解决Launcher应用Unable to add window

1.问题关键日志

FATAL EXCEPTION: main
 Process: com.gxatek.cockpit.launcher, PID: 16450
 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.gxatek.cockpit.launcher/com.gxatek.cockpit.launcher.LauncherActivity}: android.view.WindowManager$BadTokenException: Unable to add window -- token android.os.BinderProxy@18b6d70 is not valid; is your activity running?
 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2951)
 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3086)
 	at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
 	at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
 	at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1816)
 	at android.os.Handler.dispatchMessage(Handler.java:106)
 	at android.os.Looper.loop(Looper.java:193)
 	at android.app.ActivityThread.main(ActivityThread.java:6718)
 	at java.lang.reflect.Method.invoke(Native Method)
 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
 Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token android.os.BinderProxy@18b6d70 is not valid; is your activity running?
 	at android.view.ViewRootImpl.setView(ViewRootImpl.java:798)
 	at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:356)
 	at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:93)
 	at com.iflytek.autofly.cardlist.window.CardListWindowManager.showCardList(CardListWindowManager.java:108)
 	at com.gxatek.cockpit.launcher.LauncherActivity.onCreate(LauncherActivity.java:153)
 	at android.app.Activity.performCreate(Activity.java:7144)
 	at android.app.Activity.performCreate(Activity.java:7135)
 	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2931)
 	... 11 more

2.日志分析

Unable to start activity ComponentInfo{com.gxatek.cockpit.launcher/com.gxatek.cockpit.launcher.LauncherActivity}: android.view.WindowManager$BadTokenException: Unable to add window -- token android.os.BinderProxy@18b6d70 is not valid; is your activity running?

从关键日志中可以看出系统提示PhoneWindow绑定了Activity，然而在向window上addview的时候，发现Activity已经被销毁了。

3.分析代码

找到Launcher代码

package com.iflytek.autofly.cardlist.window;

......

public class CardListWindowManager {
    
    private CardListWindowManager(Context context) {
        this.mContext = context;
        this.init();
        this.initCardList();
    }

    //Launcher主界面（LauncherActivity）传入context
    public static synchronized CardListWindowManager getInstance(Context context) {
        if (sInstance == null) {
            sInstance = new CardListWindowManager(context);
        }
        return sInstance;
    }
    
    private void init() {
        // 绑定mWindowManager和LauncherActivity
        this.mWindowManager和 = (WindowManager)this.mContext.getSystemService("window");
    }

	public void showCardList() {
        if (this.mCardListView != null && CARD_STATUS) {
            // 在调用addView的时候没有判断LauncherActivity是否已经被销毁
            this.mWindowManager.addView(this.mCardListView, this.mCardListParams);
            CARD_STATUS = false;
        }
    }
}

4.问题修复

修复方案有两种，第一种是在addview之前对activity判断是否已经finish了；第二种是phonewindow绑定全局context。

修复后的代码

public void showCardList() {
    if (mContext != null && mContext instanceof Activity){
        // 判断activity是否已经被销毁
        if (!((Activity)mContext).isFinishing() && this.mCardListView != null && CARD_STATUS) {
            this.mWindowManager.addView(this.mCardListView, this.mCardListParams);
            CARD_STATUS = false;
        }
    }
}