Android-在Samsung设备上使用USSD API运行USSD *＃0011＃

Question

最近，我和我的家人搬到了一所新房子，我们的电话服务出现问题。经过所有隔离，我有一个备用的大声笑，我开始开发android应用。我读到有关如何检查信号强度的信息（我们都有三星设备），并且遇到了USSD代码*＃0011＃。经过一天的研究，我找到了USSD API，并开始编写一个应用程序，该应用程序最终将（向我的手机）显示单元的信号强度。当我发送USSD代码时，回调总是失败，将调用onReceiveUssdResponseFailed（）。有帮助吗？

public class MainActivity extends AppCompatActivity {

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

        requestPermissions(new String[]{Manifest.permission.CALL_PHONE}, 0);

        TelephonyManager telephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
        Handler handler = new Handler();

        TelephonyManager.UssdResponseCallback responseCallback = new TelephonyManager.UssdResponseCallback() {
            @Override
            public void onReceiveUssdResponse(TelephonyManager telephonyManager, String request, CharSequence response) {
                super.onReceiveUssdResponse(telephonyManager, request, response);

                Toast.makeText(MainActivity.this, "Success", Toast.LENGTH_LONG).show();
            }

            @Override
            public void onReceiveUssdResponseFailed(TelephonyManager telephonyManager, String request, int failureCode) {
                super.onReceiveUssdResponseFailed(telephonyManager, request, failureCode);

                Toast.makeText(MainActivity.this, "Failed " + request, Toast.LENGTH_LONG).show();

            }
        };

        try {
            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
                // TODO: Consider calling
                //    ActivityCompat#requestPermissions
                // here to request the missing permissions, and then overriding
                //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                //                                          int[] grantResults)
                // to handle the case where the user grants the permission. See the documentation
                // for ActivityCompat#requestPermissions for more details.
                return;
            }
            telephonyManager.sendUssdRequest("*#0011#", responseCallback, handler);
        } catch (NullPointerException e){
            e.printStackTrace();
        }
    }
}

Answer 1

Evelop android apps。我读到有关如何检查信号强度的信息（我们都有三星设备），并且遇到了USSD代码*＃0011＃。经过一天的研究，我找到了USSD API，并开始编写一个应用程序，该应用程序最终将（向我的手机）显示单元的信号强度。当我发送USSD代码时，回调总是失败，将调用onReceiveUssdResponseFailed（）。有帮助吗？

public class MainActivity extends AppCompatActivity {

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

        requestPermissions(new String[]{Manifest.permission.CALL_PHONE}, 0);

        TelephonyManager telephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
        Handler handler = new Handler();

        TelephonyManager.UssdResponseCallback responseCallback = new TelephonyManager.UssdResponseCallback() {
            @Override
            public void onReceiveUssdResponse(TelephonyManager telephonyManager, String request, CharSequence response) {
                super.onReceiveUssdResponse(telephonyManager, request, response);

                Toast.makeText(MainActivity.this, "Success", Toast.LENGTH_LONG).show();
            }

            @Override
            public void onReceiveUssdResponseFailed(TelephonyManager telephonyManager, String request, int failureCode) {
                super.onReceiveUssdResponseFailed(telephonyManager, request, failureCode);

                Toast.makeText(MainActivity.this, "Failed " + request, Toast.LENGTH_LONG).show();

            }
        };

        try {
            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
                // TODO: Consider calling
                //    ActivityCompat#requestPermissions
                // here to request the missing permissions, and then overriding
                //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                //                                          int[] grantResults)
                // to handle the case where the user grants the permission. See the documentation
                // for ActivityCompat#requestPermissions for more details.
                return;
            }
            telephonyManager.sendUssdRequest("*#0011#", responseCallback, handler);
        } catch (NullPointerException e){
            e.printStackTrace();
        }
    }
}