Android 应用适配 Android 7.0 权限要求详解

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);  } }}