封装一个MPermissionsActivity的思路和步骤

http://blog.csdn.net/longkehuawei/article/details/53202804

第一步：检测所有的权限是否都已授权

/**
* 检测所有的权限是否都已授权
*
* @param permissions
* @return
*/
private boolean checkPermissions(String[] permissions) {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
return true;
}

for (String permission : permissions) {
if (ContextCompat.checkSelfPermission(this, permission) !=
PackageManager.PERMISSION_GRANTED) {
return false;
}
}
return true;
}

第二步：获取权限集中需要申请权限的列表

/**
* 获取权限集中需要申请权限的列表
*
* @param permissions
* @return
*/
private List<String> getDeniedPermissions(String[] permissions) {
List<String> needRequestPermissionList = new ArrayList<>();
for (String permission : permissions) {
if (ContextCompat.checkSelfPermission(this, permission) !=
PackageManager.PERMISSION_GRANTED ||
ActivityCompat.shouldShowRequestPermissionRationale(this, permission)) {
needRequestPermissionList.add(permission);
}
}
return needRequestPermissionList;
}

第三步：请求权限

/**
* 请求权限
*
* @param permissions 请求的权限
* @param requestCode 请求权限的请求码
*/
public void requestPermission(String[] permissions, int requestCode) {
this.REQUEST_CODE_PERMISSION = requestCode;
if (checkPermissions(permissions)) {
permissionSuccess(REQUEST_CODE_PERMISSION);
} else {
List<String> needPermissions = getDeniedPermissions(permissions);
ActivityCompat.requestPermissions(this, needPermissions.toArray(new String[needPermissions.size()]), REQUEST_CODE_PERMISSION);
}
}

第四步：处理权限请求回调

/**
* 系统请求权限回调
*
* @param requestCode
* @param permissions
* @param grantResults
*/
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == REQUEST_CODE_PERMISSION) {
if (verifyPermissions(grantResults)) {
permissionSuccess(REQUEST_CODE_PERMISSION);
} else {
permissionFail(REQUEST_CODE_PERMISSION);
showTipsDialog();
}
}
}

第五步：查看处理权限请求回调用户是否已经授权

/**
* 确认所有的权限是否都已授权
*
* @param grantResults
* @return
*/
private boolean verifyPermissions(int[] grantResults) {
for (int grantResult : grantResults) {
if (grantResult != PackageManager.PERMISSION_GRANTED) {
return false;
}
}
return true;
}

第六步：授权成功处理函数

/**
* 获取权限成功
*
* @param requestCode
*/
public void permissionSuccess(int requestCode) {
Log.d(TAG, "获取权限成功=" + requestCode);

}

第七步：授权失败处理函数与弹出用户提示

/**
* 权限获取失败
* @param requestCode
*/
public void permissionFail(int requestCode) {
Log.d(TAG, "获取权限失败=" + requestCode);
}

/**
* 显示提示对话框
*/
private void showTipsDialog() {
new AlertDialog.Builder(this)
.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", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
})
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
startAppSettings();
}
}).show();
}

第八步：授权失败给用户提示后想再次开启跳到设置app权限界面

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