简单的说下实现来电秀的大概原理流程：首先通过监听来电状态，通过拦截来电然后在窗口弹出一层系统级别的弹窗，这层弹窗即是来电秀。
先来两张效果图：
下面来说下实现，因为商用的原因，不能直接贴代码，所以在这里，会贴一些比较核心的代码，大概分为五个步骤：
/**
* 电话状态监听（来电或去电）
*
* @author Jenly
*
*/
public class PhoneStateReceiver extends BroadcastReceiver {
public static final String PHONE_STATE = "android.intent.action.PHONE_STATE";
@Override
public void onReceive(Context context, Intent intent) {
LogUtils.d(intent.getAction());
context.startService(new Intent(context,CallShowService.class));
}
}这是一个广播接收器，用来接收手机来电状态的，把接收到的状态发送给CallShowService服务来做相应的处理
CallShowService.class是一个来电秀服务（CallShowService extends Service），里面的主要核心代码是通过监听来电状态来做出相应的处理，如：弹屏
下面是CallShowService几个比较核心的代码：
@Override
public void onCreate() {
super.onCreate();
isRunning = true;
initPhoneStateListener();
callShowView = CallShowView.getInstance();
}/**
* 初始化电话状态监听
*/
private void initPhoneStateListener(){
phoneStateListener = new PhoneStateListener(){
@Override
public void onCallStateChanged(int state, String incomingNumber) {
super.onCallStateChanged(state, incomingNumber);
phoneState = state;
if(isEnable){//启用
switch (state) {
case TelephonyManager.CALL_STATE_IDLE://待机时（即无电话时,挂断时会调用）
LogUtils.d("CALL_STATE_IDLE");
dismiss();//关闭来电秀
break;
case TelephonyManager.CALL_STATE_OFFHOOK://摘机（接听）
LogUtils.d("CALL_STATE_OFFHOOK");
callShow();//显示来电秀
break;
case TelephonyManager.CALL_STATE_RINGING://响铃(来电)
LogUtils.d("CALL_STATE_RINGING");
isCalling = false;
phoneNumber = incomingNumber;
LogUtils.d("incomingNumber:"+ incomingNumber);//来电号码
callShow();//显示来电秀
break;
default:
break;
}
}
}
};
//--------------------------
telephonyManager = (TelephonyManager)getSystemService(TELEPHONY_SERVICE);
//设置监听器
telephonyManager.listen(phoneStateListener, PhoneStateListener.LISTEN_CALL_STATE);
}@Override
public int onStartCommand(Intent intent, int flags, int startId) {
if(intent!=null && Intent.ACTION_NEW_OUTGOING_CALL.equals(intent.getAction())){//去电
phoneNumber = intent.getStringExtra(Intent.EXTRA_PHONE_NUMBER);
LogUtils.d("Calling..."+phoneNumber);
isCalling = true;
}
return super.onStartCommand(intent, START_STICKY, startId);
}CallShowView 来电秀界面 （CallShowView extends View），里面弹屏的核心代码:
private void initViews() {
context = getContext();
windowManager = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
int width = windowManager.getDefaultDisplay().getWidth();
int height = windowManager.getDefaultDisplay().getHeight();
// -------------
params = new LayoutParams();
params.gravity = Gravity.LEFT | Gravity.TOP;
params.x = 0;
params.y = 0;
params.width = width;
params.height = height;
params.screenOrientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
// 设置图片格式，效果为背景透明
params.format = PixelFormat.TRANSLUCENT;
// 设置Window flag 系统级弹框 | 覆盖表层
params.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;
// 不可聚集（不让返回键） | 全屏 | 透明标状态栏
params.flags = LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_FULLSCREEN
| WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS
| WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION
| WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN ;
initCalledView();
}/**
* 自动启动
* @author Jenly
*/
public class AutoStartReceiver extends BroadcastReceiver {
public static final String AUTO_START_RECEIVER = "jenly.autostart_action";
@Override
public void onReceive(Context context, Intent intent) {
LogUtils.d("AutoStartReceiver");
if(!CallShowService.isRunning)
startCallShowService(context, intent);
}
private void startCallShowService(Context context, Intent intent) {
intent.setClass(context, CallShowService.class);
context.startService(intent);
}
}在CallShowService的生命周期里面需要加上一句核心的代码，保证CallShowService不被进程杀死，如下：
@Override
public void onDestroy() {
isRunning = false;
sendBroadcast(new Intent(AutoStartReceiver.AUTO_START_RECEIVER));
super.onDestroy();
}<!-- 电话状态接收广播 -->
<receiver android:name=".service.PhoneStateReceiver" >
<intent-filter>
<action android:name="android.intent.action.PHONE_STATE" />
<action android:name="android.intent.action.NEW_OUTGOING_CALL" />
</intent-filter>
</receiver>
<receiver android:name=".service.AutoStartReceiver" >
<intent-filter android:priority="1000">
<action android:name="android.intent.action.RECEIVE_BOOT_COMPLETED" />
<action android:name="android.intent.action.USER_PRESENT" />
<action android:name="jenly.autostart_action" />
</intent-filter>
</receiver>
<service android:name=".service.CallShowService"
android:enabled="true" >
<intent-filter android:priority="1000" >
<action android:name=".service.CallShowService" />
</intent-filter>
</service><uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.RECEIVE_USER_PRESENT" />
<uses-permission android:name="android.permission.CALL_PHONE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<!-- 弹出窗口权限 -->
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />这样来电秀算是基本实现了，简单的总结一下几个重要的点：
1、手机来电状态的监听拦截、
2、来去电弹屏、
3、开机启动保证弹屏服务不被后台杀死、
今天就先到这里了，后续会把来电秀界面的电话的接听与挂机也写出来，更多关于Android来电秀的资料请关注其它相关文章！
