Android自定义可跟随手指拖动的全局悬浮窗_anddroid 悬浮手指

一丶首先是自定义一个跟随手指滑动的View，目前只支持简单的悬浮拖动，可在此基础上进行功能扩展，比如直播类APP的悬浮播放窗也是这个原理，挺简单的，不多说了，直接上代码，

 
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.provider.Settings;
import android.support.v7.widget.AppCompatImageView;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.WindowManager;
import android.widget.Toast;
 
/**
 * Created by vaiyee on 2019/12/28 0028.
 */
 
public class FloatWindowImageView extends AppCompatImageView implements View.OnTouchListener {
    private WindowManager windowManager;
    private WindowManager.LayoutParams layoutParams;
    private Boolean isMove = false;
    private float lastX;
 
    public FloatWindowImageView(WindowManager windowManager,WindowManager.LayoutParams layoutParams,Context context) {
        super(context);
        this.windowManager = windowManager;
        this.layoutParams = layoutParams;
        setOnTouchListener(this);
        setOnClickListener(v -> Toast.makeText(context,"点击了",Toast.LENGTH_LONG).show());
        requestSettingCanDrawOverlays();
    }
 
    public FloatWindowImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
 
    public FloatWindowImageView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }
 
 
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        float x = event.getRawX();
        switch (event.getAction()){
            case MotionEvent.ACTION_DOWN:
                isMove = false;
                break;
            case MotionEvent.ACTION_MOVE:
                if (Math.abs(x - lastX) > ViewConfiguration.get(getContext()).getScaledTouchSlop()){
                    isMove = true;
                    layoutParams.x = (int) (event.getRawX() - getWidth() / 2);
                    layoutParams.y = (int) (event.getRawY() - getHeight() / 2);
                    windowManager.updateViewLayout(this,layoutParams);
                }
                return true;
                case MotionEvent.ACTION_UP:
                    if (isMove){
                        return true;
                    }
        }
        lastX = x;
        return super.onTouchEvent(event);
    }
 
// 申请悬浮权限
    private void requestSettingCanDrawOverlays() {
        try {
            //判断当前系统版本
            if (Build.VERSION.SDK_INT >= 23) {
                //判断权限是否已经申请过了（加上这个判断，则使用的悬浮窗的时候；如果权限已经申请则不再跳转到权限开启界面）
                if (!Settings.canDrawOverlays(getContext())) {
                    //申请权限
                    Intent intent2 = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION);
                    ((Activity)getContext()).startActivityForResult(intent2, 1001);
                } else {
                    //创建悬浮窗
                    windowManager.addView(this, layoutParams);
                }
            } else {
                windowManager.addView(this, layoutParams);
            }
            System.out.println("Build.VERSION.SDK_INT::::" + Build.VERSION.SDK_INT);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
 
// 申请完权限后显示出来
    public void showFloatWindow(){
        windowManager.addView(this, layoutParams);
    }
}

二丶然后就是在activity中使用了：

              WindowManager windowManager = (WindowManager) getApplicationContext().getSystemService(Context.WINDOW_SERVICE);
                WindowManager.LayoutParams layoutParams = new WindowManager.LayoutParams();
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {//8.0
                    layoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
                } else {
                    layoutParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;
                }
                layoutParams.format = PixelFormat.TRANSLUCENT;
                layoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
                layoutParams.x = 0;
                layoutParams.y = 0;
                layoutParams.gravity = Gravity.START | Gravity.TOP;
                layoutParams.width = 200;
                layoutParams.height = 200;
                imageView = new FloatWindowImageView(windowManager,layoutParams,this);
                imageView.setImageResource(R.drawable.weixin);