import com.afollestad.assent.AssentCallback; //导入依赖的package包/类
public void grantExternalStoragePermission() {
    if (!Assent.isPermissionGranted(Assent.WRITE_EXTERNAL_STORAGE)) {
        Assent.requestPermissions(new AssentCallback() {
            @Override
            public void onPermissionResult(PermissionResultSet result) {
                if (result.isGranted(Assent.WRITE_EXTERNAL_STORAGE)) {
                    startDownload();
                } else {
                    Snackbar.make(ivPreview, R.string.please_accept_write_external_storage_permission, Snackbar.LENGTH_LONG).show();
                }
            }
        }, 5, Assent.WRITE_EXTERNAL_STORAGE);
    } else {
        startDownload();
    }
}
 

import com.afollestad.assent.AssentCallback; //导入依赖的package包/类
private void grantExternalStoragePermission() {
    if (!Assent.isPermissionGranted(Assent.WRITE_EXTERNAL_STORAGE)) {
        Assent.requestPermissions(new AssentCallback() {
            @Override
            public void onPermissionResult(PermissionResultSet result) {
                if (result.isGranted(Assent.WRITE_EXTERNAL_STORAGE)) {
                    startDownload();
                } else {
                    Snackbar.make(ivPreview, R.string.please_accept_write_external_storage_permission, Snackbar.LENGTH_LONG).show();
                }
            }
        }, 5, Assent.WRITE_EXTERNAL_STORAGE);
    } else {
        startDownload();
    }
}
 

import com.afollestad.assent.AssentCallback; //导入依赖的package包/类
private void askPermissions() {
    if (mPermissionsAsked)
        return;

    if (!Assent.isPermissionGranted(Assent.READ_CONTACTS) ||
        !Assent.isPermissionGranted(Assent.WRITE_CONTACTS)) {
        Assent.requestPermissions(new AssentCallback() {
            @Override
            public void onPermissionResult(PermissionResultSet result) {
                // we can go by write contacts denied, but not read contacts
                if (!result.isGranted(Assent.READ_CONTACTS)) {
                    // just notify the user for now, we'll ask again later
                    error(R.string.err_validation_contacts_denied);
                }
            }
        }, REQUEST_PERMISSIONS, Assent.READ_CONTACTS, Assent.WRITE_CONTACTS);
        mPermissionsAsked = true;
    }
}
 

import com.afollestad.assent.AssentCallback; //导入依赖的package包/类
private void requestLocationPermission() {
    Assent.requestPermissions(new AssentCallback() {
        @Override
        public void onPermissionResult(PermissionResultSet permissionResultSet) {
            // Intentionally left blank
        }
    }, PERMISSION_COARSE_LOCATION, Assent.ACCESS_COARSE_LOCATION);
}
 

import com.afollestad.assent.AssentCallback; //导入依赖的package包/类
private void requestLocationPermission() {
    requestPermission(new String[]{Assent.ACCESS_COARSE_LOCATION, Assent.ACCESS_FINE_LOCATION}, new AssentCallback() {
        @Override
        public void onPermissionResult(PermissionResultSet permissionResultSet) {
            if (!permissionResultSet.allPermissionsGranted()) {
                finish();
                Toast.makeText(MainActivity.this, "You must grant location permission.", Toast.LENGTH_SHORT).show();
            }
        }
    });
}
 

import com.afollestad.assent.AssentCallback; //导入依赖的package包/类
private void requestWriteStoragePermission() {
    Assent.requestPermissions(new AssentCallback() {
        @Override
        public void onPermissionResult(PermissionResultSet permissionResultSet) {
            // Intentionally left blank
        }
    }, PERMISSION_WRITE_EXTERNAL_STORAGE, Assent.WRITE_EXTERNAL_STORAGE);
}
 

import com.afollestad.assent.AssentCallback; //导入依赖的package包/类
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  mStatus = (TextView) findViewById(R.id.status);

  if (Assent.isPermissionGranted(Assent.WRITE_EXTERNAL_STORAGE)) {
    mStatus.setText(R.string.permission_granted);
  } else {
    mStatus.setText(R.string.permission_is_not_granted);
  }

  findViewById(R.id.requestPermission)
      .setOnClickListener(
          new View.OnClickListener() {
            @Override
            public void onClick(View v) {
              Assent.requestPermissions(
                  new AssentCallback() {
                    @Override
                    public void onPermissionResult(PermissionResultSet result) {
                      if (result.allPermissionsGranted())
                        mStatus.setText(R.string.permission_granted);
                      else mStatus.setText(R.string.permission_is_not_granted);
                    }
                  },
                  69,
                  Assent.WRITE_EXTERNAL_STORAGE);
            }
          });
}
 

import com.afollestad.assent.AssentCallback; //导入依赖的package包/类
private void requestPermission(String[] permissions, AssentCallback callback) {
    int requestCode = new Random().nextInt(100);
    Assent.requestPermissions(callback, requestCode, permissions);
}