package com.secondworld.univeralsdk;
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import android.app.Activity;
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import android.annotation.TargetApi;
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import android.content.Context;
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import android.content.Intent;
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import android.content.pm.PackageManager;
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import android.os.Build;
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import android.os.Bundle;
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import android.support.annotation.NonNull;
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import android.support.v4.content.ContextCompat;
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import android.view.Gravity;
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import android.view.Window;
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import android.view.WindowManager;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Random;
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/**
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* Created by Administrator on 2019/10/20 0020.
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*/
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public class RequestPermissionsHelpActivity extends Activity
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{
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private int requestCode;
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//设计两个OnPermissionListener的原因是，有效缓解并发请求权限时，OnPermissionListener公用一个会引发回调错乱或没法回调的问题
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private static AppPermissionUtil.OnPermissionListener transferOnPermissionListener;//这个静态变量充当一个传递者的角色,传递给mOnPermissionListener变量后，就释放引用了
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private AppPermissionUtil.OnPermissionListener mOnPermissionListener;//这个才是我们每次权限请求使用的回调监听
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@Override
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protected void onCreate(Bundle savedInstanceState)
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{
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super.onCreate(savedInstanceState);
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//1像素的activity
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Window window = getWindow();
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window.setGravity(Gravity.LEFT | Gravity.TOP);
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WindowManager.LayoutParams params = window.getAttributes();
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params.x = 0;
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params.y = 0;
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params.height = 1;
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params.width = 1;
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window.setAttributes(params);
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//获取界面传过来的值
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getIntentData();
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}
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private void getIntentData()
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{
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//获取传递过来回调监听
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mOnPermissionListener = transferOnPermissionListener;
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transferOnPermissionListener = null;
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//传过来的需要申请的权限
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String[] permissions = getIntent().getStringArrayExtra("permissions");
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if (permissions != null && permissions.length > 0)
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{
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requestPermissions(permissions);
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}
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else
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{
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//手动报错提示
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throw new NullPointerException("申请的权限列表不能为空！");
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}
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}
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/**
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* 去申请所有权限
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*
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* @param permissions
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*/
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@TargetApi(Build.VERSION_CODES.M)
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private void requestPermissions(String[] permissions)
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{
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Random random = new Random();
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requestCode = random.nextInt(1000);
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List<String> deniedPermissions = getDeniedPermissions(permissions);
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if (deniedPermissions.size() > 0)
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{
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//没有授权过，去申请一下
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requestPermissions(deniedPermissions.toArray(new String[deniedPermissions.size()]),
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requestCode);
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}
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else
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{
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//都已经授权过了
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if (mOnPermissionListener != null)
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{
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mOnPermissionListener.onPermissionGranted();
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}
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if (!isFinishing())
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{
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finish();
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}
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}
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}
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/**
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* 请求权限结果
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*/
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public void requestPermissionsResult(int requestCode, int[] grantResults)
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{
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if (requestCode != -1 && requestCode == requestCode)
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{
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if (verifyPermissions(grantResults))
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{
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//都授权了
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if (mOnPermissionListener != null)
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{
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mOnPermissionListener.onPermissionGranted();
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}
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finish();
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}
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else
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{
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//有一个未授权或者多个未授权
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if (mOnPermissionListener != null)
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{
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mOnPermissionListener.onPermissionDenied();
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}
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finish();
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}
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}
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}
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@Override
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public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
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@NonNull int[] grantResults)
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{
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super.onRequestPermissionsResult(requestCode, permissions, grantResults);
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//申请权限结果返回
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requestPermissionsResult(requestCode, grantResults);
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}
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/**
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* 获取请求权限中需要授权的权限,有的可能已经授权过了
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*/
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private List<String> getDeniedPermissions(String[] permissions)
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{
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List<String> deniedPermissions = new ArrayList<>();
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for (String permission : permissions)
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{
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if (ContextCompat.checkSelfPermission(this,
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permission) == PackageManager.PERMISSION_DENIED)
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{
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deniedPermissions.add(permission);
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}
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}
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return deniedPermissions;
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}
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/**
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* 验证所有权限是否都已经授权
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*/
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private static boolean verifyPermissions(int[] grantResults)
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{
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for (int grantResult : grantResults)
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{
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if (grantResult != PackageManager.PERMISSION_GRANTED)
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{
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return false;
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}
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}
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return true;
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}
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@Override
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protected void onDestroy()
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{
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super.onDestroy();
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mOnPermissionListener = null;
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}
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/**
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* 启动activity，并带些必要参数过来
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*
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* @param context
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* @param permissions 申请权限列表
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* @param listener 结果回调
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*/
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public static void start(Context context, String[] permissions,
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AppPermissionUtil.OnPermissionListener listener)
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{
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Intent intent = new Intent(context, RequestPermissionsHelpActivity.class);
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intent.putExtra("permissions", permissions);
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intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
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context.startActivity(intent);
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transferOnPermissionListener = listener;
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}
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}
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