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  • startActivity时报错Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag

    原代码如下:

    Intent intent = new Intent();
    intent.setClass(mContext, PhotoView.class);
    Bundle bundle = new Bundle();
    intent.putExtras(bundle); 
    mContext.startActivity(intent);

    报错如下:

    06-28 11:24:40.359: E/AndroidRuntime(7397): android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity  context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?
    06-28 11:24:40.359: E/AndroidRuntime(7397):     at android.app.ContextImpl.startActivity(ContextImpl.java:617)
    06-28 11:24:40.359: E/AndroidRuntime(7397):     at android.content.ContextWrapper.startActivity(ContextWrapper.java:258)
    06-28 11:24:40.359: E/AndroidRuntime(7397):     at com.hotalk.ui.homepage.favorites.FavoritesListAdapter$7.onClick(FavoritesListAdapter.java:1509)
    06-28 11:24:40.359: E/AndroidRuntime(7397):     at android.view.View.performClick(View.java:2408)
    06-28 11:24:40.359: E/AndroidRuntime(7397):     at android.view.View$PerformClick.run(View.java:8816)
    06-28 11:24:40.359: E/AndroidRuntime(7397):     at android.os.Handler.handleCallback(Handler.java:587)
    06-28 11:24:40.359: E/AndroidRuntime(7397):     at android.os.Handler.dispatchMessage(Handler.java:92)
    06-28 11:24:40.359: E/AndroidRuntime(7397):     at android.os.Looper.loop(Looper.java:123)
    06-28 11:24:40.359: E/AndroidRuntime(7397):     at android.app.ActivityThread.main(ActivityThread.java:4627)
    06-28 11:24:40.359: E/AndroidRuntime(7397):     at java.lang.reflect.Method.invokeNative(Native Method)
    06-28 11:24:40.359: E/AndroidRuntime(7397):     at java.lang.reflect.Method.invoke(Method.java:521)
    06-28 11:24:40.359: E/AndroidRuntime(7397):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
    06-28 11:24:40.359: E/AndroidRuntime(7397):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
    06-28 11:24:40.359: E/AndroidRuntime(7397):     at dalvik.system.NativeStart.main(Native Method)

    原因是:

      Context中有一个startActivity方法,Activity继承自Context,重载了startActivity方法。如果使用 Activity的startActivity方法,不会有任何限制,而如果使用Context的startActivity方法的话,就需要开启一个新的task,遇到上面那个异常的,都是因为使用了Context的startActivity方法。解决办法是,加一个flag。intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 

    修改后代码如下:

    Intent intent = new Intent();
    intent.setClass(mContext, PhotoView.class);
    Bundle bundle = new Bundle();
    intent.putExtras(bundle);
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
    mContext.startActivity(intent);
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  • 原文地址:https://www.cnblogs.com/Free-Thinker/p/6707506.html
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