MainActivity.java Source code

Introduction

Here is the source code for MainActivity.java

Source

import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    PhoneStateListener mPhoneStateListener = new PhoneStateListener() {
        @Override
        public void onCallStateChanged(int state, String number) {
            String phoneState = number;
            switch (state) {
            case TelephonyManager.CALL_STATE_IDLE:
                phoneState += "CALL_STATE_IDLE\n";
            case TelephonyManager.CALL_STATE_RINGING:
                phoneState += "CALL_STATE_RINGING\n";
            case TelephonyManager.CALL_STATE_OFFHOOK:
                phoneState += "CALL_STATE_OFFHOOK\n";
            }
            TextView textView = (TextView) findViewById(R.id.textView);
            textView.append(phoneState);
        }
    };

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

        final TelephonyManager telephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
        telephonyManager.listen(mPhoneStateListener, PhoneStateListener.LISTEN_CALL_STATE);
    }

    private boolean checkCallPermission() {
        String permission = "android.permission.CALL_PHONE";
        int res = checkCallingOrSelfPermission(permission);
        return (res == PackageManager.PERMISSION_GRANTED);
    }

    public void dialPhone(View view) {
        if (checkCallPermission()) {
            Intent intent = new Intent(Intent.ACTION_CALL);
            intent.setData(Uri.parse("tel:0123456789"));
            startActivity(intent);
        }
    }

}