android.support.v4.app.BackStackRecord.doAddOp(BackStackRecord）

错误处理日志：

09-03 16:55:16.820:E/AndroidRuntime(16873): FATAL EXCEPTION: main

09-03 16:55:16.820:E/AndroidRuntime(16873): Process: com.clockrock.freeshare, PID: 16873

09-03 16:55:16.820: E/AndroidRuntime(16873):java.lang.NullPointerException

09-03 16:55:16.820:E/AndroidRuntime(16873): atandroid.support.v4.app.BackStackRecord.doAddOp(BackStackRecord.java:416)

09-03 16:55:16.820:E/AndroidRuntime(16873): atandroid.support.v4.app.BackStackRecord.replace(BackStackRecord.java:451)

09-03 16:55:16.820:E/AndroidRuntime(16873): atandroid.support.v4.app.BackStackRecord.replace(BackStackRecord.java:443)

09-03 16:55:16.820:E/AndroidRuntime(16873): atcom.clockrock.freeshare.StartActivity.onCheckedChanged(StartActivity.java:477)

09-03 16:55:16.820:E/AndroidRuntime(16873): atandroid.widget.RadioGroup.setCheckedId(RadioGroup.java:174)

09-03 16:55:16.820:E/AndroidRuntime(16873): atandroid.widget.RadioGroup.access$600(RadioGroup.java:54)

09-03 16:55:16.820: E/AndroidRuntime(16873): atandroid.widget.RadioGroup$CheckedStateTracker.onCheckedChanged(RadioGroup.java:358)

09-03 16:55:16.820:E/AndroidRuntime(16873): atandroid.widget.CompoundButton.setChecked(CompoundButton.java:130)

09-03 16:55:16.820: E/AndroidRuntime(16873): atandroid.widget.CompoundButton.toggle(CompoundButton.java:87)

09-03 16:55:16.820:E/AndroidRuntime(16873): atandroid.widget.RadioButton.toggle(RadioButton.java:76)

09-03 16:55:16.820:E/AndroidRuntime(16873): atandroid.widget.CompoundButton.performClick(CompoundButton.java:99)

09-03 16:55:16.820:E/AndroidRuntime(16873): atandroid.view.View$PerformClick.run(View.java:19385)

09-03 16:55:16.820:E/AndroidRuntime(16873): atandroid.os.Handler.handleCallback(Handler.java:808)

09-03 16:55:16.820:E/AndroidRuntime(16873): atandroid.os.Handler.dispatchMessage(Handler.java:103)

09-03 16:55:16.820:E/AndroidRuntime(16873): atandroid.os.Looper.loop(Looper.java:193)

09-03 16:55:16.820:E/AndroidRuntime(16873): atandroid.app.ActivityThread.main(ActivityThread.java:5348)

09-03 16:55:16.820:E/AndroidRuntime(16873): atjava.lang.reflect.Method.invokeNative(Native Method)

09-03 16:55:16.820:E/AndroidRuntime(16873): atjava.lang.reflect.Method.invoke(Method.java:515)

09-03 16:55:16.820:E/AndroidRuntime(16873): atcom.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:829)

09-03 16:55:16.820:E/AndroidRuntime(16873): atcom.android.internal.os.ZygoteInit.main(ZygoteInit.java:645)

09-03 16:55:16.820:E/AndroidRuntime(16873): atdalvik.system.NativeStart.main(Native Method)

第358行代码是这样的：红色标记

case 0:

fragment = fragments.get(0);//对应编号为0的fragment

transaction.replace(R.id.main_framelayout, fragment);

transaction.commit();

title.setText("国内");

break;

错误原因是：fragment在使用的时候没有new 我就直接fragments.add（fragment）了

第二个错误：Call requires API level 11 (current min is 8): android.widget.AbsListView#setAdapter

改 android:minSdkVersion="14"为11以上，我改成了14