android异常：Can not perform this action after onSaveInstanc

最新推荐文章于 2024-08-16 09:46:51 发布

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最新推荐文章于 2024-08-16 09:46:51 发布

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本文分析了一种在Android应用中常见的对话框导致的崩溃问题，特别是在Android 4.0版本上。通过具体代码示例展示了如何在启动新的Activity之前正确地关闭对话框，避免因状态丢失引发的异常。

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04-23 17:43:44.283: E/AndroidRuntime(9170): FATAL EXCEPTION: main
04-23 17:43:44.283: E/AndroidRuntime(9170): java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
04-23 17:43:44.283: E/AndroidRuntime(9170): at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1327)
04-23 17:43:44.283: E/AndroidRuntime(9170): at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1338)
04-23 17:43:44.283: E/AndroidRuntime(9170): at android.support.v4.app.FragmentManagerImpl.popBackStack(FragmentManager.java:501)
04-23 17:43:44.283: E/AndroidRuntime(9170): at android.support.v4.app.DialogFragment.dismissInternal(DialogFragment.java:180)
04-23 17:43:44.283: E/AndroidRuntime(9170): at android.support.v4.app.DialogFragment.onDismiss(DialogFragment.java:349)
04-23 17:43:44.283: E/AndroidRuntime(9170): at android.app.Dialog$ListenersHandler.handleMessage(Dialog.java:1228)
04-23 17:43:44.283: E/AndroidRuntime(9170): at android.os.Handler.dispatchMessage(Handler.java:99)
04-23 17:43:44.283: E/AndroidRuntime(9170): at android.os.Looper.loop(Looper.java:137)
04-23 17:43:44.283: E/AndroidRuntime(9170): at android.app.ActivityThread.main(ActivityThread.java:4424)
04-23 17:43:44.283: E/AndroidRuntime(9170): at java.lang.reflect.Method.invokeNative(Native Method)
04-23 17:43:44.283: E/AndroidRuntime(9170): at java.lang.reflect.Method.invoke(Method.java:511)
04-23 17:43:44.283: E/AndroidRuntime(9170): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:787)
04-23 17:43:44.283: E/AndroidRuntime(9170): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554)
04-23 17:43:44.283: E/AndroidRuntime(9170): at dalvik.system.NativeStart.main(Native Meth

现象：再点击dialog按钮，执行一个startactivity后即报错，

从日志分析应该是activity destory了，但是dialog没有清除。

代码如下

public Dialog onCreateDialog(Bundle savedInstanceState) {
// Log.i(TAG, ":"+version.updateurl);
return new AlertDialog.Builder(getActivity())
.setTitle(R.string.update_tip)
.setCancelable(false)
.setIcon(R.drawable.icon)
.setMessage(version.vdesc)
.setPositiveButton(R.string.update_download_tip,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
// saveUpdateApk(version.updateurl);
Toast.makeText(getActivity(), R.string.update_install_tip,
Toast.LENGTH_SHORT).show();
dialog.dismiss();
Uri uri = Uri.parse(version.updateurl);
Intent intent = new Intent(
Intent.ACTION_VIEW, uri);
getActivity().startActivity(intent);
}
})
.setNegativeButton(version.force ? R.string.quit : R.string.update_cancel,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
if (version.force)
getActivity().finish();
}
}).create();
}

解决方案：在startActivity之前调用了dialog.dismiss()然后就不报错了，

此问题发生在Android 4.0上，其他版本没发现问题。