Android(安卓)解决Toast出现has already been added to the window manager崩溃问题

一般应用中会将Toast封装为一个工具类使用，但某些情况下调用Toast会出现 has already added to the window manager 导致程序崩溃问题

需要如下处理：

package com.example.toast.util;import android.os.Handler;import android.os.Message;import android.support.annotation.NonNull;import android.support.annotation.StringRes;import android.widget.Toast;import com.example.vlike.VLikeApplication;import java.lang.reflect.Field;public class ToastUtils {         private static Field sFieldTN;    private static Field sFieldTNHandler;    static {             try {                 sFieldTN = Toast.class.getDeclaredField("mTN");            sFieldTN.setAccessible(true);            sFieldTNHandler = sFieldTN.getType().getDeclaredField("mHandler");            sFieldTNHandler.setAccessible(true);        } catch (Exception e) {                 e.printStackTrace();        }    }    private static void hook(Toast toast) {             try {                 Object tn = sFieldTN.get(toast);            Handler preHandler = (Handler) sFieldTNHandler.get(tn);            sFieldTNHandler.set(tn, new SafelyHandlerWrapper(preHandler));        } catch (Exception e) {                 e.printStackTrace();        }    }    private static class SafelyHandlerWrapper extends Handler {             private Handler impl;        SafelyHandlerWrapper(Handler impl) {                 this.impl = impl;        }        @Override        public void dispatchMessage(Message msg) {                 try {                     super.dispatchMessage(msg);            } catch (Exception e) {                     e.printStackTrace();            }        }        @Override        public void handleMessage(Message msg) {                 impl.handleMessage(msg);        }    }    public static void showToast(@StringRes int id) {             showToast(VLikeApplication.getContext().getResources().getString(id), Toast.LENGTH_SHORT);    }    public static void showToast(@StringRes int id, int duration) {             showToast(VLikeApplication.getContext().getResources().getString(id), duration);    }    public static void showToast(@NonNull String msg) {             showToast(msg, Toast.LENGTH_SHORT);    }    public static void showToast(@NonNull String msg, int duration) {             Toast toast = Toast.makeText(VLikeApplication.getContext(), msg, duration);        // 在调用Toast.show()之前处理:        hook(toast);        toast.show();    }}

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