权限申请帮助类（百度定位）

package com.example.mycitylocation;

import android.Manifest;
import android.app.Activity;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.provider.Settings;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AlertDialog;

/**
* 类描述：权限申请帮助类
* 创建日期： 2017/3/20 0020 下午 4:36
* 更新日期：
*/
public class PermissionHelper {

private PermissionModel[] permissionModels = {
new PermissionModel(1, Manifest.permission.READ_PHONE_STATE, "识别身份"),
new PermissionModel(2, Manifest.permission.ACCESS_FINE_LOCATION, "定位"),
new PermissionModel(3, Manifest.permission.ACCESS_COARSE_LOCATION, "定位"),
new PermissionModel(3, Manifest.permission.WRITE_EXTERNAL_STORAGE, "定位"),
};
private Activity activity;
private OnAlterApplyPermission listener;

public PermissionHelper(Activity activity) {

this.activity = activity;
}

/**
* 申请的权限是否全部授予过
*
* @return true:全部授予了
*/
public boolean isAllApplyPermission() {
if (permissionModels != null && permissionModels.length != 0) {
for (PermissionModel permissionModel : permissionModels) {
if (ContextCompat.checkSelfPermission(activity, permissionModel.permission) != PackageManager.PERMISSION_GRANTED) {
return false;
}
}
return true;
}
return false;
}

/**
* 动态申请权限
*/
public void applyPermission() {
for (PermissionModel permissionModel : permissionModels) {
//如果没有授予过，再申请
if (ContextCompat.checkSelfPermission(activity, permissionModel.permission) != PackageManager.PERMISSION_GRANTED) {
//申请
ActivityCompat.requestPermissions(activity, new String[]{permissionModel.permission}, permissionModel.requestCode);
return;
}
}
if (listener != null) listener.OnAlterApplyPermission();

}

/**
* 根据权限获取对应的说明
*
* @param permission
* @return
*/
private String findPermissionExplain(String permission) {
for (PermissionModel permissionModel : permissionModels) {
if (permissionModel.permission.equals(permission)) {
return permissionModel.explain;
}
}
return "";
}

public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
if (grantResults[0] != PackageManager.PERMISSION_GRANTED) {//用户没有同意
//二次申请，二次申请的时候回多一个"不再提示"的checkBox
//二次申请的时候需要告诉用户为什么需要这权限
if (ActivityCompat.shouldShowRequestPermissionRationale(activity, permissions[0])) {//用户拒绝了
AlertDialog.Builder builder = new AlertDialog.Builder(activity).setTitle("权限申请")
.setMessage(findPermissionExplain(permissions[0]))
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
applyPermission();
}
});
builder.setCancelable(false);
builder.show();
} else {
//引导用户去应用设置页面手动开启权限
AlertDialog.Builder builder = new AlertDialog.Builder(activity).setTitle("权限申请")
.setMessage("在应用设置页面打开：" + findPermissionExplain(permissions[0]) + "权限")
.setPositiveButton("去设置", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
openAppPermissionSettrings();
}

})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
activity.finish();
}
});
builder.setCancelable(false);
builder.show();
}
return;
}
if (isAllApplyPermission() && listener != null) {
listener.OnAlterApplyPermission();
} else {
applyPermission();
}
}

/**
* 打开应用的设置界面
*/
private void openAppPermissionSettrings() {
Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS, Uri.parse("package:" + activity.getPackageName()));
intent.addCategory(Intent.CATEGORY_DEFAULT);
activity.startActivityForResult(intent, 3);

}

public static class PermissionModel {
String permission;
String explain;
int requestCode;

public PermissionModel(int requestCode, String permission, String explain) {
this.permission = permission;
this.explain = explain;
this.requestCode = requestCode;
}
}

public void setOnAlterApplyPermission(OnAlterApplyPermission listener) {

this.listener = listener;
}

public interface OnAlterApplyPermission {
void OnAlterApplyPermission();
}

public void onActivityResult(int requestCode, int resultCode, Intent data) {

if (isAllApplyPermission() && listener != null) {
listener.OnAlterApplyPermission();
} else {
applyPermission();
}

}
}