public class AppMainActivity extends AppCompatActivity {
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  //在App中需要请求权限才能执行用户的操作
  getPermissionToReadUserContacts();
 }
 //定义请求
 private static final int READ_CONTACTS_REQUEST = 1;
 //当用户执行的操作需要权限时候进行询问
 public void getPermissionToReadUserContacts() {
  /**
   * 1)使用ContextCompat.chefkSelfPermission(),因为Context.permission
   * 只在棒棒糖系统中使用
   * 2）总是检查权限（即使权限被授予）因为用户可能会在设置中移除你的权限*/
  if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
    != PackageManager.PERMISSION_GRANTED ||
    ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE)
      != PackageManager.PERMISSION_GRANTED ||
    ContextCompat.checkSelfPermission(this, Manifest.permission.READ_PHONE_STATE)
      != PackageManager.PERMISSION_GRANTED) {

   //权限为获取，检查用户是否被询问过并且拒绝了，如果是这样的话，给予更多
   //解释
   if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_FINE_LOCATION) ||
     ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.READ_EXTERNAL_STORAGE) ||
     ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.READ_PHONE_STATE)) {
    //在界面上展示为什么需要读取联系人
    Toast.makeText(this, "需要定位位置权限,手机电话权限和存储权限才可以正常工作", Toast.LENGTH_SHORT).show();
   }
   //发起请求获得用户许可,可以在此请求多个权限
   ActivityCompat.requestPermissions(this, new String[]{
       Manifest.permission.ACCESS_FINE_LOCATION,
       Manifest.permission.READ_EXTERNAL_STORAGE,
       Manifest.permission.READ_PHONE_STATE},
     READ_CONTACTS_REQUEST);
  }
 }
 //从requestPermissions()方法回调结果
 @Override
 public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
  //确保是我们的请求
  if (requestCode == READ_CONTACTS_REQUEST) {
   if (grantResults.length == 3 && grantResults[0] == PackageManager.PERMISSION_GRANTED
     && grantResults[1] == PackageManager.PERMISSION_GRANTED
       && grantResults[2] == PackageManager.PERMISSION_GRANTED) {
    System.out.println("应用权限获取成功");
   } else {
    System.out.println("应用权限获取失败");
   }
  } else {
   super.onRequestPermissionsResult(requestCode, permissions, grantResults);
  }
 }
}