android 检测 Home 键

因为一些特殊程序的要求需要检测 Home 键，activity 类方法：

1	`public` `boolean` `dispatchKeyEvent (KeyEvent event)`

可以重写不同的 keyevent 处理，但是 Home 不会 dispatch 过来，这就让检测 Home 键变得困难了。

PhoneWindowManager主要负责每个 activity 的 ui 刷新和部分事件的处理，其中：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 void launchHomeFromHotKey() { if (mKeyguardMediator.isShowingAndNotHidden()) { // don't launch home if keyguard showing } else if (!mHideLockScreen && mKeyguardMediator.isInputRestricted()) { // when in keyguard restricted mode, must first verify unlock // before launching home mKeyguardMediator.verifyUnlock( new OnKeyguardExitResult() { public void onKeyguardExitResult( boolean success) { if (success) { try { ActivityManagerNative.getDefault().stopAppSwitches(); } catch (RemoteException e) { } sendCloseSystemWindows(SYSTEM_DIALOG_REASON_HOME_KEY); startDockOrHome(); } } }); } else { // no keyguard stuff to worry about, just launch home! try { ActivityManagerNative.getDefault().stopAppSwitches(); } catch (RemoteException e) { } sendCloseSystemWindows(SYSTEM_DIALOG_REASON_HOME_KEY); startDockOrHome(); } }

其中：

1 2	`sendCloseSystemWindows(SYSTEM_DIALOG_REASON_HOME_KEY);` `startDockOrHome();`

发送广播 Intent.ACTION_CLOSE_SYSTEM_DIALOGS，开始 Launch Home，根据这点，我们可以监听广播：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 class InnerRecevier extends BroadcastReceiver { static final String SYSTEM_DIALOG_REASON_KEY = "reason" ; static final String SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS = "globalactions" ; static final String SYSTEM_DIALOG_REASON_RECENT_APPS = "recentapps" ; static final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey" ; @Override public void onReceive(Context context, Intent intent) { String action = intent.getAction(); if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) { //监听广播 String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY); //获取原因 if (reason != null ) { Lg.i( "receive action:" + action + ",reason:" + reason); if (mListener != null ) { if (reason.equals(SYSTEM_DIALOG_REASON_HOME_KEY)) { // 按 Home mListener.onHomePressed(); } else if (reason.equals(SYSTEM_DIALOG_REASON_RECENT_APPS)) { // 长按 Home mListener.onHomeLongPressed(); } } } } } }

以下是完整代码： package com.tiger.watcher;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;

import com.tiger.utils.Lg;

/**
* watch the HOME key pressed, we only listen the HOME pressed <b>NOT Intercept
* </b>this pressed.<br>
* Tips:invoke {@link #startWatch()} in activity's onResume method and
* {@link #stopWatch()} in activity's onStop Method.
*
* @author idiottiger
*/
public class HomeWatcher {

static final String LOG_TAG = "HomeWatcher";

private Context mContext;

private IntentFilter mFilter;

private OnHomePressedListener mListener;

private InnerRecevier mRecevier;

public HomeWatcher(Context context) {
mContext = context;
mFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
}

/**
* set the home pressed listener, if set will callback the home pressed
* listener's method when home pressed.
*
* @param listener
*/
public void setOnHomePressedListener(OnHomePressedListener listener) {
mListener = listener;
mRecevier = new InnerRecevier();
}

/**
* start watch
*/
public void startWatch() {
if (mRecevier != null) {
mContext.registerReceiver(mRecevier, mFilter);
}
}

/**
* stop watch
*/
public void stopWatch() {
if (mRecevier != null) {
mContext.unregisterReceiver(mRecevier);
}
}

class InnerRecevier extends BroadcastReceiver {

static final String SYSTEM_DIALOG_REASON_KEY = "reason";

static final String SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS = "globalactions";

static final String SYSTEM_DIALOG_REASON_RECENT_APPS = "recentapps";

static final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";

@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {
String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY);
if (reason != null) {
Lg.i("receive action:" + action + ",reason:" + reason);
if (mListener != null) {
if (reason.equals(SYSTEM_DIALOG_REASON_HOME_KEY)) {
mListener.onHomePressed();
} else if (reason.equals(SYSTEM_DIALOG_REASON_RECENT_APPS)) {
mListener.onHomeLongPressed();
}
}
}
}
}

}

}

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