Question

我目前正在尝试创建一个简单的应用程序，记录您拨打电话的时间，然后在接近您的免费分钟时警告您。

此时我创建了一个名为CallService.java的服务，只要用户调用人员就会调用该服务。该服务仅记录呼叫的开始时间和呼叫的结束时间。该服务使用名为OutgoingCallReciever.Java的类启动。该类只是等待用户呼叫某人然后启动CallService。

我正在尝试在用户电话没有呼叫某人时停止CallService。即（手机状态闲置，摘机或其他人正在呼叫用户）但我不知道该怎么做（我是Java / Android的新手）。我是否使用PhoneStateListener的onCallStateChanged方法？（我不确定如何使用它。）

希望你能帮忙！

课程如下：

MainActivity.java

package com.fouadalnoor.callcounter;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.Toast;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.telephony.TelephonyManager;
import android.telephony.PhoneStateListener;

public class MainActivity extends Activity {

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

        TelephonyManager tm = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);
        PhoneStateListener ps =(PhoneStateListener) getSystemService(TELEPHONY_SERVICE);

         Toast.makeText(this, "Phone State = " + tm.getCallState() , Toast.LENGTH_LONG).show();


        CheckBox checkBox = (CheckBox) findViewById(R.id.checkBox1);
        checkBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {

                @Override
                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

                    if(isChecked){
                        stopService (new Intent(buttonView.getContext(),CallService.class));
                    }
                }
            });

    }

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

}

OutgoingCallReciever.java

package com.fouadalnoor.callcounter;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;


public class OutgoingCallReciever extends BroadcastReceiver {


     @Override
        public void onReceive(Context context, Intent intent) {
          context.startService(new Intent(context, CallService.class));
     }

}

CallService.java

package com.fouadalnoor.callcounter;

import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.IBinder;
import android.widget.Toast;
import java.lang.String;


public class CallService extends Service {

    public long startTime,endTime, totalTime;

    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return null;
    }

        @Override
        public void onDestroy() {

            Toast.makeText(this, "Call Service stopped", Toast.LENGTH_LONG).show(); 

            endTime = System.currentTimeMillis()/1000;
            Toast.makeText(this, "endTime = " + endTime, Toast.LENGTH_LONG).show();
            totalTime =  endTime-startTime; 
            Toast.makeText(this, "totalTime = " + totalTime , Toast.LENGTH_LONG).show();

        }

        @Override
        public void onStart(Intent intent, int startid) {
            Toast.makeText(this, "Call Service started by user.", Toast.LENGTH_LONG).show();

            startTime = System.currentTimeMillis()/1000;
            Toast.makeText(this, "startTime = "+ startTime, Toast.LENGTH_LONG).show();
        }


}

Answer 1

是的，您需要使用onCallStateChanged方法。

将这一行放在onCreate()方法中，它会初始化TelephonyManager的对象并为您设置监听器。

TelephonyManager tManager = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
ListenToPhoneState listener = new ListenToPhoneState()
tManager.listen(listener, PhoneStateListener.LISTEN_CALL_STATE);

内部类ListenToPhoneState的类定义将如下所示，

    private class ListenToPhoneState extends PhoneStateListener {

        boolean callEnded=false;
        public void onCallStateChanged(int state, String incomingNumber) {

            switch (state) {
            case TelephonyManager.CALL_STATE_IDLE:
                UTILS.Log_e("State changed: " , state+"Idle");


                if(callEnded)
                {
                    //you will be here at **STEP 4**
                    //you should stop service again over here
                }
                  else
                  {
                    //you will be here at **STEP 1**
                 //stop your service over here,
                    //i.e. stopService (new Intent(`your_context`,`CallService.class`));
                    //NOTE: `your_context` with appropriate context and `CallService.class` with appropriate class name of your service which you want to stop.

                  }


                break;
            case TelephonyManager.CALL_STATE_OFFHOOK:
                UTILS.Log_e("State changed: " , state+"Offhook");
                    //you will be here at **STEP 3**
                 // you will be here when you cut call
                callEnded=true;
                break;
            case TelephonyManager.CALL_STATE_RINGING:
                UTILS.Log_e("State changed: " , state+"Ringing");
                    //you will be here at **STEP 2**

                break;


            default:
                break;
            }
        }

    }

<强>阐释：在通话时，您的听众将经历以下状态，

第1步：TelephonyManager.CALL_STATE_IDLE

最初您的通话状态将处于空闲状态，这就是变量callEnded将具有值false的原因。

第2步：TelephonyManager.CALL_STATE_RINGING

现在您正在等待接收者接听您的电话

第3步：TelephonyManager.CALL_STATE_OFFHOOK

你切断了电话

第4步：TelephonyManager.CALL_STATE_IDLE

再次闲置

注意：如果您不想知道通话何时结束以及结束通话后应该做什么，那么只需删除callEnded变量并在您输入时停止服务TelephonyManager.CALL_STATE_IDLE

的块

我希望它会有所帮助!!

听取手机状态的变化 - Android

1 个答案: