• googlesamples (来自google教科书)
  Easypermissions

1. 添加依赖

build.gradle

dependencies {
    compile 'pub.devrel:easypermissions:0.2.1'
}

2. 涉及到权限的activity或fragment实现PermissionCallbacks 接口.

public class UserActivity extends AppCompatActivity
    implements EasyPermissions.PermissionCallbacks {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

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

        // 将权限处理转交给EasyPermissions
        EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this);
    }

    /**
    *具体的涉及敏感权限的法.REQUEST_CODE_PERMISSION_PHOTO_PICKER用来*标识此权限是否被用户准许,回调至Granted or Denied方法内.
    */

     @AfterPermissionGranted(REQUEST_CODE_PERMISSION_PHOTO_PICKER) 
     private void choicePhotoWrapper() {
    // 被申请的权限数组
        String[] perms = { Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.CAMERA };
        if (EasyPermissions.hasPermissions(this, perms)) {
        // 具体的操作方法(此处用打开相机来说明)
        Intent intent = newIntent(MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(intent,TAKE_PHOTO_WITH_DATA);
    } else {
      EasyPermissions.requestPermissions(this, "相机需要以下权限:\n\n1.访问设备上的照片",
          REQUEST_CODE_PERMISSION_PHOTO_PICKER, perms);
    }
  }

    @Override
    public void onPermissionsGranted(int requestCode, List<String> list) {
        // Some permissions have been granted
        // 某些权限被允许后的回调...
    }

    @Override public void onPermissionsDenied(int requestCode, List<String> list) {
    // Some permissions have been denied
    // 用户拒绝此权限后的操作...(弹出Dialog提示用户手动设置开启)
    if (requestCode == REQUEST_CODE_PERMISSION_PHOTO_PICKER) {
      Toast.makeText(this, "您拒绝了「打开相机」所需要的相关权限!", Toast.LENGTH_SHORT).show();
    }
    if (EasyPermissions.somePermissionPermanentlyDenied(this, perms)) {
      new AppSettingsDialog.Builder(this, getString(R.string.rationale_ask_again)).setTitle(
          getString(R.string.title_settings_dialog))
          .setPositiveButton(getString(R.string.setting))
          .setNegativeButton(getString(R.string.cancel), null /* click listener */)
          .setRequestCode(RC_SETTINGS_SCREEN)
          .build()
          .show();
    }
  }
}

3. 其他更好的实现

Hongyang大神的实现