Android(安卓)可任意拖动的悬浮窗(类似悬浮球）

最近开发项目中，有个在屏幕上任意拖动的悬浮窗功能，其实就是利用 WindowManager的api来完成这个需求，具体的实现的功能如下：
1.自定义view

import android.content.Context;import android.content.Intent;import android.os.Handler;import android.os.Message;import android.util.Log;import android.util.TypedValue;import android.view.MotionEvent;import android.view.View;import android.view.ViewConfiguration;import android.view.WindowManager;import android.widget.LinearLayout;import com.xinrui.recordscreen.R;import java.lang.reflect.Field;/** * */public class RecordScreenView extends LinearLayout implements View.OnClickListener{    private WindowManager mWindowManager;    private WindowManager.LayoutParams mLayoutParams;    private long mLastDownTime;    private float mLastDownX;    private float mLastDownY;    private boolean mIsLongTouch;    private boolean mIsTouching;    private float mTouchSlop;    private final static long LONG_CLICK_LIMIT = 20;    private final static int TIME_COUNT = 0;    private int mStatusBarHeight;    private int mCurrentMode,time=0;    private final static int MODE_NONE = 0x000;    private final static int MODE_MOVE = 0x001;    private int mOffsetToParent;    private int mOffsetToParentY;    private Context mContext;    public RecordScreenView(Context context) {        super(context);        this.mContext=context;        mWindowManager = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);        initView();    }    private void initView() {        View view = inflate(getContext(), R.layout.layout_ball, this)；        mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();        mCurrentMode = MODE_NONE;        recordtime(0);        mStatusBarHeight = getStatusBarHeight();        mOffsetToParent = dip2px(25);        mOffsetToParentY = mStatusBarHeight + mOffsetToParent;        view.setOnTouchListener(new OnTouchListener() {            @Override            public boolean onTouch(View v, final MotionEvent event) {                switch (event.getAction()) {                    case MotionEvent.ACTION_DOWN:                        mIsTouching = true;                        mLastDownTime = System.currentTimeMillis();                        mLastDownX = event.getX();                        mLastDownY = event.getY();                        postDelayed(new Runnable() {                            @Override                            public void run() {                                if (isLongTouch()) {                                    mIsLongTouch = true;                                }                            }                        }, LONG_CLICK_LIMIT);                        break;                    case MotionEvent.ACTION_MOVE:                        if (!mIsLongTouch && isTouchSlop(event)) {                            return true;                        }                        if (mIsLongTouch && (mCurrentMode == MODE_NONE || mCurrentMode == MODE_MOVE)) {                            mLayoutParams.x = (int) (event.getRawX() - mLastDownX);                            mLayoutParams.y = (int) (event.getRawY() - mLastDownY);                            mWindowManager.updateViewLayout(RecordScreenView.this, mLayoutParams);//不断刷新悬浮窗的位置                            mCurrentMode = MODE_MOVE;                        }                        break;                    case MotionEvent.ACTION_CANCEL:                    case MotionEvent.ACTION_UP:                        mIsTouching = false;                        if (mIsLongTouch) {                            mIsLongTouch = false;                        }                        mCurrentMode = MODE_NONE;                        break;                }                return true;            }        });    }    private boolean isLongTouch() {        long time = System.currentTimeMillis();        if (mIsTouching && mCurrentMode == MODE_NONE && (time - mLastDownTime >= LONG_CLICK_LIMIT)) {            return true;        }        return false;    }    /**     * 判断是否是轻微滑动     *     * @param event     * @return     */    private boolean isTouchSlop(MotionEvent event) {        float x = event.getX();        float y = event.getY();        if (Math.abs(x - mLastDownX) < mTouchSlop && Math.abs(y - mLastDownY) < mTouchSlop) {            return true;        }        return false;    }    public void setLayoutParams(WindowManager.LayoutParams params) {        mLayoutParams = params;    }    /**     * 获取通知栏高度     *     * @return     */    private int getStatusBarHeight() {        int statusBarHeight = 0;        try {            Class<?> c = Class.forName("com.android.internal.R$dimen");            Object o = c.newInstance();            Field field = c.getField("status_bar_height");            int x = (Integer) field.get(o);            statusBarHeight = getResources().getDimensionPixelSize(x);        } catch (Exception e) {            e.printStackTrace();        }        return statusBarHeight;    }    public int dip2px(float dip) {        return (int) TypedValue.applyDimension(                TypedValue.COMPLEX_UNIT_DIP, dip, getContext().getResources().getDisplayMetrics()        );    }}

2.添加windowManager添加view

import android.content.Context;import android.graphics.PixelFormat;import android.view.Gravity;import android.view.WindowManager;import android.view.WindowManager.LayoutParams;/** * Created by wangxiandeng on 2016/11/25. */public class FloatWindowManager {    private static RecordScreenView mBallView;    private static WindowManager mWindowManager;    public static void addBallView(Context context) {        if (mBallView == null) {            WindowManager windowManager = getWindowManager(context);            int screenWidth = windowManager.getDefaultDisplay().getWidth();            int screenHeight = windowManager.getDefaultDisplay().getHeight();            mBallView = new RecordScreenView(context);            LayoutParams params = new LayoutParams();            params.x = screenWidth/2;            params.y = screenHeight/2+150;            params.width = LayoutParams.WRAP_CONTENT;            params.height = LayoutParams.WRAP_CONTENT;            params.gravity = Gravity.LEFT | Gravity.TOP;            params.type = LayoutParams.TYPE_APPLICATION_OVERLAY;            params.format = PixelFormat.RGBA_8888;            params.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL                    | LayoutParams.FLAG_NOT_FOCUSABLE;            mBallView.setLayoutParams(params);            windowManager.addView(mBallView, params);        }    }    public static void removeBallView(Context context) {        if (mBallView != null) {            WindowManager windowManager = getWindowManager(context);            windowManager.removeView(mBallView);            mBallView = null;        }    }    private static WindowManager getWindowManager(Context context) {        if (mWindowManager == null) {            mWindowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);        }        return mWindowManager;    }}

3.Acitivity中调用

import android.app.Activity;import android.content.Intent;import android.os.Build;import android.os.Bundle;import android.provider.Settings;import android.util.Log;import android.widget.Toast;import com.xinrui.recordscreen.view.FloatWindowManager;public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        if (Build.VERSION.SDK_INT >= 23) {        //设置中请求开启悬浮窗权限            if (!Settings.canDrawOverlays(this)) {                Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION);                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);                startActivity(intent);                Toast.makeText(this, MainActivity.this.getResources().getString(R.string.open_float), Toast.LENGTH_SHORT).show();            }else{                initView();            }        }    }    private void initView() {        FloatWindowManager.addBallView(MainActivity.this);        finish();    }}

5.AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.xinrui.recordscreen">    <uses-permission android:name="android.permission.INTERNET"/>    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>//悬浮窗权限    <application        android:allowBackup="true"        android:icon="@drawable/recording_screen_nor"        android:label="@string/app_name"        android:supportsRtl="true">        <activity android:name="com.xinrui.recordscreen.MainActivity">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity></manifest>

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