【Android】实战开发之锁屏Activity实现步骤清晰简述
Android实战开发中，锁屏App占市场已不是小数，技术上其实也已经广为流传，首先需要知道锁屏实际上只是一个Activity而已，而开发一款锁屏App大致步骤都差不多，拢共就那么几步，为更清晰的了解以下以从文件分类角度进行说明：
一、首先，清单文件AndroidManifest.xml
1、添加权限：
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.DISABLE_KEYGUARD" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.RESTART_PACKAGES" />2、activity：
<activity
android:name="com.example.LockActivity"
android:launchMode="singleTask"
android:excludeFromRecents="true" >
<intent-filter>
<category android:name="android.intent.category.HOME" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>3、service：
<service android:name="com.example.LockService" >4、receiver：
<receiver android:name="com.unluck.receiver.BootReceiver">
<intent-filter android:priority="1000" >
<action android:name="android.intent.action.BOOT_COMPLETED"/>
<category android:name="android.intent.category.HOME" />
<category android:name="android.intent.category.LAUNCHER" />
<category android:name="android.intent.category.DEFAULT" />
<action android:name="android.intent.action.DATE_CHANGED" />
<action android:name="RestartSerivcesForSystemEventReceiver" />
<action android:name="android.intent.action.MEDIA_MOUNTED" />
<action android:name="android.intent.action.MEDIA_UNMOUNTED" />
<action android:name="android.intent.action.MEDIA_EJECT" />
<data android:scheme="file" />
</intent-filter>
</receiver>二、开机广告接收器BootReceiver
public class BootReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
context.startService(new Intent(context,LockService.class));//此Service可在首次启动Activity中启动
}
}三、后台运行的锁屏服务LockService
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
import com.tongleer.view.LockActivity;
/**
* 锁屏Service，用于监听屏幕变亮或变暗事件
* @author tongleer.com
*
*/
public class LockService extends Service{
private ScreenOnReceiver screenOnReceiver;
private ScreenOffReceiver screenOffReceiver;
@Override
public void onCreate() {
super.onCreate();
screenOnReceiver=new ScreenOnReceiver();
IntentFilter screenOnFilter=new IntentFilter();
screenOnFilter.addAction("android.intent.action.SCREEN_ON");
registerReceiver(screenOnReceiver, screenOnFilter);
screenOffReceiver=new ScreenOffReceiver();
IntentFilter screenOffFilter=new IntentFilter();
screenOffFilter.addAction("android.intent.action.SCREEN_OFF");
registerReceiver(screenOffReceiver, screenOffFilter);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
return Service.START_STICKY;
}
/**
* 监听屏幕变亮的广播接收器，变亮就屏蔽系统锁屏
* @author tongleer.com
*
*/
private class ScreenOnReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
String action=intent.getAction();
if(action.equals("android.intent.action.SCREEN_ON")){
/*
* 此方式已经过时，在activtiy中编写
* getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
* getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);
* 两句可以代替此方式
*/
/*KeyguardManager keyguardManager = (KeyguardManager)context.getSystemService(Context.KEYGUARD_SERVICE);
KeyguardLock lock = keyguardManager.newKeyguardLock("");
lock.disableKeyguard();*/
}
}
}
/**
* 监听屏幕变暗的广播接收器，变暗就启动应用锁屏界面activity
* @author tongleer.com
*
*/
private class ScreenOffReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
String action=intent.getAction();
if(action.equals("android.intent.action.SCREEN_OFF")){
Intent i1=new Intent(context,LockActivity.class);
i1.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(i1);
}
}
}
@Override
public void onDestroy() {
super.onDestroy();
unregisterReceiver(screenOnReceiver);
unregisterReceiver(screenOffReceiver);
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
}四、锁屏界面LockActivity
1、在onCreate中执行以下代码：
getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);2、重写onKeyDown方法并返回false使锁屏界面禁用回退键：
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
return false;
}（1）锁屏工具类
import android.content.Context;
import android.graphics.PixelFormat;
import android.view.View;
import android.view.WindowManager;
import android.view.WindowManager.LayoutParams;
/**
* 锁屏工具类
* @author tongleer.com
*
*/
public class LockUtil {
private Context mContext;
private WindowManager mWindowManager;// 窗口管理器
private View mLockView;// 锁屏视图
private WindowManager.LayoutParams wmParams;
private static LockUtil mLockUtil;
private boolean isLocked;// 是否锁定
public static synchronized LockUtil getInstance(Context mContext) {
if (mLockUtil == null) {
mLockUtil = new LockUtil(mContext);
}
return mLockUtil;
}
/**
* 构造方法
* @param mContext
*/
public LockUtil(Context mContext) {
this.mContext = mContext;
init();
}
/**
* 初始化布局
*/
private void init() {
isLocked = false;
// 获取WindowManager
mWindowManager = (WindowManager) mContext.getApplicationContext().getSystemService("window");
// 设置LayoutParams(全局变量）相关参数
wmParams = new WindowManager.LayoutParams();
wmParams.type = LayoutParams.TYPE_SYSTEM_ERROR;// 关键部分
wmParams.format = PixelFormat.RGBA_8888; // 设置图片格式，效果为背景透明
// 设置Window flag
wmParams.width = WindowManager.LayoutParams.FILL_PARENT;
wmParams.height = WindowManager.LayoutParams.FILL_PARENT;
wmParams.flags = 1280;
}
/**
* 锁屏
*/
public synchronized void lock() {
if (mLockView != null && !isLocked) {
mWindowManager.addView(mLockView, wmParams);
}
isLocked = true;
}
/**
* 解锁
*/
public synchronized void unlock() {
if (mWindowManager != null && isLocked) {
mWindowManager.removeView(mLockView);
}
isLocked = false;
}
/**
* 更新
*/
public synchronized void update() {
if (mLockView != null && !isLocked) {
mWindowManager.updateViewLayout(mLockView, wmParams);
}
}
/**
* 设置锁屏视图
* @param v
*/
public synchronized void setLockView(View v) {
mLockView = v;
}
}（2）在锁屏界面activity中创建对象并开启锁屏
private LockUtil lockLayer;
private View lockView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
lockView = View.inflate(this, R.layout.main, null);
lockLayer = new LockUtil(this);
lockLayer.setLockView(lockView);// 设置要展示的页面
lockLayer.lock();// 开启锁屏
CustomView.setHandler(mHandler);
}
