg0) {}

        public void onItemSelected(AdapterView<?> arg0, View arg1,
                int arg2, long arg3) {
            chosenSubject = (String) arg0.getItemAtPosition(arg2);

        }

    });

    // Set up save button
   Button saveButton = (Button) findViewById(R.id.btnSave);
   saveButton.setOnClickListener(new OnClickListener() {
        public void onClick(View arg0) {
            //saveFile();
        }           
    });        
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_input, menu);
   return true;
}

Answer 1

确保在清单文件中包含适当的权限，以便在SD卡中写入数据：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

还要确保将活动包含在清单文件中：

<activity android:name=".InputActivity"/>

Android LaunchActivity错误

1 个答案: