安卓开发：电话录音器模拟代码

录音功能和一些细节功能添加在这个框架上即可：

一个简单的布局，放一个按钮：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >



    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="57dp"
        android:text="点击开始录音"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <Button
        android:onClick="click"
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="28dp"
        android:text="开始录音" />

</RelativeLayout>

MainActivity:

package org.dreamtech.phonelisterner;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;

public class MainActivity extends Activity {

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

    public void click(View v) {
        Intent intent = new Intent(this, PhoneService.class);
        startService(intent);
    }
}

Service:

package org.dreamtech.phonelisterner;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;

public class PhoneService extends Service {

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        TelephonyManager tm = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);
        tm.listen(new MyPhoneStateListener(),
                PhoneStateListener.LISTEN_CALL_STATE);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
    }

    private class MyPhoneStateListener extends PhoneStateListener {
        @Override
        public void onCallStateChanged(int state, String incomingNumber) {
            super.onCallStateChanged(state, incomingNumber);
            switch (state) {
            case TelephonyManager.CALL_STATE_IDLE:

                break;
            case TelephonyManager.CALL_STATE_OFFHOOK:
                // 开始 录音
                break;
            case TelephonyManager.CALL_STATE_RINGING:
                // 准备录音器
                break;
            }
        }
    }
}

记得配置服务和权限（READ_CALL）