安卓app内部实现一个全局的悬浮按钮，类似于360的悬浮球可在app内部所有界面显示。主要还是来源于网上搜索的，经过自己整合和修改！效果如图，主要是一个工具类，
代码如下：
import android.content.Context;
import android.graphics.Color;
import android.graphics.PixelFormat;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import com.mocoo.ezc.R;
import com.mocoo.ezc.utils.Log;
import com.mocoo.ezc.utils.SPUtil;
public class FloatView2 {
private Context c;
private int height=0;
private int width=0;
public FloatView2(Context c) {
this.c=c;
}
private WindowManager wm;
private View view;// 浮动按钮
WindowManager.LayoutParams params;
/**
* 添加悬浮View
* @param
*/
public void createFloatView() {
wm = (WindowManager) c.getSystemService(Context.WINDOW_SERVICE);
height = wm.getDefaultDisplay().getHeight();
width = wm.getDefaultDisplay().getWidth();
view = LayoutInflater.from(c).inflate(R.layout.floatview, null);
params = new WindowManager.LayoutParams();
params.type = WindowManager.LayoutParams.TYPE_BASE_APPLICATION;// 所有程序窗口的“基地”窗口，其他应用程序窗口都显示在它上面。
params.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
| WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
params.format = PixelFormat.TRANSLUCENT;// 不设置这个弹出框的透明遮罩显示为黑色
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
params.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
}else {
params.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;
}
params.width = WindowManager.LayoutParams.WRAP_CONTENT;
params.height = WindowManager.LayoutParams.WRAP_CONTENT;
params.gravity = Gravity.TOP | Gravity.LEFT;
int screenWidth = c.getResources().getDisplayMetrics().widthPixels;
int screenHeight = c.getResources().getDisplayMetrics().heightPixels;
params.y = screenHeight- height/3;//设置距离底部高度为屏幕三分之一
params.x = screenWidth;
view.setBackgroundColor(Color.TRANSPARENT);
view.setVisibility(View.VISIBLE);
view.setOnTouchListener(new View.OnTouchListener() {
// 触屏监听
float lastX, lastY;
int oldOffsetX, oldOffsetY;
int tag = 0;// 悬浮球 所需成员变量
@Override
public boolean onTouch(View v, MotionEvent event) {
final int action = event.getAction();
float x = event.getX();
float y = event.getY();
if (tag == 0) {
oldOffsetX = params.x; // 偏移量
oldOffsetY = params.y; // 偏移量
}
if (action == MotionEvent.ACTION_DOWN) {
lastX = x;
lastY = y;
} else if (action == MotionEvent.ACTION_MOVE) {
params.x += (int) (x - lastX) / 3; // 减小偏移量,防止过度抖动
params.y += (int) (y - lastY) / 3; // 减小偏移量,防止过度抖动
tag = 1;
wm.updateViewLayout(view, params);
} else if (action == MotionEvent.ACTION_UP) {
int newOffsetX = params.x;
int newOffsetY = params.y;
// 只要按钮一动位置不是很大,就认为是点击事件
if (Math.abs(oldOffsetX - newOffsetX) <= 20
&& Math.abs(oldOffsetY - newOffsetY) <= 20) {
if(l != null){
l.onClick(view);
}
} else {
if( params.x < width/2){
params.x=0;
}else{
params.x=width;
}
wm.updateViewLayout(view, params);
tag = 0;
}
}
return true;
}
});
wm.addView(view, params);
}
/**
* 点击浮动按钮触发事件，需要override该方法
*/
private View.OnClickListener l;
public void onFloatViewClick(View.OnClickListener l) {
this.l=l;
}
/**
* 将悬浮View从WindowManager中移除，需要与createFloatView()成对出现
*/
public void removeFloatView() {
if (wm != null && view != null) {
wm.removeViewImmediate(view);
// wm.removeView(view);//不要调用这个，WindowLeaked
view = null;
wm = null;
}
}
/**
* 隐藏悬浮View
*/
public void hideFloatView() {
if (wm != null && view != null&&view.isShown()) {
view.setVisibility(View.GONE);
}
}
/**
* 显示悬浮View
*/
public void showFloatView(){
if (wm != null && view != null&&!view.isShown()) {
view.setVisibility(View.VISIBLE);
}
}
public void updateViewLayout(){
if(wm !=null){
int screenWidth = (int)SPUtil.get("ParamsX",0);
int screenHeight = (int)SPUtil.get("ParamsY",0);
if(screenWidth == 0){
screenWidth = c.getResources().getDisplayMetrics().widthPixels;
}
if(screenHeight == 0){
screenHeight = c.getResources().getDisplayMetrics().heightPixels;
params.y = screenHeight- height/3;//设置距离底部高度为屏幕三分之一
}else{
params.y = screenHeight;
}
params.x = screenWidth;
wm.updateViewLayout(view, params);
}
}
}
//8.0系统加强后台管理，禁止在其他应用和窗口弹提醒弹窗，如果要弹，必须使用TYPE_APPLICATION_OVERLAYif(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { dialog.getWindow().setType((WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY));}else{ dialog.getWindow().setType((WindowManager.LayoutParams.TYPE_SYSTEM_ALERT));}用法如下（可直接在MainActivi的onCreate里面直接创建，在destory记得调用removeFloatView()方法）：
floatView2 = new FloatView2(this);
floatView2.createFloatView();
floatView2.onFloatViewClick(new View.OnClickListener() {
@Override
public void onClick(View v) {
//这边是点击悬浮按钮的响应事件
}
到这这里悬浮按钮基本可以实现，剩下一个问题就是当app没有退掉直接点击Home键返回桌面，悬浮按钮仍可以显示，这里看需求是否需要我这里是不需要所以我做了处理，在Application里面做了一个监听，当退到后台发送一个广播到MainActivity里面调用hide的方法进行隐藏，回到前台再调用show的方法进行显示，MainActivity里面广播接受的方法就不贴了：
registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks() {
@Override
public void onActivityStopped(Activity activity) {
Log.v("viclee", activity + "onActivityStopped");
count--;
if (count == 0) {
Intent intent = new Intent();
intent.putExtra("isRunningForeground", true);
intent.setAction("com.mocoo.ezc.floatView");
sendBroadcast(intent);
Log.v("viclee", ">>>>>>>>>>>>>>>>>>>切到后台 lifecycle");
}
}
@Override
public void onActivityStarted(Activity activity) {
Log.v("viclee", activity + "onActivityStarted");
if (count == 0) {
Intent intent = new Intent();
intent.putExtra("isRunningForeground", false);
intent.setAction("com.mocoo.ezc.floatView");
sendBroadcast(intent);
Log.v("viclee", ">>>>>>>>>>>>>>>>>>>切到前台 lifecycle");
}
count++;
}
@Override
public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
Log.v("viclee", activity + "onActivitySaveInstanceState");
}
@Override
public void onActivityResumed(Activity activity) {
Log.v("viclee", activity + "onActivityResumed");
}
@Override
public void onActivityPaused(Activity activity) {
Log.v("viclee", activity + "onActivityPaused");
}
@Override
public void onActivityDestroyed(Activity activity) {
Log.v("viclee", activity + "onActivityDestroyed");
}
@Override
public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
Log.v("viclee", activity + "onActivityCreated");
}
});
如果有什么更好的优化方法请告知！谢谢
