悬浮窗是在系统上显示的内容，好像微信视频聊天时的小窗口一样，在退出软件后依然存在的一个窗口，本博客以窗口中放一个button组件为例，简单展示悬浮窗，其中包括了对Android 6.0以下、Android 6.0到Android 8.0、Android 8.0以上版本的处理，下面开始介绍实现方法：
1、MainActivity中的代码
public Button mFloatingButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//初始化view
initView();
}
//初始化view
private void initView() {
mFloatingButton=(Button) findViewById(R.id.floating_btn);
mFloatingButton.setOnClickListener(this);
}
public void startFloatingButtonService(View view) {
Log.e("测试流程", "测试流程");
if (FloatingService_Button.isStarted) {
Log.e("测试流程2", "测试流程2");
return;
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {//判断系统版本
if (!Settings.canDrawOverlays(this)) {
Toast.makeText(this, "当前无权限，请授权", Toast.LENGTH_SHORT);
Log.e("测试流程3", "测试流程3");
startActivityForResult(new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION, Uri.parse("package:" + getPackageName())), 0);
} else {
Log.e("测试流程4", "测试流程4");
startService(new Intent(MainActivity.this, FloatingService_Button.class));
}
} else {
startService(new Intent(MainActivity.this, FloatingService_Button.class));
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 0) {
if (!Settings.canDrawOverlays(this)) {
Log.e("测试流程5", "测试流程5");
Toast.makeText(this, "授权失败", Toast.LENGTH_SHORT).show();
} else {
Log.e("测试流程6", "测试流程6");
Toast.makeText(this, "授权成功", Toast.LENGTH_SHORT).show();
startService(new Intent(MainActivity.this, FloatingService_Button.class));
}
}
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.floating_btn :
startFloatingButtonService(v);
break;
}
}
思路简单解释：点击弹出悬浮窗按钮时，获取版本并判断“Build.VERSION.SDK_INT >= Build.VERSION_CODES.M”如果系统版本在6.0以下这不需要请求权限，如果系统版本在6.0以上需要进行权限检测以及请求，获取权限后，弹出悬浮框
2、activity_main.xml代码
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context="com.example.jack_lin.suspendwindow.MainActivity"> <Button android:id="@+id/floating_btn" style="@style/floatingBtn" android:text="@string/floating_btn" /> </LinearLayout>
简单解释：xml中没什么特别东西，线性布局中放一个按钮
3、FloatingService_Button的代码
public static boolean isStarted = false;
private WindowManager windowManager;
private WindowManager.LayoutParams layoutParams;
private Button button;
@Override
public void onCreate() {
super.onCreate();
Log.e("进入服务1", "进入服务1");
isStarted = true;
windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
layoutParams = new WindowManager.LayoutParams();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
layoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
} else {
layoutParams.type = WindowManager.LayoutParams.TYPE_PHONE;
}
layoutParams.format = PixelFormat.RGBA_8888;
layoutParams.gravity = Gravity.LEFT | Gravity.TOP;
layoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
layoutParams.width = 500;
layoutParams.height = 100;
layoutParams.x = 300;
layoutParams.y = 300;
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
Log.e("进入服务2", "进入服务2");
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.e("进入服务3", "进入服务3");
showFloatingWindow();
return super.onStartCommand(intent, flags, startId);
}
private void showFloatingWindow() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {//判断系统版本
if (Settings.canDrawOverlays(this)) {
button = new Button(getApplicationContext());
button.setText("我是个button窗口");
button.setBackgroundColor(Color.BLUE);
windowManager.addView(button, layoutParams);
button.setOnTouchListener(new FloatingOnTouchListener());
}
} else {
button = new Button(getApplicationContext());
button.setText("我是个button窗口");
button.setBackgroundColor(Color.BLUE);
windowManager.addView(button, layoutParams);
button.setOnTouchListener(new FloatingOnTouchListener());
}
}
private class FloatingOnTouchListener implements View.OnTouchListener {
private int x;
private int y;
@Override
public boolean onTouch(View view, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
x = (int) event.getRawX();
y = (int) event.getRawY();
break;
case MotionEvent.ACTION_MOVE:
int nowX = (int) event.getRawX();
int nowY = (int) event.getRawY();
int movedX = nowX - x;
int movedY = nowY - y;
x = nowX;
y = nowY;
layoutParams.x = layoutParams.x + movedX;
layoutParams.y = layoutParams.y + movedY;
windowManager.updateViewLayout(view, layoutParams);
break;
default:
break;
}
return false;
}
}
思路简单解释：首先获取WindowManager服务，然后定义并设置在window上显示的layoutParams（此处需注意Android 8.0以上版本中LayoutParam里的type变量变为TYPE_APPLICATION_OVERLAY与Android 8.0以下版本LayoutParam里的type变量TYPE_PHONE不一样，需要通过判断系统版本进行区分），然后定义并设置在layoutParams上面显示的Button按钮以及监听事件（此处的监听事件主要是悬浮窗口拖动的监听）最后将设置好的button与layoutParams添加入window中
4、AndroidManifest.xml中权限添加
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" /> <uses-permission android:name="android.permission.INTERNET" />
5、效果图
源码下载地址：Android悬浮窗 源码下载
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
