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1.触摸移动的悬浮窗的快速实现 UI

2. 悬浮窗实现

2.1 悬浮窗权限

为了偷懒，我SDK选择比较低的17，如果不配置权限，则应用会运行报错

正规流程，查询是否有悬浮窗权限，如果没有需要提示，并跳转到悬浮窗设置界面“即是否允许运行在其他应用上面”

2.2 悬浮窗配置初始化

这里主要关注 mParams.type 和 mParams.flags 这两个参数是核心，我们也可以使用View来加载一个布局，为了侧重悬浮窗界面，我直接使用TextView演示

private void initFloatWindow() {        if (mShow == null) {            mWm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);            mShow = new TextView(this);            mShow.setText("I Love You");            mShow.setTextColor(Color.RED);            mShow.setTextSize(50);            mShow.setOnTouchListener(new View.OnTouchListener() {                int lastX = 0;                int lastY = 0;                int paramX = 0;                int paramY = 0;                @Override                public boolean onTouch(View view, MotionEvent motionEvent) {                    switch (motionEvent.getAction()) {                    case MotionEvent.ACTION_DOWN:                        lastX = (int) motionEvent.getRawX();                        lastY = (int) motionEvent.getRawY();                        paramX = mParams.x;                        paramY = mParams.y;                        break;                    case MotionEvent.ACTION_MOVE:                        int dx = (int) motionEvent.getRawX() - lastX;                        int dy = (int) motionEvent.getRawY() - lastY;                        mParams.x = paramX + dx;                        mParams.y = paramY + dy;                        mWm.updateViewLayout(mShow, mParams);                        break;                    }                    return true;                }            });            mParams = new WindowManager.LayoutParams();            mParams.width = WindowManager.LayoutParams.WRAP_CONTENT;            mParams.height = WindowManager.LayoutParams.WRAP_CONTENT;            mParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;            // 实现悬浮窗可以移动的属性            mParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;            mParams.format = PixelFormat.TRANSPARENT;        }    }

2.3 悬浮窗显示

mWm.addView(mShow, mParams);

2.4 悬浮窗隐藏

mWm.removeView(mShow);

2.5 完整示例代码

package com.wu.sufadi;import android.app.Activity;import android.content.Context;import android.graphics.Color;import android.graphics.PixelFormat;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.LayoutInflater;import android.view.MotionEvent;import android.view.View;import android.view.WindowManager;import android.widget.TextView;public class MainActivity extends Activity {
       private TextView mShow;    private WindowManager mWm;    private WindowManager.LayoutParams mParams;    private static final int MSG_SHOW_WINDOW = 1;    private static final int MSG_HIDE_WINDOW = 2;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initFloatWindow();    }    public void click_show(View view) {        showFloatWindow();    }    public void click_hide(View view) {        hideFloatWindow();    }    Handler handler = new Handler() {        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            switch (msg.what) {            case MSG_SHOW_WINDOW:                mWm.addView(mShow, mParams);                break;            case MSG_HIDE_WINDOW:                mWm.removeView(mShow);                break;            default:                break;            }        }    };    private void showFloatWindow() {        handler.sendEmptyMessage(MSG_SHOW_WINDOW);    }    private void hideFloatWindow() {        handler.sendEmptyMessage(MSG_HIDE_WINDOW);    }    private void initFloatWindow() {        if (mShow == null) {            mWm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);            mShow = new TextView(this);            mShow.setText("I Love You");            mShow.setTextColor(Color.RED);            mShow.setTextSize(50);            mShow.setOnTouchListener(new View.OnTouchListener() {                int lastX = 0;                int lastY = 0;                int paramX = 0;                int paramY = 0;                @Override                public boolean onTouch(View view, MotionEvent motionEvent) {                    switch (motionEvent.getAction()) {                    case MotionEvent.ACTION_DOWN:                        lastX = (int) motionEvent.getRawX();                        lastY = (int) motionEvent.getRawY();                        paramX = mParams.x;                        paramY = mParams.y;                        break;                    case MotionEvent.ACTION_MOVE:                        int dx = (int) motionEvent.getRawX() - lastX;                        int dy = (int) motionEvent.getRawY() - lastY;                        mParams.x = paramX + dx;                        mParams.y = paramY + dy;                        mWm.updateViewLayout(mShow, mParams);                        break;                    }                    return true;                }            });            mParams = new WindowManager.LayoutParams();            mParams.width = WindowManager.LayoutParams.WRAP_CONTENT;            mParams.height = WindowManager.LayoutParams.WRAP_CONTENT;            mParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;            // 实现悬浮窗可以移动的属性            mParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;            mParams.format = PixelFormat.TRANSPARENT;        }    }}