我正在处理一个项目,并希望读取通话记录并将它们写入文件并将其发送到服务器。我的代码阅读通话记录在单独的项目中正常工作。但是,当将代码与原始项目集成时,会导致NullPointerException。所有权限都已验证。 这里是我的代码ManagedQuery导致nullpointerexception
BufferedWriter buf = new BufferedWriter(new FileWriter(logFile, true));
buf.append("Testing ");
buf.newLine();
sb = new StringBuffer();
Uri str = CallLog.Calls.CONTENT_URI;
str.toString();
Log.e("TAG", str.toString());
@SuppressWarnings("deprecation")
Cursor managedCursor =managedQuery(CallLog.Calls.CONTENT_URI, null,
null, null, null);
Log.e("TAG", "in while " + ++i);
int number = managedCursor.getColumnIndex(CallLog.Calls.NUMBER);
int type = managedCursor.getColumnIndex(CallLog.Calls.TYPE);
int date = managedCursor.getColumnIndex(CallLog.Calls.DATE);
int duration = managedCursor.getColumnIndex(CallLog.Calls.DURATION);
sb.append("Call Details :");
logcat中显示了这种错误 05-15 16:17:14.107:E/AndroidRuntime(20715):致命异常:主要 05-15 16:17:14.107:E/AndroidRuntime (20715):java.lang.RuntimeException:无法启动活动ComponentInfo {com.example.atu_proto/com.example.atu_proto.MenuList}:java.lang.NullPointerException
05-15 16:17:14.107:E/AndroidRuntime(20715):at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2313)
05-15 16:17:14.107 :E/AndroidRuntime(20715):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2365)
05-15 16:17:14.107:E/AndroidRuntime(20715):at android.app.ActivityThread。访问$ 600(ActivityThread.java:156)
05-15 16:17:14.107:E/AndroidRuntime(20715):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1344)
05-15 16:17:14.107:E/AndroidRuntime(20715):at android.os.Handler.dispatchMessage(Handler.java:99)
05-15 16:17:14.107:E/AndroidRuntime(20715) :在android.os.Looper.loop(Looper.ja VA:153)
05-15 16:17:14.107:E/AndroidRuntime(20715):在android.app.ActivityThread.main(ActivityThread.java:5336)
05-15 16:17: 14.107:E/AndroidRuntime(20715):在java.lang.reflect.Method.invokeNative(本机方法)
05-15 16:17:14.107:E/AndroidRuntime(20715):在java.lang.reflect。 Method.invoke(Method.java:511)
05-15 16:17:14.107:E/AndroidRuntime(20715):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:833 )
05-15 16:17:14.107:E/AndroidRuntime(20715):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
05-15 16:17:14.107: E/AndroidRuntime(20715):在dalvik.system.NativeStart.main(本机方法)
05-15 16:17:14.107:E/AndroidRuntime(20715):产生的原因:显示java.lang.NullPointerException
05-15 16:17:14.107:E/AndroidRuntime(20715):在android.content.ContextWrapper.getContentResolver(ContextWrapper.java:99)
05-15 16:17:14.107:E/AndroidRuntime(20715 ): 晒黑droid.app.Activity.managedQuery(Activity.java:1751)
05-15 16:17:14.107:E/AndroidRuntime(20715):在com.example.atu_proto.CallLogsRetrieve.getCallDetails(CallLogsRetrieve.java:89 )
05-15 16:17:14.107:E/AndroidRuntime(20715):at com.example.atu_proto.MenuList.onCreate(MenuList。的java:78)
05-15 16:17:14.107:E/AndroidRuntime(20715):在android.app.Activity.performCreate(Activity.java:5122)
05-15 16:17: 14.107:E/AndroidRuntime(20715):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1081)
05-15 16:17:14.107:E/AndroidRuntime(20715):at android.app.ActivityThread .performLaunchActivity(ActivityThread.java:2277) 05-15 16:17:14.107:E/AndroidRuntime(20715):... 11更
可以附加logcat请 –
如果您收到异常,请始终在您的问题中包含logcat。 –
我已附加logcat输出。请检查这个。 – theanis46