Android 实现可任意拖动的悬浮窗功能(类似悬浮球）

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() - mOffsetToParent);
mLayoutParams.y = (int) (event.getRawY() - mOffsetToParentY);
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()
);
}
}

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;
}
}

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();
}
}

<?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