获取来电号码？

Question

i am developing a app that gets the incoming calling number .

this is my code through which i am trying to do this .

package com.example.callchecker;

import android.os.Bundle;
import android.app.Activity ;
import android.content.Context;
import android.telephony.*;
import android.view.Menu;
import android.widget.TextView;
import android.widget.Toast;

public class Main_Activity extends Activity {
    String number;
    TextView tv1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_layout);
        tv1=(TextView) findViewById(R.id.textView1);

        TelephonyManager telephonymanager =
            (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
        //register phone state
        PhoneStateListener callstatelestener = new PhoneStateListener() {
            public void OnCallStateChanged(int state , String incomingNumber) {
                number = incomingNumber;
                tv1.setText(number);
                // If phone ringing
                if(state==TelephonyManager.CALL_STATE_RINGING)
                {
                    Toast.makeText(getApplicationContext(), "Phone Is Riging",
                            Toast.LENGTH_LONG).show();
                }
            }
        };

        telephonymanager.listen(callstatelestener,
                PhoneStateListener.LISTEN_CALL_STATE);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
            // Inflate the menu; this adds items to the action bar if it is present.
            getMenuInflater().inflate(R.menu.main_layout, menu);
            return true;
    }
}

but this do not do any thing even when the call is make when i am in this app ... weather i have to make it working in background all the time ????? and if this is the right way to get the incoming number ???

Answer 1

您将在此广泛的教程中找到解决问题所需的所有答案： http : //www.vogella.com/articles/AndroidBroadcastReceiver/article.html