高仿微信-微信EM开发流程--（3）Android6.0动态权限申请

Android 6.0版本(Api 23)推出了很多新的特性, 大幅提升了用户体验, 同时也为程序员带来新的负担.
动态权限管理就是这样, 一方面让用户更加容易的控制自己的隐私, 一方面需要重新适配应用权限. 时代总是不断发展, 程序总是以人为本, 让我们为应用添加动态权限管理吧! 这里提供了一个非常不错的解决方案, 提供源码, 项目可以直接使用.

/**
* Created by zhouyou on 2016/11/17.
* Class desc:
*
* 6.0 运行时权限处理工具类。
*/
public class MPermissionUtils {

private static int mRequestCode = -1;

public static void requestPermissionsResult(Activity activity, int requestCode
, String[] permission, OnPermissionListener callback){
requestPermissions(activity, requestCode, permission, callback);
}

public static void requestPermissionsResult(android.app.Fragment fragment, int requestCode
, String[] permission, OnPermissionListener callback){
requestPermissions(fragment, requestCode, permission, callback);
}

public static void requestPermissionsResult(android.support.v4.app.Fragment fragment, int requestCode
, String[] permission, OnPermissionListener callback){
requestPermissions(fragment, requestCode, permission, callback);
}

/**
* 请求权限处理
* @param object        activity or fragment
* @param requestCode   请求码
* @param permissions   需要请求的权限
* @param callback      结果回调
*/
@TargetApi(Build.VERSION_CODES.M)
private static void requestPermissions(Object object, int requestCode
, String[] permissions, OnPermissionListener callback){

checkCallingObjectSuitability(object);
mOnPermissionListener = callback;

if(checkPermissions(getContext(object), permissions)){
if(mOnPermissionListener != null)
mOnPermissionListener.onPermissionGranted();
}else{
List<String> deniedPermissions = getDeniedPermissions(getContext(object), permissions);
if(deniedPermissions.size() > 0){
mRequestCode = requestCode;

if(object instanceof Activity){
((Activity) object).requestPermissions(deniedPermissions
.toArray(new String[deniedPermissions.size()]), requestCode);
}else if(object instanceof android.app.Fragment){
((android.app.Fragment) object).requestPermissions(deniedPermissions
.toArray(new String[deniedPermissions.size()]), requestCode);
}else if(object instanceof android.support.v4.app.Fragment){
((android.support.v4.app.Fragment) object).requestPermissions(deniedPermissions
.toArray(new String[deniedPermissions.size()]), requestCode);
}
}
}
}

/**
* 获取上下文
*/
private static Context getContext(Object object) {
Context context;
if(object instanceof android.app.Fragment){
context = ((android.app.Fragment) object).getActivity();
}else if(object instanceof android.support.v4.app.Fragment){
context = ((android.support.v4.app.Fragment) object).getActivity();
}else{
context = (Activity) object;
}
return context;
}

/**
* 请求权限结果，对应onRequestPermissionsResult()方法。
*/
public static void <
debd
/span>onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
if(requestCode == mRequestCode){
if(verifyPermissions(grantResults)){
if(mOnPermissionListener != null)
mOnPermissionListener.onPermissionGranted();
}else{
if(mOnPermissionListener != null)
mOnPermissionListener.onPermissionDenied();
}
}
}

/**
* 显示提示对话框
*/
public static void showTipsDialog(final Context context) {
new AlertDialog.Builder(context)
.setTitle("提示信息")
.setMessage("当前应用缺少必要权限，该功能暂时无法使用。如若需要，请单击【确定】按钮前往设置中心进行权限授权。")
.setNegativeButton("取消", null)
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
startAppSettings(context);
}
}).show();
}

/**
* 启动当前应用设置页面
*/
private static void startAppSettings(Context context) {
Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
intent.setData(Uri.parse("package:" + context.getPackageName()));
context.startActivity(intent);
}

/**
* 验证权限是否都已经授权
*/
private static boolean verifyPermissions(int[] grantResults) {
// 如果请求被取消，则结果数组为空
if(grantResults.length <= 0)
return false;

// 循环判断每个权限是否被拒绝
for (int grantResult : grantResults) {
if (grantResult != PackageManager.PERMISSION_GRANTED) {
return false;
}
}
return true;
}

/**
* 获取权限列表中所有需要授权的权限
* @param context       上下文
* @param permissions   权限列表
* @return
*/
private static List<String> getDeniedPermissions(Context context, String... permissions){
List<String> deniedPermissions = new ArrayList<>();
for (String permission : permissions) {
if(ContextCompat.checkSelfPermission(context, permission) == PackageManager.PERMISSION_DENIED){
deniedPermissions.add(permission);
}
}
return deniedPermissions;
}

/**
* 检查所传递对象的正确性
* @param object 必须为 activity or fragment
*/
private static void checkCallingObjectSuitability(Object object) {
if (object == null) {
throw new NullPointerException("Activity or Fragment should not be null");
}

boolean isActivity = object instanceof Activity;
boolean isSupportFragment = object instanceof android.support.v4.app.Fragment;
boolean isAppFragment = object instanceof android.app.Fragment;

if(!(isActivity || isSupportFragment || isAppFragment)){
throw new IllegalArgumentException(
"Caller must be an Activity or a Fragment");
}
}

/**
* 检查所有的权限是否已经被授权
* @param permissions 权限列表
* @return
*/
private static boolean checkPermissions(Context context, String... permissions){
if(isOverMarshmallow()){
for (String permission : permissions) {
if(ContextCompat.checkSelfPermission(context, permission) == PackageManager.PERMISSION_DENIED){
return false;
}
}
}
return true;
}

/**
* 判断当前手机API版本是否 >= 6.0
*/
private static boolean isOverMarshmallow() {
return Build.VERSION.SDK_INT >= Build.VERSION_CODES.M;
}

public interface OnPermissionListener{
void onPermissionGranted();
void onPermissionDenied();
}

private static OnPermissionListener mOnPermissionListener;
}

这是一个动态获取权限的工具类，可以直接在项目中使用，我是在BaseActivity中直接调用

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

这样就不必在所有活动中重写这个方法。

之后，在项目你想要获取权限的地方直接调用.requestPermissionResult()方法，在onPermissionGranted方法中写权限通过的代码，onPermissionDenied写权限被拒绝的代码。

MPermissionUtils.requestPermissionsResult(this, 1, new String[]{你想要申请的权限}
, new MPermissionUtils.OnPermissionListener() {
@Override
public void onPermissionGranted() {
//权限申请通过
 
}

@Override
public void onPermissionDenied() {
//权限被拒绝，显示对话框
 
}
});