首次安装时无法获取 IMEI 号码

Question

我正在尝试获取 android device.I 的 IMEI 编号，我也可以获取它，但是应用程序在第一次安装时 return 没有 IMEI。我需要重新启动应用程序。谁能告诉我我哪里错了？提前致谢

    public class RootActivity extends AppCompatActivity {

    private static final int REQUEST_PERMISSION_PHONE_STATE = 1;
    TextView tv ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv = findViewById(R.id.TV_imei);
        tv.setText(showPhoneStatePermission());

    }private String showPhoneStatePermission() {
        String imei ="ERROR";
        int permissionCheck = ContextCompat.checkSelfPermission(
                this, Manifest.permission.READ_PHONE_STATE);
        if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.READ_PHONE_STATE}, REQUEST_PERMISSION_PHONE_STATE);
        } else {
            imei=getIMEI();
        }
        return imei;
    }

    private String  getIMEI() {
        TelephonyManager telephonyManager = (TelephonyManager) getApplicationContext().getSystemService(Context.TELEPHONY_SERVICE);
        @SuppressLint("MissingPermission") String deviceId = telephonyManager.getDeviceId().trim();
        return deviceId;
    }

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

}

Answer 1

tv.setText(showPhoneStatePermission()) 只会在 OnCreate() 中调用一次。在 onRequestPermissionsResult 中授予权限后，您没有设置 text 。您需要在 onRequestPermissionsResult 之后调用 setText()。您可以使用

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

如果这只是一个样本，那好吧。如果不是，那么您的代码中缺少权限处理。您也需要处理 Rational。看看

首次安装时无法获取 IMEI 号码

Can't get IMEI number on first install

android

imei