Android 悬浮窗口

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;

    }

    @Override

    public 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);

    }

    @Override

    public 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" >

    <ImageButton

        android: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" />

    <TextView

        android: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;

    @Override

    public 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);

    }

    @Override

    public void onDestroy() {

        super.onDestroy();

        if (mFloatView != null) {

            mWindowManager.removeView(mFloatView);

            mFloatView = null;

        }

    }

    @Override

    public IBinder onBind(Intent arg0) {

        return null;

    }

    private OnClickListener mClickListener = new OnClickListener() {

        @Override

        public 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;

    @Override

    protected 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);

    }

    @Override

    protected void onDestroy() {

        // TODO Auto-generated method stub

        super.onDestroy();

        if (mFloatView != null) {

            WindowManager windowManager = getWindow().getWindowManager();

            windowManager.removeView(mFloatView);

            mFloatView = null;

        }

    }

    private OnClickListener mClickListener = new OnClickListener() {

        @Override

        public 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" />