一个Toast报错问题 java.lang.IllegalStateException: View has already been added to the window manager.

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1.进入应用，然后退出当前Activity，再进入应用，总是会报错。

10-28 17:54:20.104 29138-29138/com.letv.tv D/AndroidRuntime: Shutting down VM

10-28 17:54:20.106 29138-29138/com.letv.tv E/AndroidRuntime: FATAL EXCEPTION: main

Process: com.letv.tv, PID: 29138

java.lang.IllegalStateException: View com.letv.core.scaleview.ScaleRelativeLayout{ff1169b V.E...... ......I. 0,0-0,0} has already been added to the window manager.

at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:281)

at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:85)

at android.widget.Toast$TN.handleShow(Toast.java:430)

at android.widget.Toast$TN$1.run(Toast.java:336)

at android.os.Handler.handleCallback(Handler.java:739)

at android.os.Handler.dispatchMessage(Handler.java:95)

at android.os.Looper.loop(Looper.java:148)

at android.app.ActivityThread.main(ActivityThread.java:5417)

at java.lang.reflect.Method.invoke(Native Method)

at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:731)

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:621)

2.查了半天也找不到原因，后来发现问题出在自定义的Toast。写了一个单例的Toast类，但是重新进入时，单例类还是之前的那个，view没有销毁；但是又重新被添加。所以才会报错。

private static volatile LeChildToast sInstance;public LeChildToast(Context context) {    super(context);    View view = LayoutInflater.from(context).inflate(R.layout.lechild_toast, null);    // 动态设置背景    int paddingLeft = view.getPaddingLeft();    int paddingTop = view.getPaddingTop();    int paddingRight = view.getPaddingRight();    int paddingBottom = view.getPaddingBottom();    view.setBackgroundDrawable(SkinManager.getDrawable(R.drawable.lechild_toast_bg));    view.setPadding(paddingLeft, paddingTop, paddingRight, paddingBottom);    // 动态设置图标    View icon = view.findViewById(R.id.icon);    icon.setBackgroundDrawable(SkinManager.getDrawable(R.attr.lechild_drawable_lechild_toast_icon));    this.mTextView = (TextView) view.findViewById(R.id.msg);    this.setView(view);}public static void reset() {    sInstance = null;}

3.解决方案，在Activity的基类里,onDestory()的时候调用reset()，保证view可以被销毁。

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