Android 任何位置的可移动悬浮窗

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刚好要做这块的东西，所以网上翻了下资料，百度出来的基本上都是：默认起始位置左上角，还不能改动，一改动起始位置，第二次拖动就不正常了~~

下面直接附上任意位置可拖动的源码（由于是demo写的比较乱）：

package com.example.dengshaomin.repluginhost;import android.content.Context;
import android.graphics.PixelFormat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.Toast;public class MainActivity extends AppCompatActivity {
private WindowManager wm = null;
private WindowManager.LayoutParams wmParams = null;
private ImageView leftbtn = null;
private int statusBarHeight1; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
int resourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
if (resourceId > 0) {
//根据资源ID获取响应的尺寸值
statusBarHeight1 = getResources().getDimensionPixelSize(resourceId);
}
setContentView(R.layout.activity_main);
initFloatView();
} public void textClick(View view) {
Toast.makeText(MainActivity.this, view.getId() + "", Toast.LENGTH_SHORT).show();
} private void initFloatView() {
//应用内悬浮窗，ondestory时记得销毁悬浮窗
/*
wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
// //设置LayoutParams(全局变量）相关参数
wmParams = new WindowManager.LayoutParams(
WindowManager.LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.TYPE_APPLICATION,
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL,
PixelFormat.TRANSLUCENT);
*/
///全局悬浮按钮，会显示在其他应用和桌面上
//获取WindowManager
wm = (WindowManager) getApplicationContext().getSystemService(Context.WINDOW_SERVICE);
//设置LayoutParams(全局变量）相关参数
wmParams = new WindowManager.LayoutParams(
WindowManager.LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.TYPE_TOAST,
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL,
PixelFormat.TRANSLUCENT);
wmParams.gravity = Gravity.LEFT | Gravity.CENTER_VERTICAL;
//以屏幕左上角为原点，设置x、y初始值
wmParams.x = 0;
wmParams.y = 0;
//设置悬浮窗口长宽数据
wmParams.width = 200;
wmParams.height = 200;
createLeftFloatView();
leftbtn.invalidate();
} private void createLeftFloatView() {
leftbtn = new ImageView(this);
leftbtn.setImageResource(R.mipmap.ic_launcher);
leftbtn.setAlpha(100);
leftbtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//Toast.makeText(MainActivity.this,"click",Toast.LENGTH_SHORT).show();
}
});
//调整悬浮窗口
//显示myFloatView图像
wm.addView(leftbtn, wmParams);
leftbtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "float", Toast.LENGTH_SHORT).show();
}
});
leftbtn.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
if (wm != null) {
wm.removeViewImmediate(leftbtn);
}
// Toast.makeText(MainActivity.this, "finish", Toast.LENGTH_SHORT).show();
return true;
}
});
leftbtn.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) { // 当前值以屏幕左上角为原点
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mStartX = event.getRawX();
mStartY = event.getRawY();
break; case MotionEvent.ACTION_MOVE:
wmParams.x += event.getRawX() - mStartX;
wmParams.y += event.getRawY() - mStartY;
wm.updateViewLayout(leftbtn, wmParams);
mStartX = event.getRawX();
mStartY = event.getRawY();
break;
case MotionEvent.ACTION_UP:
break;
} // 消耗触摸事件
return true; }
});
} private float mStartX, mStartY;
}