我认为这是由于我设置了应用背景而导致的内存不足.
日志如下:
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.qingdaonews.bus/com.qingdaonews.activity.RealTime}:
java.lang.IllegalArgumentException: Wrong state class, expecting View State but received class android.view.View$BaseSavedState instead. This usually happens when two views of different type have the same id in the same hierarchy. This view's id is id/myviewpager. Make sure other views do not use the same id.
at android.app.ActivityThread.performlaunchActivity(ActivityThread.java:2266)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2316)
at android.app.ActivityThread.access$600(ActivityThread.java:150)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1298)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:213)
at android.app.ActivityThread.main(ActivityThread.java:5225)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:741)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
at dalvik.system.NativeStart.main(Native Method)
看起来由于视图的ID相同.实际上,ID’myviewpager’在xml文件中仅出现一次,并且仅在从后台重新打开应用程序时才会出现问题.
我的MainActivity有一个可以替换的片段.我使用getSupportFragmentManager().beginTransaction().replace(R.id.content_frame,fragment).commit();
当我开始活动时.
没有’savedInstanceState’的超级方法,我没有使用其他东西.
解决方法:
protected void onCreate(Bundle savedInstanceState){
super(savedInstanceState);
///...
getSupportFragmentManager().beginTransaction()
.replace(R.id.content_frame, fragment).commit();
}
如果通过调用super(savedInstanceState)的saveInstanceState!= null可以恢复关联的FragmentManager,并且所有提交的片段也都可以恢复.相反,请检查您的片段是否已添加,并仅在未添加时添加它:
public class MyActivity extends Activity{
private MyFragment myFragment;//extends Fragment
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//your stuff
FragmentManager fm = getFragmentManager();
myFragment = (MyFragment) fm.findFragmentByTag(MyFragment.TAG);
if(myFragment == null){
myFragment = new MyFragment();
fm.beginTransaction()
.add(R.id.content_frame, myFragment, MyFragment.TAG)
.commit();
}
//other stuff
}
}
在您的MyFragment中,TAG是:
公共静态最终字符串TAG = MyFragment.class.getSimpleName();
对于我来说,我发现添加带有TAG参数的片段是一个很好的做法.
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