yangzm的专栏

https://blog.youkuaiyun.com/caoshen2014/article/details/100129281

本地发送消息的例子：package com.app;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.os.Bundle;import android.support.v4.content.LocalBroadcastManager;

定义抽象类：package com.example.myapplication;import android.app.Activity;public abstract class BackgroundTask { private Activity activity; public BackgroundTask(Activity activity) { this.activity = activity; } private void sta.

直接上代码：package com.xxxximport androidx.appcompat.app.AppCompatActivity;import androidx.core.content.FileProvider;import android.content.Context;import android.content.Intent;import android.content.pm.ApplicationInfo;import android.content.pm.Pac.