public class AppMainActivity extends AppCompatActivity {
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  //在App中需要請求權限才能執行用戶的操作
  getPermissionToReadUserContacts();
 }
 //定義請求
 private static final int READ_CONTACTS_REQUEST = 1;
 //當用戶執行的操作需要權限時候進行詢問
 public void getPermissionToReadUserContacts() {
  /**
   * 1)使用ContextCompat.chefkSelfPermission(),因為Context.permission
   * 只在棒棒糖系統中使用
   * 2）總是檢查權限（即使權限被授予）因為用戶可能會在設置中移除你的權限*/
  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) {

   //權限為獲取，檢查用戶是否被詢問過并且拒絕了，如果是這樣的話，給予更多
   //解釋
   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)) {
    //在界面上展示為什么需要讀取聯系人
    Toast.makeText(this, "需要定位位置權限,手機電話權限和存儲權限才可以正常工作", Toast.LENGTH_SHORT).show();
   }
   //發起請求獲得用戶許可,可以在此請求多個權限
   ActivityCompat.requestPermissions(this, new String[]{
       Manifest.permission.ACCESS_FINE_LOCATION,
       Manifest.permission.READ_EXTERNAL_STORAGE,
       Manifest.permission.READ_PHONE_STATE},
     READ_CONTACTS_REQUEST);
  }
 }
 //從requestPermissions()方法回調結果
 @Override
 public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
  //確保是我們的請求
  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("應用權限獲取成功");
   } else {
    System.out.println("應用權限獲取失敗");
   }
  } else {
   super.onRequestPermissionsResult(requestCode, permissions, grantResults);
  }
 }
}