前言，小米手机中，有一个防误触模式，最近领导让我做一下，顺便学习一下Keyguard的流程。 欢迎加Q1875190039
本文内容：
1.口袋模式的实现原理
2.代码实现
3.注意事项
4.开机闹钟
5.图案锁
一 .口袋模式实现原理
1. 使用距离感应器，感应遮挡情况
2. 使用SystemProperties 作为开关值
3.在KeyguardHost 上，加一层FrameLayout 作为遮挡，并且阻止手势事件向下传递
4.阻止Statusbar 与开启statusbar
二.类间关系与说明
见博客《锁屏机制及原理》
三.实现方法
本文重点章节Andrid 4.4 之后锁屏由jar包变为apk ,并且其路径也变为frameworks\base\packages\Keyguard
KeyguardHostView 是真正处理锁屏机制的View，如pin .图案，滑动 等等，所以我们可以在这里添加代码，来出来锁屏之前的事件。作为 keyguard 防误触的实现。代码如下：
private Sensor mPocketSensor = null;
private SensorManager mPocketSensorManager = null;
private void initSensorManager() {
try {
if (mContext != null) {
mPocketSensorManager = (SensorManager) mContext
.getSystemService(Context.SENSOR_SERVICE);
if (mPocketSensorManager != null && !PowerOffAlarmManager.isAlarmBoot()) {
// 避免开机闹钟，以及alarm mode 的时候。出现crush
mPocketSensor = mPocketSensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY);
}
}
} catch (Exception e) {
}
}
private void registerProximityListener() {
if (mPocketSensor != null && mPocketSensorManager != null) {
mPocketSensorManager.registerListener(proximityEventListener,
mPocketSensor,
SensorManager.SENSOR_DELAY_GAME);
}
}
private void unregisterProximityListener() {
if (mPocketSensor != null && mPocketSensorManager != null) {
mPocketSensorManager.unregisterListener(proximityEventListener);
}
}
private final static float DISTANCE_NEAR = 0.0f;
private final static float DISTANCE_FAR = 1.0f;
/**
* define the poket mode broadcast
*/
private static final String NOTIFY_POCKET = "com.morncloud.keyguard.pocket";
private FrameLayout mMistakenTouchFrameLayout = null;
private SensorEventListener proximityEventListener = new SensorEventListener() {
@Override
public void onSensorChanged(SensorEvent event) {
Log.d(TAG, "ProximityEventListener");
Float distance = event.values[0];
Log.i(TAG, "onSensorChanged() distance = " + distance);
boolean isPocketModeOn = isPocketModeOn();
Log.i(TAG, "onSensorChanged() isPocketModeOn = " + isPocketModeOn);
if (distance == (DISTANCE_NEAR) && isPocketModeOn) {
Log.i(TAG, "poket is near ");
showPocktMode(true);
} else {
Log.i(TAG, "poket is far ");
showPocktMode(false);
enableNotification();
}
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// TODO Auto-generated method stub
}
};
/**
* the Kikat can't call the collapsePanels() to disbable the notification
* but the method of disable can do the job
*/
private void collapseNotification() {
try {
StatusBarManager service = (StatusBarManager) mContext.getSystemService("statusbar");
if (service != null) {
Log.i(TAG, "StatusBarManager ");
// service.collapsePanels();
// int flags = 0x1090000;
// flags |= AntiTheftManager.getHideStatusBarIconFlags();
// service.disable(flags);
// Log.i(TAG, "StatusBarManager ");
int flags = StatusBarManager.DISABLE_NONE;
flags |= StatusBarManager.DISABLE_RECENT;
flags |= StatusBarManager.DISABLE_EXPAND;
flags |= StatusBarManager.DISABLE_NOTIFICATION_TICKER;
Log.d(TAG,Integer.toHexString(flags)+"flags ox");
flags |= AntiTheftManager.getHideStatusBarIconFlags();
service.disable(flags);
}
} catch (Exception e) {
}
}
private void enableNotification() {
try {
// StatusBarManager service = (StatusBarManager)
// mContext.getSystemService("statusbar");
// if (service != null) {
// Log.i(TAG, "StatusBarManager ");
// // service.collapsePanels();
// int flags = StatusBarManager.DISABLE_NONE;
// flags |= AntiTheftManager.getHideStatusBarIconFlags() ;
// service.disable(flags);
// // Log.i(TAG, "StatusBarManager ");
// }
mContext.sendBroadcast(new Intent("com.keyguard.pocket"), null);
} catch (Exception e) {
}
}
private boolean isPocketModeOn() {
Log.e(TAG, "isPocketModeOn is calling");
Log.e(TAG, "isPocketModeOn" + SystemProperties.getInt(POCKET_MODE_ON_FLAG, 0));
return SystemProperties.getInt(POCKET_MODE_ON_FLAG, 0) == 1;
}
private void showPocktMode(boolean show) {
Log.e(TAG, "pockt mode is on" + isPocketModeOn());
if (show) {
mMistakenTouchFrameLayout.setVisibility(View.VISIBLE);
collapseNotification();
} else {
mMistakenTouchFrameLayout.setVisibility(View.GONE);
}
}
同时，我们应该在KeyguardViewMediator 加一个处理机制，因为，这样做会无法解开statusbar 。所以在KeyguardViewMediator 添加如下代码：
private static final String NOTIFY_POCKET = "com.keyguard.pocket";
private BroadcastReceiver mNotificationReceiver = new BroadcastReceiver() {
@Override
public void onReceive(final Context context, final Intent intent) {
if (intent != null && intent.getAction().equals(NOTIFY_POCKET)) {
adjustStatusBarLocked();
}
}
};
四，注意事项
口袋模式的实现还是存在许多坑的，比如，拦截开关机闹钟。Statusbar 问题。还有Systemproperties 中值的问题。文末，如果各位大神有疑问，欢迎留言，拍砖，大家一起进步。