Question

我要构建的Android应用是短信投票应用。为了解释我的项目，

我的MainActivity应该从RedirectActivity接收SMS数据，并识别它是1还是2，然后递增变量numOf1或numOf2以及total。

public class MainActivity extends AppCompatActivity {

    private int numOf1 = 0;
    private int numOf2 = 0;
    private int sum = 0;
    private TextView number1 ;
    private TextView number2 ;
    private TextView total;
    @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);
        String data= getIntent().getStringExtra("text");
        if(data.equals("1")){
            numOf1++;
            number1.setText(Integer.toString(numOf1));
        }
        else if(data.equals("2")){
            numOf2++;
            number2.setText(Integer.toString(numOf2));
        }
        sum = numOf1 + numOf2;
        total.setText(Integer.toString(sum));
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        number1 = (TextView)findViewById(R.id.number1);
        number2 = (TextView)findViewById(R.id.number2);
        total = (TextView)findViewById(R.id.total);
    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu, menu);
        return super.onCreateOptionsMenu(menu);

    }


    public boolean onOptionItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.set:
                startActivity(new Intent(MainActivity.this, setting.class));
                break;
        }
        return true;
    }
}

RedirectActivity将通过SMSReceiver类的Intent接收SMS数据。

public class RedirectActivity extends Activity {
    @Override

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Intent intent = getIntent();
        String text = intent.getStringExtra("text");


        Intent i = new Intent(this, MainActivity.class);
        i.putExtra("text", text);
        startActivity(i);

    }

}

SMSReceiver类

public class SMSReceiver extends BroadcastReceiver {
    static final String logTag = "SmsReceiver";
    static final String ACTION = "android.provider.Telephony.SMS_RECEIVED";

    @Override

    public void onReceive(Context context, Intent intent) {
        Bundle bundle = intent.getExtras();
        SmsMessage[] msgs = null;
        String str = "";
        if (bundle != null)
        {
            Object[] pdus = (Object[]) bundle.get("pdus");
            msgs = new SmsMessage[pdus.length];
            for (int i=0; i<msgs.length; i++){
                msgs[i] = SmsMessage.createFromPdu((byte[])pdus[i]);
                str += msgs[i].getMessageBody().toString();
            }

            Intent i=new Intent(context,RedirectActivity.class);
            i.putExtra("text", str);
            context.startActivity(i);

        }

    }
}

我遇到的问题是，每当我通过localhost 5554发送带有1或2的消息并接收它时，我的应用程序根本不算数。

我该如何解决？：d

Answer 1

我建议将onNewIntent()中的MainActivity内的代码移至onCreate

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    number1 = (TextView)findViewById(R.id.number1);
    number2 = (TextView)findViewById(R.id.number2);
    total = (TextView)findViewById(R.id.total);

    String data= getIntent().getStringExtra("text");
    if(data.equals("1")){
        numOf1++;
        number1.setText(Integer.toString(numOf1));
    }
    else if(data.equals("2")){
        numOf2++;
        number2.setText(Integer.toString(numOf2));
    }
    sum = numOf1 + numOf2;
    total.setText(Integer.toString(sum));

}

但是onNewIntent中的代码无效，因为您没有调用setIntent(intent)。在致电setIntent(intent)之前，您应致电getInent()。

 @Override
protected void onNewIntent(Intent intent) {
    super.onNewIntent(intent);
    setIntent(intent);
    ...

}

有关onNewIntent() Here

的详细信息，请参阅此处

我希望这会有所帮助。

如何计算来自短信的已保存数据并在Textview

1 个答案: