监听手机状态改变 - Android

Question

我目前正在尝试创建一个简单的应用程序，记录您通话的分钟数，并在接近免费通话时间时发出警告。

此时，我已经创建了一个名为CallService.java的服务，该服务在用户拨打电话时被调用。此服务仅记录通话的开始时间和结束时间。使用一个名为OutgoingCallReciever.Java的类启动该服务，该类等待用户拨打电话然后启动CallService。

现在，我正在尝试在用户手机未通话时停止CallService。即(电话状态为空闲、摘机或有人呼叫用户)，但我不知道如何做到这一点(我是Java/Android的新手)。我是否可以使用PhoneStateListener 的 onCallStateChanged 方法？(我不确定如何使用它...)

希望您能提供帮助！

以下是相关的类：

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();
        }


}

- fouadalnoor

Answer 1

是的，您需要使用 onCallStateChanged 方法。

将这些行放入您的 onCreate（）方法中，它将初始化 TelephonyManager 对象并为您设置侦听器。

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

内部类ListenToPhoneState的类定义如下：

    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;
            }
        }

    }

解释： 在通话期间，您的听众将经历以下状态，

步骤1：TelephonyManager.CALL_STATE_IDLE

最初，您的呼叫状态将保持空闲，因此变量callEnded将具有值false。

步骤2：TelephonyManager.CALL_STATE_RINGING

现在，您正在等待接收人接听您的电话。

步骤3：TelephonyManager.CALL_STATE_OFFHOOK

您挂断了电话。

步骤4：TelephonyManager.CALL_STATE_IDLE

再次空闲。

注意：如果您不想知道通话何时结束以及结束通话后应执行什么操作，则只需删除callEnded变量，并在进入TelephonyManager.CALL_STATE_IDLE块时停止服务。

希望这对您有所帮助！

- Mehul Joisar