WindowManager基础
一.源码传送门：
WindowManager 此文是在此基础上做的讲解,用于加深印象
二.WindowManager介绍
Android为我们提供的用于与窗口管理器进行交互的一个API！我们都知道App的界面都是 由一个个的Acitivty组成，而Activity又由View组成，当我们想显示一个界面的时候， 第一时间想起的是:Activity，对吧？又或者是Dialog和Toast。
但是有些情况下，前面这三者可能满足不了我们的需求，比如我们仅仅是一个简单的显示 用Activity显得有点多余了，而Dialog又需要Context对象，Toast又不可以点击… 对于以上的情况我们可以利用WindowManager这个东东添加View到屏幕上， 或者从屏幕上移除View！他就是管理Android窗口机制的一个接口，显示View的最底层！
三.如何获得WindowManager实例
获得WindowManager对象:
WindowManager wManager = getApplicationContext().getSystemService(Context. WINDOW_ SERVICE);获得WindowManager.LayoutParams对象，为后续操作做准备
WindowManager.LayoutParams wmParams=new WindowManager.LayoutParams();四.WindowManager使用实例：
实例1：获取屏幕宽高
/**
* Return the width of screen, in pixel.
*
* @return the width of screen, in pixel
*/
public static int getScreenWidth() {
WindowManager wm = (WindowManager) getApp().getSystemService(Context.WINDOW_SERVICE);
if (wm == null) return -1;
Point point = new Point();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
wm.getDefaultDisplay().getRealSize(point);
} else {
wm.getDefaultDisplay().getSize(point);
}
return point.x;
}
/**
* Return the height of screen, in pixel.
*
* @return the height of screen, in pixel
*/
public static int getScreenHeight() {
WindowManager wm = (WindowManager) getApp().getSystemService(Context.WINDOW_SERVICE);
if (wm == null) return -1;
Point point = new Point();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
wm.getDefaultDisplay().getRealSize(point);
} else {
wm.getDefaultDisplay().getSize(point);
}
return point.y;
}
/**
* Return the application's width of screen, in pixel.
*
* @return the application's width of screen, in pixel
*/
public static int getAppScreenWidth() {
WindowManager wm = (WindowManager) getApp().getSystemService(Context.WINDOW_SERVICE);
if (wm == null) return -1;
Point point = new Point();
wm.getDefaultDisplay().getSize(point);
return point.x;
}
/**
* Return the application's height of screen, in pixel.
*
* @return the application's height of screen, in pixel
*/
public static int getAppScreenHeight() {
WindowManager wm = (WindowManager) getApp().getSystemService(Context.WINDOW_SERVICE);
if (wm == null) return -1;
Point point = new Point();
wm.getDefaultDisplay().getSize(point);
return point.y;
}
实例2：设置窗口全屏显示
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
getSupportActionBar().hide();运行结果：
实例3：保持屏幕常亮
/**
* @param activity
* @param keepScreenOn 是否开启屏幕常亮
*/
public void setKeepScreenOn(Activity activity, boolean keepScreenOn) {
if(keepScreenOn){
activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
}else{
activity.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
}
}实例4：简单悬浮框的实现 实现代码： 一个触摸图标工具类：EasyTouchView.class
package cn.xy.windowmanager;
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.PixelFormat;
import android.os.Build;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
public class EasyTouchView{
public static final String TAG = "EasyTouch";
private static EasyTouchView mEasyTouchView;
private Context mContext;
public static EasyTouchView getInstance() {
if (mEasyTouchView == null) {
mEasyTouchView = new EasyTouchView();
}
return mEasyTouchView;
}
private WindowManager mWindowManager;
private int width, height;
private double stateHeight;
private WindowManager.LayoutParams layoutParams;
private Button iconView;
private float startX = 0, startY = 0;
private float startRawX = 0, startRawY = 0;
private int iconViewX = 0, iconViewY = 0;
private boolean isIconView = false;
private DisplayMetrics mDisplayMetrics;
public void initEasyTouch(Context mContext, DisplayMetrics displayMetrics) {
this.mDisplayMetrics = displayMetrics;
this.mContext = mContext;
width = mDisplayMetrics.widthPixels;
height = mDisplayMetrics.heightPixels;
stateHeight = Math.ceil(25 * displayMetrics.density);
createWM();
}
private void createWM() {
mWindowManager = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
layoutParams = new WindowManager.LayoutParams();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
layoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
}else {
layoutParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;
}
layoutParams.format = PixelFormat.TRANSLUCENT;
layoutParams.flags = WindowManager.LayoutParams.FLAG_IGNORE_CHEEK_PRESSES | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
}
@SuppressLint("ClickableViewAccessibility")
public void addIconView() {
if (isIconView) {
return;
}
isIconView = true;
if (iconView == null) {
iconView = new Button(mContext);
iconView.setBackgroundResource(R.mipmap.ic_launcher);
iconView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
float rawX = event.getRawX();
float rawY = (float) (event.getRawY() - stateHeight);
int sumX = (int) (rawX - startRawX);
int sumY = (int) (event.getRawY() - startRawY);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
Log.i("Log", "Action_Down");
startX = event.getX();
startY = event.getY();
startRawX = event.getRawX();
startRawY = event.getRawY();
layoutParams.alpha = 1f;
mWindowManager.updateViewLayout(iconView, layoutParams);
break;
case MotionEvent.ACTION_UP:
/* layoutParams.alpha = 0.6f;
mWindowManager.updateViewLayout(iconView, layoutParams);
if (sumX > -10 && sumX < 10 && sumY > -10 && sumY < 10) {
removeIcon();
} else {
float endRawX = rawX - startX;
float endRawY = rawY - startY;
if (endRawX < width / 2) {
if (endRawX > endRawY) {
if (rawY > iconView.getHeight() * 2) {
updateIconViewPosition(endRawX, endRawY);
} else {
updateIconViewPosition(endRawX, 0);
}
} else if (endRawX > height - event.getRawY() - 98) {
if ((float) (height - stateHeight - endRawY - 98) > iconView.getHeight() * 2) {
updateIconViewPosition(endRawX, endRawY);
} else {
updateIconViewPosition(endRawX, (float) (height - stateHeight - 98));
}
} else {
if (endRawX > iconView.getWidth() * 2) {
updateIconViewPosition(endRawX, endRawY);
} else {
updateIconViewPosition(0, endRawY);
}
}
} else {
if (width - endRawX - 98 > endRawY) {
if (rawY > iconView.getHeight() * 2) {
updateIconViewPosition(endRawX, endRawY);
} else {
updateIconViewPosition(endRawX, 0);
}
} else if (width - endRawX - 98 > height - event.getRawY() - 98) {
if ((float) (height - stateHeight - endRawY - 98) > iconView.getHeight() * 2) {
updateIconViewPosition(endRawX, endRawY);
} else {
updateIconViewPosition(endRawX, (float) (height - stateHeight - 98));
}
} else {
if (width - endRawX - 98 > iconView.getWidth() * 2) {
updateIconViewPosition(endRawX, endRawY);
} else {
updateIconViewPosition(width, endRawY);
}
}
}
}
startX = 0;
startY = 0;
startRawX = 0;
startRawY = 0;*/
break;
case MotionEvent.ACTION_MOVE:
if (sumX < -10 || sumX > 10 || sumY < -10 || sumY > 10) {
updateIconViewPosition(rawX - startX, rawY - startY);
}
break;
default:
break;
}
return true;
}
});
}
layoutParams.alpha = 0.5f;
layoutParams.x = iconViewX;
layoutParams.y = iconViewY;
layoutParams.width = 170;
layoutParams.height = 170;
layoutParams.gravity = Gravity.LEFT | Gravity.TOP;
mWindowManager.addView(iconView, layoutParams);
}
private void updateIconViewPosition(float x, float y) {
iconViewX = (int) x;
iconViewY = (int) y;
layoutParams.x = (int) x;
layoutParams.y = (int) y;
mWindowManager.updateViewLayout(iconView, layoutParams);
}
public void removeIcon() {
if (isIconView && iconView != null) {
mWindowManager.removeView(iconView);
isIconView = false;
}
}
}开关控制
public void onClick(View view){
switch (view.getId()){
case R.id.open:
EasyTouchView.getInstance().addIconView();
break;
case R.id.close:
EasyTouchView.getInstance().removeIcon();
break;
}
}接着AndroidManifest.xml加上权限，以及为MainService进行注册：
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>运行效果图：
本文参与 腾讯云自媒体同步曝光计划，分享自微信公众号。
原始发表：2021-03-09，如有侵权请联系 cloudcommunity@tencent.com 删除
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