触摸移动的悬浮窗的快速实现

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”

    <uses-sdk
        android:minSdkVersion="17"
        android:targetSdkVersion="17" />

    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

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;

        }
    }
}