Android监听屏幕开关及解锁

定义一个ScreenListener监听类：

<span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">public</span></span> <span style="color: rgb(0, 0, 255);"><span class="class" style="color: rgb(68, 85, 136); font-weight: bold;"><span class="keyword" style="color: rgb(51, 51, 51);">class</span></span></span><span class="class" style="color: rgb(68, 85, 136); font-weight: bold;"><span style="color: rgb(0, 0, 0);"> <span class="title" style="color: rgb(68, 85, 136);">ScreenListener</span> {</span></span><span style="color: rgb(0, 0, 0);">    </span><span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">private</span></span><span style="color: rgb(0, 0, 0);"> Context mContext;    </span><span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">private</span></span><span style="color: rgb(0, 0, 0);"> ScreenBroadcastReceiver mScreenReceiver;    </span><span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">private</span></span><span style="color: rgb(0, 0, 0);"> ScreenStateListener mScreenStateListener;    </span><span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">public</span></span><span style="color: rgb(0, 0, 0);"> ScreenListener(Context context) {        mContext </span>=<span style="color: rgb(0, 0, 0);"> context;        mScreenReceiver </span>= <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">new</span></span><span style="color: rgb(0, 0, 0);"> ScreenBroadcastReceiver();    }    </span><span style="color: rgb(0, 128, 0);"><span class="javadoc" style="color: rgb(153, 153, 136); font-style: italic;">/**</span></span><span class="javadoc" style="color: rgb(153, 153, 136); font-style: italic;"><span style="color: rgb(0, 128, 0);">     * screen状态广播接收者     </span><span style="color: rgb(0, 128, 0);">*/</span></span><span style="color: rgb(0, 128, 0);"></span>    <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">private</span></span> <span style="color: rgb(0, 0, 255);"><span class="class" style="color: rgb(68, 85, 136); font-weight: bold;"><span class="keyword" style="color: rgb(51, 51, 51);">class</span></span></span><span class="class" style="color: rgb(68, 85, 136); font-weight: bold;"> <span class="title">ScreenBroadcastReceiver</span> <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51);">extends</span></span><span style="color: rgb(0, 0, 0);"> <span class="title" style="color: rgb(68, 85, 136);">BroadcastReceiver</span> {</span></span><span style="color: rgb(0, 0, 0);">        </span><span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">private</span></span> String action = <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">null</span></span><span style="color: rgb(0, 0, 0);">;        <span class="annotation">@Override</span>        </span><span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">public</span></span> <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">void</span></span><span style="color: rgb(0, 0, 0);"> onReceive(Context context, Intent intent) {            action </span>=<span style="color: rgb(0, 0, 0);"> intent.getAction();            </span><span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">if</span></span> (Intent.ACTION_SCREEN_ON.equals(action)) { <span style="color: rgb(0, 128, 0);"><span class="comment" style="color: rgb(153, 153, 136); font-style: italic;">//</span></span><span class="comment" style="color: rgb(153, 153, 136); font-style: italic;"><span style="color: rgb(0, 128, 0);"> 开屏</span></span><span style="color: rgb(0, 128, 0);"></span><span style="color: rgb(0, 0, 0);">                mScreenStateListener.onScreenOn();            } </span><span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">else</span></span> <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">if</span></span> (Intent.ACTION_SCREEN_OFF.equals(action)) { <span style="color: rgb(0, 128, 0);"><span class="comment" style="color: rgb(153, 153, 136); font-style: italic;">//</span></span><span class="comment" style="color: rgb(153, 153, 136); font-style: italic;"><span style="color: rgb(0, 128, 0);"> 锁屏</span></span><span style="color: rgb(0, 128, 0);"></span><span style="color: rgb(0, 0, 0);">                mScreenStateListener.onScreenOff();            } </span><span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">else</span></span> <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">if</span></span> (Intent.ACTION_USER_PRESENT.equals(action)) { <span style="color: rgb(0, 128, 0);"><span class="comment" style="color: rgb(153, 153, 136); font-style: italic;">//</span></span><span class="comment" style="color: rgb(153, 153, 136); font-style: italic;"><span style="color: rgb(0, 128, 0);"> 解锁</span></span><span style="color: rgb(0, 128, 0);"></span><span style="color: rgb(0, 0, 0);">                mScreenStateListener.onUserPresent();            }        }    }    </span><span style="color: rgb(0, 128, 0);"><span class="javadoc" style="color: rgb(153, 153, 136); font-style: italic;">/**</span></span><span class="javadoc" style="color: rgb(153, 153, 136); font-style: italic;"><span style="color: rgb(0, 128, 0);">     * 开始监听screen状态     *      * </span><span style="color: rgb(128, 128, 128);"><span class="javadoctag">@param</span></span><span style="color: rgb(0, 128, 0);"> listener     </span><span style="color: rgb(0, 128, 0);">*/</span></span><span style="color: rgb(0, 128, 0);"></span>    <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">public</span></span> <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">void</span></span><span style="color: rgb(0, 0, 0);"> begin(ScreenStateListener listener) {        mScreenStateListener </span>=<span style="color: rgb(0, 0, 0);"> listener;        registerListener();        getScreenState();    }    </span><span style="color: rgb(0, 128, 0);"><span class="javadoc" style="color: rgb(153, 153, 136); font-style: italic;">/**</span></span><span class="javadoc" style="color: rgb(153, 153, 136); font-style: italic;"><span style="color: rgb(0, 128, 0);">     * 获取screen状态     </span><span style="color: rgb(0, 128, 0);">*/</span></span><span style="color: rgb(0, 128, 0);"></span>    <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">private</span></span> <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">void</span></span><span style="color: rgb(0, 0, 0);"> getScreenState() {        PowerManager manager </span>=<span style="color: rgb(0, 0, 0);"> (PowerManager) mContext                .getSystemService(Context.POWER_SERVICE);        </span><span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">if</span></span><span style="color: rgb(0, 0, 0);"> (manager.isScreenOn()) {            </span><span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">if</span></span> (mScreenStateListener != <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">null</span></span><span style="color: rgb(0, 0, 0);">) {                mScreenStateListener.onScreenOn();            }        } </span><span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">else</span></span><span style="color: rgb(0, 0, 0);"> {            </span><span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">if</span></span> (mScreenStateListener != <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">null</span></span><span style="color: rgb(0, 0, 0);">) {                mScreenStateListener.onScreenOff();            }        }    }    </span><span style="color: rgb(0, 128, 0);"><span class="javadoc" style="color: rgb(153, 153, 136); font-style: italic;">/**</span></span><span class="javadoc" style="color: rgb(153, 153, 136); font-style: italic;"><span style="color: rgb(0, 128, 0);">     * 停止screen状态监听     </span><span style="color: rgb(0, 128, 0);">*/</span></span><span style="color: rgb(0, 128, 0);"></span>    <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">public</span></span> <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">void</span></span><span style="color: rgb(0, 0, 0);"> unregisterListener() {        mContext.unregisterReceiver(mScreenReceiver);    }    </span><span style="color: rgb(0, 128, 0);"><span class="javadoc" style="color: rgb(153, 153, 136); font-style: italic;">/**</span></span><span class="javadoc" style="color: rgb(153, 153, 136); font-style: italic;"><span style="color: rgb(0, 128, 0);">     * 启动screen状态广播接收器     </span><span style="color: rgb(0, 128, 0);">*/</span></span><span style="color: rgb(0, 128, 0);"></span>    <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">private</span></span> <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">void</span></span><span style="color: rgb(0, 0, 0);"> registerListener() {        IntentFilter filter </span>= <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">new</span></span><span style="color: rgb(0, 0, 0);"> IntentFilter();        filter.addAction(Intent.ACTION_SCREEN_ON);        filter.addAction(Intent.ACTION_SCREEN_OFF);        filter.addAction(Intent.ACTION_USER_PRESENT);        mContext.registerReceiver(mScreenReceiver, filter);    }    </span><span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">public</span></span> <span style="color: rgb(0, 0, 255);"><span class="class" style="color: rgb(68, 85, 136); font-weight: bold;"><span class="keyword" style="color: rgb(51, 51, 51);">interface</span></span></span><span class="class" style="color: rgb(68, 85, 136); font-weight: bold;"> <span class="title">ScreenStateListener</span> {</span><span style="color: rgb(0, 128, 0);"><span class="comment" style="color: rgb(153, 153, 136); font-style: italic;">//</span></span><span class="comment" style="color: rgb(153, 153, 136); font-style: italic;"><span style="color: rgb(0, 128, 0);"> 返回给调用者屏幕状态信息</span></span><span style="color: rgb(0, 128, 0);"></span>        <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">public</span></span> <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">void</span></span><span style="color: rgb(0, 0, 0);"> onScreenOn();        </span><span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">public</span></span> <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">void</span></span><span style="color: rgb(0, 0, 0);"> onScreenOff();        </span><span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">public</span></span> <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">void</span></span><span style="color: rgb(0, 0, 0);"> onUserPresent();    }}</span>

在上面的代码中,用到了动态注册广播,在需要监听屏幕状态的activity中,当不需要监听的时候,如activity finish的时候,使用unregisterListener解除广播监听; 
下面是在Activity中调用;

ScreenListener l = <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">new</span></span> ScreenListener(<span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">this</span></span><span style="color: rgb(0, 0, 0);">);        l.begin(</span><span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">new</span></span><span style="color: rgb(0, 0, 0);"> ScreenStateListener() {            <span class="annotation">@Override</span>            </span><span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">public</span></span> <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">void</span></span><span style="color: rgb(0, 0, 0);"> onUserPresent() {                Log.e(</span><span class="string" style="color: rgb(221, 17, 68);">"onUserPresent"</span>, <span class="string" style="color: rgb(221, 17, 68);">"onUserPresent"</span><span style="color: rgb(0, 0, 0);">);            }            <span class="annotation">@Override</span>            </span><span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">public</span></span> <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">void</span></span><span style="color: rgb(0, 0, 0);"> onScreenOn() {                Log.e(</span><span class="string" style="color: rgb(221, 17, 68);">"onScreenOn"</span>, <span class="string" style="color: rgb(221, 17, 68);">"onScreenOn"</span><span style="color: rgb(0, 0, 0);">);            }            <span class="annotation">@Override</span>            </span><span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">public</span></span> <span style="color: rgb(0, 0, 255);"><span class="keyword" style="color: rgb(51, 51, 51); font-weight: bold;">void</span></span><span style="color: rgb(0, 0, 0);"> onScreenOff() {                Log.e(</span><span class="string" style="color: rgb(221, 17, 68);">"onScreenOff"</span>, <span class="string" style="color: rgb(221, 17, 68);">"onScreenOff"</span><span style="color: rgb(0, 0, 0);">);            }        });</span>

通过以上步骤即实现了对屏幕状态的监听.