Android 悬浮窗口
一.创建悬浮窗口步骤
1.实现一个ViewGroup类,作为悬浮窗口的界面类,以便在里面重写onInterceptTouchEvent和onTouchEvent方法,实现移动界面的目的.
在本例中实现了一个FloatLayer类,可以作为通用的类,使用时需要传入WindowManager对象以实现移动窗口.
// FloatLayer ~ package com.example.hellofloatingwnd;import static com.ahai.util.DebugMessage.d; import android.content.Context; import android.graphics.PixelFormat; import android.util.AttributeSet; import android.view.Gravity; import android.view.MotionEvent; import android.view.WindowManager; import android.widget.RelativeLayout;public class FloatLayer extends RelativeLayout {// flags: 须设置成 FLAG_NOT_FOCUSABLE, 否则悬浮窗口下面的窗口不能取得焦点, 无法响应触摸事件// type: 值低的窗口在值高的下层,相同的 type值,后创建的窗口显示在先创建的窗口上面.// 对应的type需要相应的权限,否则会报异常 BadTokenException.// 对于权限 android.permission.SYSTEM_ALERT_WINDOW 可使用以下几个值:// TYPE_PHONE, TYPE_SYSTEM_ALERT, TYPE_TOAST, TYPE_SYSTEM_OVERLAY// 其中 TYPE_TOAST, TYPE_SYSTEM_OVERLAY 不能响应触摸事件public static class FloatLayoutParams extends WindowManager.LayoutParams {public FloatLayoutParams() {super(TYPE_PHONE, FLAG_NOT_FOCUSABLE, PixelFormat.RGBA_8888);gravity = Gravity.LEFT | Gravity.TOP;}public FloatLayoutParams(int type) {super(type, FLAG_NOT_FOCUSABLE, PixelFormat.RGBA_8888);gravity = Gravity.LEFT | Gravity.TOP;}public FloatLayoutParams(int xpos, int ypos) {super(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, xpos,ypos, TYPE_PHONE, FLAG_NOT_FOCUSABLE, PixelFormat.RGBA_8888);gravity = Gravity.LEFT | Gravity.TOP;}public FloatLayoutParams(int xpos, int ypos, int type) {super(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, xpos,ypos, type, FLAG_NOT_FOCUSABLE, PixelFormat.RGBA_8888);gravity = Gravity.LEFT | Gravity.TOP;}}private WindowManager mWindowManager;private int mStatusBarHeight;private int mMoveX;private int mMoveY;public FloatLayer(Context context, AttributeSet attrs, int defStyleAttr,int defStyleRes) {super(context, attrs, defStyleAttr, defStyleRes);mStatusBarHeight = getStatusBarHeight();}public FloatLayer(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);mStatusBarHeight = getStatusBarHeight();}public FloatLayer(Context context, AttributeSet attrs) {super(context, attrs);mStatusBarHeight = getStatusBarHeight();}public FloatLayer(Context context) {super(context);mStatusBarHeight = getStatusBarHeight();}public void setWindowManager(WindowManager windowManager) {mWindowManager = windowManager;}/** 取得系统状态栏的高度 */private int getStatusBarHeight() {int statusBarHeight = 0;int resourceId = getResources().getIdentifier("status_bar_height","dimen", "android");if (resourceId > 0) {statusBarHeight = getResources().getDimensionPixelSize(resourceId);}// d("statusBarHeight=" + statusBarHeight);return statusBarHeight;}@Overridepublic boolean onInterceptTouchEvent(MotionEvent event) {final int action = event.getAction();if (action == MotionEvent.ACTION_MOVE) {if (handleMoveEvent(event))return true;} else if (action == MotionEvent.ACTION_DOWN) {mMoveX = (int) event.getRawX();mMoveY = (int) event.getRawY();}return super.onInterceptTouchEvent(event);}@Overridepublic boolean onTouchEvent(MotionEvent event) {final int action = event.getAction();if (action == MotionEvent.ACTION_MOVE) {if (handleMoveEvent(event))return true;} else if (action == MotionEvent.ACTION_DOWN) {mMoveX = (int) event.getRawX();mMoveY = (int) event.getRawY();}return super.onTouchEvent(event);}private boolean handleMoveEvent(MotionEvent event) {try {if (mWindowManager != null) {// 通过以下消息可知getLayoutParams得到的对象即为 addView 传入的 LayoutParams 对象// d("class:" + getLayoutParams().getClass());final int x = (int) event.getRawX();final int y = (int) event.getRawY();int[] location = new int[2];getLocationOnScreen(location);FloatLayoutParams layoutParams = (FloatLayoutParams) getLayoutParams();layoutParams.x = location[0] + (x - mMoveX);layoutParams.y = location[1] + (y - mMoveY) - mStatusBarHeight;mWindowManager.updateViewLayout(this, layoutParams);mMoveX = x;mMoveY = y;return true;}} catch (Exception e) {d("", e);}return false;} }
2.在res/layout中创建一个布局文件,实现界面布局.如float_layout.xml
<?xml version="1.0" encoding="utf-8"?> <com.example.hellofloatingwnd.FloatLayer xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="wrap_content"android:layout_height="wrap_content" ><ImageButtonandroid:id="@+id/mBtnHide"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignParentTop="true"android:layout_centerHorizontal="true"android:background="@drawable/hide_button_selector" /><TextViewandroid:id="@+id/mTvHello"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_below="@id/mBtnHide"android:layout_centerHorizontal="true"android:text="@string/hello"android:textColor="#21d" /></com.example.hellofloatingwnd.FloatLayer>
3.取得WindowManager对象.
在 Activity 中可以通过以下方法取得, 其中前面的3个方法实际取得的是当前Activity的应用程序窗口对象,在Activity销毁等情况下,
WindowManager对象也就不存在了,需要将悬浮窗口移除,否则会报错.
WindowManager windowManager;
windowManager = getWindow().getWindowManager();
windowManager = getWindowManager();
windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
windowManager = (WindowManager) getApplication().getSystemService(WINDOW_SERVICE);
在 Service 中, 以下两个方法均可, 在 onDestory 中将悬浮窗口移除即可.
windowManager = (WindowManager) getApplication().getSystemService(WINDOW_SERVICE);
windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
4.创建View并显示. 通过以下两个行代码完成:
mFloatView = (FloatLayer) inflater.inflate(R.layout.float_layout, null);
windowManager.addView(mFloatView, layoutParams);
其中layoutParams是实现悬浮窗口的关键,窗口的配置及移动都通过其指定.
LayoutParams需使用WindowManager.LayoutParams对象或继承自该类重写.
移动窗口通过下面的代码实现:
mWindowManager.updateViewLayout(mFloatView, layoutParams);
layoutParams最重要的两个参数是flags和type:
flags: 须设置成 FLAG_NOT_FOCUSABLE, 否则悬浮窗口下面的窗口不能取得焦点,不能响应触摸事件.
type: 值低的窗口在值高的下层,相同的 type值,后创建的窗口显示在先创建的窗口上面.
对应的type需要相应的权限,否则会报异常 BadTokenException.
对于权限 android.permission.SYSTEM_ALERT_WINDOW, type可使用以下几个值:
TYPE_PHONE, TYPE_SYSTEM_ALERT, TYPE_TOAST, TYPE_SYSTEM_OVERLAY
其中 TYPE_TOAST, TYPE_SYSTEM_OVERLAY 不能响应触摸事件
在Service中实现
package com.example.hellofloatingwnd;import android.app.Application; import android.app.Service; import android.content.Intent; import android.os.IBinder; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.WindowManager; import android.widget.ImageButton; import android.widget.Toast;public class FloatingService extends Service {private FloatLayer mFloatView;private WindowManager mWindowManager;private ImageButton mBtnHide;@Overridepublic void onCreate() {super.onCreate();Application app = getApplication();mWindowManager = (WindowManager) app.getSystemService(WINDOW_SERVICE);LayoutInflater inflater = LayoutInflater.from(app);mFloatView = (FloatLayer) inflater.inflate(R.layout.float_layout, null);mFloatView.setWindowManager(mWindowManager);mBtnHide = (ImageButton) mFloatView.findViewById(R.id.mBtnHide);mBtnHide.setOnClickListener(mClickListener);FloatLayer.FloatLayoutParams layoutParams;layoutParams = new FloatLayer.FloatLayoutParams(10, 100);mWindowManager.addView(mFloatView, layoutParams);}@Overridepublic void onDestroy() {super.onDestroy();if (mFloatView != null) {mWindowManager.removeView(mFloatView);mFloatView = null;}}@Overridepublic IBinder onBind(Intent arg0) {return null;}private OnClickListener mClickListener = new OnClickListener() {@Overridepublic void onClick(View view) {if (view.getId() == R.id.mBtnHide) {Toast.makeText(getApplicationContext(),"on float button clicked.", Toast.LENGTH_SHORT).show();FloatingService.this.stopSelf();}}}; }
在Activity中实现
package com.example.hellofloatingwnd;import android.app.Activity; import android.app.Application; import android.content.Intent; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.WindowManager; import android.widget.Button; import android.widget.TextView;public class MainActivity extends Activity {private Button mBtnStart;private Button mBtnStop;private FloatLayer mFloatView;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mBtnStart = (Button) findViewById(R.id.mBtnStart);mBtnStop = (Button) findViewById(R.id.mBtnStop);mBtnStart.setOnClickListener(mClickListener);mBtnStop.setOnClickListener(mClickListener);WindowManager windowManager;// windowManager = getWindow().getWindowManager();windowManager = getWindowManager();// windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);// windowManager = (WindowManager)// getApplication().getSystemService(WINDOW_SERVICE); Application application = getApplication();LayoutInflater inflater = LayoutInflater.from(application);mFloatView = (FloatLayer) inflater.inflate(R.layout.float_layout, null);mFloatView.setWindowManager(windowManager);TextView textView = (TextView) mFloatView.findViewById(R.id.mTvHello);textView.setText("This create by activity.");FloatLayer.FloatLayoutParams layoutParams;layoutParams = new FloatLayer.FloatLayoutParams(50, 200);windowManager.addView(mFloatView, layoutParams);}@Overrideprotected void onDestroy() {// TODO Auto-generated method stubsuper.onDestroy();if (mFloatView != null) {WindowManager windowManager = getWindow().getWindowManager();windowManager.removeView(mFloatView);mFloatView = null;}}private OnClickListener mClickListener = new OnClickListener() {@Overridepublic void onClick(View view) {if (view.getId() == R.id.mBtnStart) {Intent intent = new Intent(MainActivity.this,FloatingService.class);startService(intent);} else if (view.getId() == R.id.mBtnStop) {Intent intent = new Intent(MainActivity.this,FloatingService.class);stopService(intent);}}}; }
5.在AndroidManifest.xml文件中添加权限,在layoutParams中配置不同的type类型需要不同的权限.
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
