前言

Android权限申请之前写过，然后总结了下，但是后来忘记记录了，导致我再需要用的时候又得重来一次，很郁闷，这次就做个记录吧
本文参考我得另篇文章
6.0动态加载权限用PermissionGen

这篇文章主要讲解以下知识点

• 权限配置
• 权限类
• activity中调用

一.权限配置

在app的build.gradle中做库依赖:

    //PermissionGen
    compile 'com.lovedise:permissiongen:0.0.6'

二.权限类PermissionHelper代码

package com.example.pei.textdemo.permission;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Handler;
import android.os.Message;
import android.provider.Settings;

import java.lang.ref.WeakReference;

import kr.co.namee.permissiongen.PermissionGen;

/**
 * Title:权限配置
 * Description:
 * <p>
 * Created by pei
 * Date: 2017/9/20
 */
public class PermissionHelper {

    private static final int HANDLER_TAG=123;
    public static final int NORMAL_PERMISSION = 124;

    private Context mContext;
    private String mPermissions[];

    private Handler mHandler=new PermissionHandler(PermissionHelper.this);

    private PermissionHelper() {
    }

    private static class Holder {
        private static PermissionHelper instance = new PermissionHelper();
    }

    public static PermissionHelper getInstance() {
        return Holder.instance;
    }

    /**
     * 加基本权限
     **/
    public void checkPermissions(String permissions[],Context context) {
        this.mPermissions=permissions;
        this.mContext=context;

        new Thread(new Runnable() {
            @Override
            public void run() {
                mHandler.sendEmptyMessage(HANDLER_TAG);
            }
        }).start();
    }


    private void requestPermissions() {
        PermissionGen.with((Activity) mContext)
                .addRequestCode(NORMAL_PERMISSION)
                .permissions(mPermissions)
                .request();
    }


    /**
     * 重写activity的onRequestPermissionsResult方法，并在里面调用此方法
     *
     * @param requestCode
     * @param permissions
     * @param grantResults
     */
    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
        PermissionGen.onRequestPermissionsResult((Activity)mContext, requestCode, permissions, grantResults);
    }

    //自定义handler类
    static class PermissionHandler extends Handler {
        //弱引用(引用外部类)
        WeakReference<PermissionHelper> mCls;

        PermissionHandler(PermissionHelper cls) {
            //构造弱引用
            mCls = new WeakReference<PermissionHelper>(cls);
        }

        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            //通过弱引用获取外部类.
            PermissionHelper cls = mCls.get();
            //进行非空再操作
            if (cls != null) {
                switch (msg.what){
                    case HANDLER_TAG:
                        cls.requestPermissions();
                        removeMessages(HANDLER_TAG);
                        break;
                    default:
                        break;
                }
            }
        }
    }

}

三.activity中调用

package com.example.pei.textdemo.permission;

import android.Manifest;
import android.content.Context;
import android.content.Intent;
import android.support.annotation.NonNull;

import com.example.pei.textdemo.MainActivity;
import com.example.pei.textdemo.R;
import com.example.pei.textdemo.base.AppActivity;
import com.example.pei.textdemo.util.AppUtil;
import com.example.pei.textdemo.util.LogUtil;

import kr.co.namee.permissiongen.PermissionFail;
import kr.co.namee.permissiongen.PermissionSuccess;

/**
 * Title:
 * Description:
 * <p>
 * Created by pei
 * Date: 2017/9/26
 */
public class PermissionActivity extends AppActivity{

    public static Intent newIndexIntent(Context context) {
        Intent newIntent = new Intent(context, PermissionActivity.class);
        return newIntent;
    }

    @Override
    public int getContentViewId() {
        return R.layout.activity_permission;
    }

    @Override
    protected void initData() {
          String permissions[]={Manifest.permission.READ_EXTERNAL_STORAGE,
                                Manifest.permission.WRITE_EXTERNAL_STORAGE};
          PermissionHelper.getInstance().checkPermissions(permissions,mContext);
    }

    @Override
    protected void setListener(){

    }

    @PermissionSuccess(requestCode = PermissionHelper.NORMAL_PERMISSION)
    public void requestSuccess(){
        //检测版本
        LogUtil.e("=====检测版本=======");

        startActivity(MainActivity.newIndexIntent(mContext));
    }

    @PermissionFail(requestCode = PermissionHelper.NORMAL_PERMISSION)
    public void requestFail(){
        //不给权限就退出
        LogUtil.e("=====失败了=======");
        AppUtil.goToSetting(mContext);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[], @NonNull int[] grantResults) {
           PermissionHelper.getInstance().onRequestPermissionsResult(requestCode, permissions, grantResults);
    }
}

我这里是以获取读写权限为例，当然，你还得在mainfast中添加读写权限

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

ok，今天关于权限得知识就讲到这里吧