android emulato Android emulator浮窗

转载

码海航行侠 2023-07-25 22:55:42

文章标签 android emulato android 悬浮窗 ide 文章分类 Android 移动开发

悬浮窗的实现需要用到service，这样按下Home退出到桌面的时候，悬浮窗还可以作为程序后台，继续显示在屏幕上，如果不清后台，它会一直在那里哈。注意要在AndroidManifest.xml里注册service哈

我们借助WindowManager来生成悬浮窗
WindowManager的三个最常用方法为：

addView 添加View
addView(View view, WindowManager.LayoutParams params);
View就是要添加到windowmanager中的对象，而params是窗口的设置参数，这个我们讲到代码阶段再说。
removeView 移除View removeView(View view); 从windowmanager中移除对象。
updateViewLayout刷新View updateViewLayout(View view,
ViewGroup.LayoutParams params); 也是两个参数，一个View一个params，参考addView。

悬浮窗的布局就是通过addView添加、悬浮窗更改位置通过updateViewLayout进行刷新、关闭悬浮窗时调用removeView。

我们需要申请权限
悬浮窗需要在别的应用之上显示控件，很显然，这需要某些权限才可以。
　　在API Level >= 23的时候，需要在AndroidManefest.xml文件中声明权限SYSTEM_ALERT_WINDOW才能在其他应用上绘制控件。

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

除了这个权限外，我们还需要在系统设置里面对本应用进行设置悬浮窗权限。该权限在应用中需要启动Settings.ACTION_MANAGE_OVERLAY_PERMISSION来让用户手动设置权限。

startActivityForResult(new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION, Uri.parse("package:" + getPackageName())), REQUEST_CODE);

窗口类型很重要
LayoutParam里的type变量。这个变量是用来指定窗口类型的。在设置这个变量时，需要注意一个坑，那就是需要对不同版本的Android系统进行适配。

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    layoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
} else {
    layoutParams.type = WindowManager.LayoutParams.TYPE_PHONE;
}

在Android 8.0之前，悬浮窗口设置可以为TYPE_PHONE，这种类型是用于提供用户交互操作的非应用窗口。
　　而Android 8.0对系统和API行为做了修改，如果需要实现在其他应用和窗口上方显示提醒窗口，那么必须为TYPE_APPLICATION_OVERLAY的类型。

具体代码分析
layout
这里实现3种悬浮窗:悬浮Button(java代码直接实现，不写入layout)，悬浮imagView，悬浮surfaceView
activity_main.xml就在主活动排3个按钮，点击按钮打开对应的悬浮窗

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:orientation="vertical">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="start floating button"
        android:onClick="startFloatingButtonService" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="start floating image display"
        android:onClick="startFloatingImageDisplayService"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="start floating video player"
        android:onClick="startFloatingVideoService"/>

</LinearLayout>

image_display.xml是imgeView类型的悬浮窗

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ImageView
        android:id="@+id/image_display_imageview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

video_display.xml是surfaceView类型的悬浮窗

<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <SurfaceView
        android:id="@+id/video_display_surfaceview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</FrameLayout>

如果使用FrameLayout就可以在悬浮窗上面加控件了Ho~

在启动服务之前，需要在活动里先判断一下当前是否允许开启悬浮窗。
MainActivity.java

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == 0) {
            if (!Settings.canDrawOverlays(this)) {
                Toast.makeText(this, "授权失败", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(this, "授权成功", Toast.LENGTH_SHORT).show();
                startService(new Intent(MainActivity.this, FloatingButtonService.class));
            }
        } else if (requestCode == 1) {
            if (!Settings.canDrawOverlays(this)) {
                Toast.makeText(this, "授权失败", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(this, "授权成功", Toast.LENGTH_SHORT).show();
                startService(new Intent(MainActivity.this, FloatingImageDisplayService.class));
            }
        } else if (requestCode == 2) {
            if (!Settings.canDrawOverlays(this)) {
                Toast.makeText(this, "授权失败", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(this, "授权成功", Toast.LENGTH_SHORT).show();
                startService(new Intent(MainActivity.this, FloatingVideoService.class));
            }
        }
    }

    public void startFloatingButtonService(View view) {
        if (FloatingButtonService.isStarted) {
            return;
        }
        if (!Settings.canDrawOverlays(this)) {
            Toast.makeText(this, "当前无权限，请授权", Toast.LENGTH_SHORT);
            startActivityForResult(new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION, Uri.parse("package:" + getPackageName())), 0);
        } else {
            startService(new Intent(MainActivity.this, FloatingButtonService.class));
        }
    }

    public void startFloatingImageDisplayService(View view) {
        if (FloatingImageDisplayService.isStarted) {
            return;
        }
        if (!Settings.canDrawOverlays(this)) {
            Toast.makeText(this, "当前无权限，请授权", Toast.LENGTH_SHORT);
            startActivityForResult(new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION, Uri.parse("package:" + getPackageName())), 1);
        } else {
            startService(new Intent(MainActivity.this, FloatingImageDisplayService.class));
        }
    }

    public void startFloatingVideoService(View view) {
        if (FloatingVideoService.isStarted) {
            return;
        }
        if (!Settings.canDrawOverlays(this)) {
            Toast.makeText(this, "当前无权限，请授权", Toast.LENGTH_SHORT);
            startActivityForResult(new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION, Uri.parse("package:" + getPackageName())), 2);
        } else {
            startService(new Intent(MainActivity.this, FloatingVideoService.class));
        }
    }
}

悬浮Button的service
FloatingButtonService.java

public class FloatingButtonService extends Service {
    public static boolean isStarted = false;

    private WindowManager windowManager;
    private WindowManager.LayoutParams layoutParams;

    private Button button;

    @Override
    public void onCreate() {
        super.onCreate();
        isStarted = true;
        // 获取WindowManager服务
        windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
         // 设置LayoutParam
        layoutParams = new WindowManager.LayoutParams();
        //设置type
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            layoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
        } else {
            layoutParams.type = WindowManager.LayoutParams.TYPE_PHONE;
        }
        //设置效果为背景透明.
        layoutParams.format = PixelFormat.RGBA_8888;
        //设置窗口初始停靠位置.
        layoutParams.gravity = Gravity.LEFT | Gravity.TOP;
        //设置flags.不可聚焦及不可使用按钮对悬浮窗进行操控.
        layoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
        //设置悬浮窗口长宽数据.
        //注意，这里的width和height均使用px而非dp
        //如果你想完全对应布局设置，需要先获取到机器的dpi
        //px与dp的换算为px = dp * (dpi / 160).
        layoutParams.width = 500;
        layoutParams.height = 100;
        layoutParams.x = 300;
        layoutParams.y = 300;
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        showFloatingWindow();
        return super.onStartCommand(intent, flags, startId);
    }

    private void showFloatingWindow() {
        if (Settings.canDrawOverlays(this)) {
         // 新建悬浮窗控件
            button = new Button(getApplicationContext());
            button.setText("Floating Window");
            button.setBackgroundColor(Color.BLUE);
            // 将悬浮窗控件添加到WindowManager
            windowManager.addView(button, layoutParams);

            button.setOnTouchListener(new FloatingOnTouchListener());
        }
    }
    
//拖动悬浮窗
    private class FloatingOnTouchListener implements View.OnTouchListener {
        private int x;
        private int y;

        @Override
        public boolean onTouch(View view, MotionEvent event) {
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    x = (int) event.getRawX();
                    y = (int) event.getRawY();
                    break;
                case MotionEvent.ACTION_MOVE:
                    int nowX = (int) event.getRawX();
                    int nowY = (int) event.getRawY();
                    int movedX = nowX - x;
                    int movedY = nowY - y;
                    x = nowX;
                    y = nowY;
                    layoutParams.x = layoutParams.x + movedX;
                    layoutParams.y = layoutParams.y + movedY;
                     // 更新悬浮窗控件布局，只有调用了这个方法，悬浮窗的位置才会发生改变
                    windowManager.updateViewLayout(view, layoutParams);
                    break;
                default:
                    break;
            }
            return false;
        }
    }
}

format 用于设置显示的格式。RGBA_8888是透明型，也是最常用到的。
flags 这是很重要的一个设置。FLAG_NOT_FOCUSABLE设置了不可聚焦。同时经常用的还有FLAG_WATCH_OUTSIDE_TOUCH，这个设置可以让悬浮窗接收到外部点击事件，如果你想在之后做小悬浮窗点击变大，再点击悬浮窗之外又变回小悬浮窗。这个可以用到。多个FLAG的话可以用|来连接，如
params.flags = FLAG_NOT_FOCUSABLE | FLAG_WATCH_OUTSIDE_TOUCH
gravity 用于设置窗口的初始停靠位置。我们设置的是让它初始在最左&最上方生成，后面两句是定义这里的xy值都为0。
width&height用于设置悬浮窗口的大小，建议设置成和布局一样大最好。小于布局会把里面的组件进行挤压。

接下来是悬浮ImagView的service了，它还可以每隔两秒更换一张图片
FloatingImageDisplayService.java

public class FloatingImageDisplayService extends Service {
    public static boolean isStarted = false;

    private WindowManager windowManager;
    private WindowManager.LayoutParams layoutParams;

    private View displayView;

    private int[] images;
    private int imageIndex = 0;

    private Handler changeImageHandler;

    @Override
    public void onCreate() {//创建服务
        super.onCreate();
        isStarted = true;
        windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
        layoutParams = new WindowManager.LayoutParams();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            layoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
        } else {
            layoutParams.type = WindowManager.LayoutParams.TYPE_PHONE;
        }
        layoutParams.format = PixelFormat.RGBA_8888;
        layoutParams.gravity = Gravity.LEFT | Gravity.TOP;
        layoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
        layoutParams.width = 500;
        layoutParams.height = 500;
        layoutParams.x = 300;
        layoutParams.y = 300;

        images = new int[] {
                R.drawable.image_01,
                R.drawable.image_02,
                R.drawable.image_03,
                R.drawable.image_04,
                R.drawable.image_05,
        };
//借助Handler定时传递消息机制来实现定时切换图片的机制
        changeImageHandler = new Handler(this.getMainLooper(),changeImageCallback);
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        showFloatingWindow();//启动服务
        return super.onStartCommand(intent, flags, startId);
    }

    private void showFloatingWindow() {
        if (Settings.canDrawOverlays(this)) { //如果允许了悬浮窗
            LayoutInflater layoutInflater = LayoutInflater.from(this);//获取LayoutInflater对象
            displayView = layoutInflater.inflate(R.layout.image_display, null);
            displayView.setOnTouchListener(new FloatingOnTouchListener());
            ImageView imageView = displayView.findViewById(R.id.image_display_imageview);//初始化第一张图
            imageView.setImageResource(images[imageIndex]);
            windowManager.addView(displayView, layoutParams);

            changeImageHandler.sendEmptyMessageDelayed(0, 2000);//第一次延迟2秒发送空消息，编号为0
        }
    }

    private Handler.Callback changeImageCallback = new Handler.Callback() {
        @Override
        public boolean handleMessage(Message msg) {
            if (msg.what == 0) {//Handler接收消息判断
                imageIndex++;
                if (imageIndex >= 5) {
                    imageIndex = 0;
                }
                if (displayView != null) {
                    ((ImageView) displayView.findViewById(R.id.image_display_imageview)).setImageResource(images[imageIndex]);//更新UI图
                }

                changeImageHandler.sendEmptyMessageDelayed(0, 2000);//图换完了，再发一条消息
            }
            return false;//否则没有接受消息
        }
    };
//悬浮窗拖动操作部分代码完全不变
    private class FloatingOnTouchListener implements View.OnTouchListener {
        private int x;
        private int y;

        @Override
        public boolean onTouch(View view, MotionEvent event) {
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    x = (int) event.getRawX();
                    y = (int) event.getRawY();
                    break;
                case MotionEvent.ACTION_MOVE:
                    int nowX = (int) event.getRawX();
                    int nowY = (int) event.getRawY();
                    int movedX = nowX - x;
                    int movedY = nowY - y;
                    x = nowX;
                    y = nowY;
                    layoutParams.x = layoutParams.x + movedX;
                    layoutParams.y = layoutParams.y + movedY;
                    windowManager.updateViewLayout(view, layoutParams);
                    break;
                default:
                    break;
            }
            return false;
        }
    }
}

最后是SurfaceView的service了，我们用它来实现播放小视频
大同小异

public class FloatingVideoService extends Service {
    public static boolean isStarted = false;

    private WindowManager windowManager;
    private WindowManager.LayoutParams layoutParams;

    private MediaPlayer mediaPlayer;
    private View displayView;

    @Override
    public void onCreate() {
        super.onCreate();
        isStarted = true;
        windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
        layoutParams = new WindowManager.LayoutParams();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            layoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
        } else {
            layoutParams.type = WindowManager.LayoutParams.TYPE_PHONE;
        }
        layoutParams.format = PixelFormat.RGBA_8888;
        layoutParams.gravity = Gravity.LEFT | Gravity.TOP;
        layoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
        layoutParams.width = 800;
        layoutParams.height = 450;
        layoutParams.x = 300;
        layoutParams.y = 300;

        mediaPlayer = new MediaPlayer();//创建媒体播放器对象
    }

    @Nullable//表示可以为空
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        showFloatingWindow();
        return super.onStartCommand(intent, flags, startId);
    }

    private void showFloatingWindow() {
        if (Settings.canDrawOverlays(this)) {
            LayoutInflater layoutInflater = LayoutInflater.from(this);
            displayView = layoutInflater.inflate(R.layout.video_display, null);
            displayView.setOnTouchListener(new FloatingOnTouchListener());
            mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
            SurfaceView surfaceView = displayView.findViewById(R.id.video_display_surfaceview);
            final SurfaceHolder surfaceHolder = surfaceView.getHolder();
            surfaceHolder.addCallback(new SurfaceHolder.Callback() {
                @Override
                public void surfaceCreated(SurfaceHolder holder) {
                    mediaPlayer.setDisplay(surfaceHolder);
                }

                @Override
                public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

                }

                @Override
                public void surfaceDestroyed(SurfaceHolder holder) {

                }
            });
            mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                @Override
                public void onPrepared(MediaPlayer mp) {
                    mediaPlayer.start();
                }
            });
            try {
                mediaPlayer.setDataSource(this, Uri.parse("https://raw.githubusercontent.com/dongzhong/ImageAndVideoStore/master/Bruno%20Mars%20-%20Treasure.mp4"));
                mediaPlayer.prepareAsync();
            }
            catch (IOException e) {
                Toast.makeText(this, "无法打开视频源", Toast.LENGTH_LONG).show();
            }
            windowManager.addView(displayView, layoutParams);
        }
    }
    
//拖动悬浮窗部分代码 完全不变
    private class FloatingOnTouchListener implements View.OnTouchListener {
        private int x;
        private int y;

        @Override
        public boolean onTouch(View view, MotionEvent event) {
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    x = (int) event.getRawX();
                    y = (int) event.getRawY();
                    break;
                case MotionEvent.ACTION_MOVE:
                    int nowX = (int) event.getRawX();
                    int nowY = (int) event.getRawY();
                    int movedX = nowX - x;
                    int movedY = nowY - y;
                    x = nowX;
                    y = nowY;
                    layoutParams.x = layoutParams.x + movedX;
                    layoutParams.y = layoutParams.y + movedY;
                    windowManager.updateViewLayout(view, layoutParams);
                    break;
                default:
                    break;
            }
            return true;
        }
    }
}

本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。