免费一级网站,亚洲成人免费视频,久久精品亚洲国产

本文實(shí)例講述了Android中懸浮窗口的實(shí)現(xiàn)原理。分享給大家供大家參考。具體如下：

用了我一個(gè)周末的時(shí)間，個(gè)中憤懣就不說(shuō)了，就這個(gè)問(wèn)題，我翻遍全球網(wǎng)絡(luò)沒(méi)有一篇像樣的資料，現(xiàn)在將實(shí)現(xiàn)原理簡(jiǎn)單敘述如下：

調(diào)用WindowManager，并設(shè)置WindowManager.LayoutParams的相關(guān)屬性，通過(guò)WindowManager的addView方法創(chuàng)建View，這樣產(chǎn)生出來(lái)的View根據(jù)WindowManager.LayoutParams屬性不同，效果也就不同了。比如創(chuàng)建系統(tǒng)頂級(jí)窗口，實(shí)現(xiàn)懸浮窗口效果！

WindowManager的方法很簡(jiǎn)單，基本用到的就三個(gè)addView，removeView，updateViewLayout。

而WindowManager.LayoutParams的屬性就多了，非常豐富，具體請(qǐng)查看SDK文檔。這里給出Android中的WindowManager.java源碼，可以具體看一下。
下面是簡(jiǎn)單示例代碼：

									public class myFloatView extends Activity {

									/** Called when the activity is first created. */

									@Override public void onCreate(Bundle savedInstanceState) { 

									super.onCreate(savedInstanceState);

									setContentView(R.layout.main);

									Button bb=new Button(getApplicationContext());

									WindowManager wm=(WindowManager)getApplicationContext().getSystemService("window");

									WindowManager.LayoutParams wmParams = new WindowManager.LayoutParams(); 

									/** *以下都是WindowManager.LayoutParams的相關(guān)屬性 * 具體用途請(qǐng)參考SDK文檔 */

									wmParams.type=2002; //這里是關(guān)鍵，你也可以試試2003

									wmParams.format=1; /** *這里的flags也很關(guān)鍵 *代碼實(shí)際是wmParams.flags |= FLAG_NOT_FOCUSABLE; *40的由來(lái)是wmParams的默認(rèn)屬性（32）+ FLAG_NOT_FOCUSABLE（8） */

									wmParams.flags=40;

									wmParams.width=40;

									wmParams.height=40;

									wm.addView(bb, wmParams);//創(chuàng)建View

									}

									}

別忘了在AndroidManifest.xml中添加權(quán)限：

復(fù)制代碼代碼如下:

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

PS:這里舉例說(shuō)明一下type的值的意思：

									/** * Window type: phone. These are non-application windows providing * user interaction with the phone (in particular incoming calls). * These windows are normally placed above all applications, but behind * the status bar. */

									public static final int TYPE_PHONE = FIRST_SYSTEM_WINDOW+2;

									/** * Window type: system window, such as low power alert. These windows * are always on top of application windows. */

									public static final int TYPE_SYSTEM_ALERT = FIRST_SYSTEM_WINDOW+3;