Android利用WindowManager生成悬浮按钮及悬浮菜单
简介
本文模仿实现的是360手机卫士基础效果,同时后续会补充一些WindowManager的原理知识。
整体思路
360手机卫士的内存球其实就是一个没有画面的应用程序,整个应用程序的主体是一个Service。我们的程序开始以后,启动一个service,同时关闭activity即可:
public class MainActivity extends Activity { private static final String TAG = MainActivity.class.getSimpleName(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); startService(new Intent(this, FloatWindowService.class)); finish(); } } import android.os.IBinder; import android.util.Log; import java.util.Timer; import java.util.TimerTask; public class FloatWindowService extends Service { private static final String TAG = FloatWindowService.class.getSimpleName(); public FloatWindowService() { } @Override public int onStartCommand(Intent intent, int flags, int startId) { Log.d(TAG, "on start command"); FloatWindowManager.instance(getApplicationContext()).createFloatWindow(); return super.onStartCommand(intent, flags, startId); } @Override public IBinder onBind(Intent intent) { // TODO: Return the communication channel to the service. throw new UnsupportedOperationException("Not yet implemented"); } }
我们要注意的是,传统的Service默认是运行在UI线程中的,这点与封装了一个Thread和Handler的intentService不同,所以我们可以直接在Service中更改UI相关的内容。
再来看一下FloatWindowManager中的方法:
public void createFloatWindow() { if (isWindowShowing()) return; WindowManager windowManager = getWindowManger(context); int screenWidth = windowManager.getDefaultDisplay().getWidth(); int screenHeight = windowManager.getDefaultDisplay().getHeight(); if (floatLayout == null) { floatLayout = new FloatLayout(context); if (smallLayoutParams == null) { smallLayoutParams = new WindowManager.LayoutParams(); smallLayoutParams.type = WindowManager.LayoutParams.TYPE_PHONE; smallLayoutParams.format = PixelFormat.RGBA_8888; smallLayoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE; smallLayoutParams.gravity = Gravity.LEFT | Gravity.TOP; smallLayoutParams.width = FloatLayout.viewWidth; smallLayoutParams.height = FloatLayout.viewHeight; smallLayoutParams.x = screenWidth; smallLayoutParams.y = screenHeight / 2; } } windowManager.addView(floatLayout,smallLayoutParams); }
以及自定义的View:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/small_layout" android:background="@drawable/bg_small" android:orientation="vertical" android:layout_width="60dip" android:layout_height="25dip"> <TextView android:layout_width="match_parent" android:gravity="center" android:text="悬浮窗" android:layout_height="match_parent" /> </LinearLayout>
public class FloatLayout extends LinearLayout { public static int viewWidth; public static int viewHeight; private WindowManager windowManager; public FloatLayout(final Context context) { super(context); windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE); LayoutInflater.from(context).inflate(R.layout.small_layout, this); View view = findViewById(R.id.small_layout); viewWidth = view.getLayoutParams().width; viewHeight = view.getLayoutParams().height; setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { FloatWindowManager.instance(context).createFloatMenu(); return true; } }); } }
自定义的View除了加载了一个布局,就是设置了一个Touch监听器,用于点击悬浮窗弹出菜单。注意这里要使用 view.getLayoutParams() 来获取视图的宽和高,因为在构造方法中,这个View并没有被measure完成,所以采用view.getHeight得到的宽高是0。
创建菜单的方法类似,同样通过WindowManager:
public void createFloatMenu() { if (menuLayout != null) return; Log.d(TAG, "create float menu"); WindowManager windowManager = getWindowManger(context); if (menuLayout == null){ menuLayout = new MenuLayout(context); menuLayoutParams = new WindowManager.LayoutParams(); menuLayoutParams.type = WindowManager.LayoutParams.TYPE_PHONE; menuLayoutParams.format = PixelFormat.RGBA_8888; } windowManager.addView(menuLayout,menuLayoutParams); }
自定义的菜单将背景设置成半透明,同时分成上下两部分,上部分点击删除菜单,下部分是一些展示的内容:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:background="#96000000" android:layout_height="match_parent"> <LinearLayout android:layout_width="match_parent" android:id="@+id/trans_part" android:orientation="horizontal" android:layout_weight="1" android:layout_height="0dp"></LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_weight="1" android:background="@color/colorPrimary" android:layout_height="0dp"> <TextView android:layout_width="match_parent" android:text="存放content" android:layout_height="match_parent" /> </LinearLayout> </LinearLayout>
public class MenuLayout extends LinearLayout { public MenuLayout(final Context context) { super(context); LayoutInflater.from(context).inflate(R.layout.transparent_layout,this); View view = findViewById(R.id.trans_part); view.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { FloatWindowManager.instance(context).removeMenuLayout(); } }); } }
可以看见,实现悬浮窗,其实就是通过windowManager.addView 时,在LayoutParam 的type设置为TYPE_PHONE,这样你的视图就是系统级视图,可以覆盖在全部程序的最上面。其余的,更多的是自定义View的知识。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持我们。
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