Android7.1.1(API25) Toast异常

在Android7.1.1(API25)上同时展示两个windowmanager.LayoutParams.type = type_toast，会抛出错误：

android.view.WindowManager$BadTokenException
Unable to add window -- token android.os.BinderProxy@451a42a is not valid; is your activity running?
测试代码：

 WindowManager mw = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
        TextView tv = new TextView(this);
        tv.setLayoutParams(new WindowManager.LayoutParams(-2,-2));
        tv.setText("windowmanager 添加悬浮窗");
        WindowManager.LayoutParams  params =new WindowManager.LayoutParams();
        params.type = WindowManager.LayoutParams.TYPE_TOAST;
        mw.addView(tv,params);

        Toast toast = new Toast(this);
        toast.makeText(this,"API25 type_toast",Toast.LENGTH_LONG).show();

可以通过反射解决：

/**
 * 7.1.1(api25)Toast BadTokenException问题；之后版本Google捕获异常，就不会crash了。
 * Android，利用反射捕获异常解决版本中遇到的问题。
 */
public class SafeToast {
    private static final String TAG = "SafeToast";
    private static Field sField_TN;
    private static Field sField_TN_Handler;
    private static Toast mToast;

    static {
        try {
            sField_TN = Toast.class.getDeclaredField("mTN");
            sField_TN.setAccessible(true);
            sField_TN_Handler = sField_TN.getType().getDeclaredField("mHandler");
            sField_TN_Handler.setAccessible(true);
        } catch (Exception e) {
            Log.d(TAG, "static initializer: "+e);
        }
    }

    private SafeToast() {
    }


    public static void show(Context context, CharSequence message, int duration) {
        if (mToast == null) {
            mToast = Toast.makeText(context.getApplicationContext(), message, duration);
            hook(mToast);
        } else {
            mToast.setDuration(duration);
            mToast.setText(message);
        }
        mToast.show();
    }

    public static void show(Context context, @StringRes int resId, int duration) {
        if (mToast == null) {
            mToast = Toast.makeText(context.getApplicationContext(), resId, duration);
            hook(mToast);
        } else {
            mToast.setDuration(duration);
            mToast.setText(context.getString(resId));
        }
        mToast.show();
    }

    private static void hook(Toast toast) {
        try {
            Object tn = sField_TN.get(toast);
            Handler preHandler = (Handler) sField_TN_Handler.get(tn);
            sField_TN_Handler.set(tn, new SafeHandler(preHandler));
        } catch (Exception e) {
            Log.d(TAG, "hook: "+e);
        }
    }


    private static class SafeHandler extends Handler {
        private Handler impl;

        public SafeHandler(Handler impl) {
            this.impl = impl;
        }

        @Override
        public void dispatchMessage(Message msg) {
            try {
                super.dispatchMessage(msg);
            } catch (Exception e) {
                Log.d(TAG, "hook: "+e);
            }
        }

        @Override
        public void handleMessage(Message msg) {
            impl.handleMessage(msg);//需要委托给原Handler执行
        }
    }
}

通过判断所用的手机sdk的api进行处理。
在api25之后，Google对toast进行了try catch处理。
在api25的时候Google没有捕获异常：

image.png

在api25之后进行了try catch

image.png