时间：2020-12-16 09:50:10 | 栏目：Android代码 | 点击：次
原本想通过framelayout实现一个悬浮在其他控件上的按钮,但是觉得很麻烦,需要各个界面都要动态填充.于是想到了悬浮窗,就自定一个ImageView用于显示全局按钮.
一、首先因为悬浮窗式的所以要添加权限,对于SDK>=23的需要动态获取权限,我这边用的是22的
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" /> <uses-permission android:name="android.permission.WRITE_SETTINGS"/>
二、通过application获取到全局性的WindowManager的params数据
private WindowManager.LayoutParams wmParams=new WindowManager.LayoutParams();
public WindowManager.LayoutParams getMywmParams(){
return wmParams;
}
三、自定义ImageView,并实现点击具有状态选择.其中写了一个回调接口用于对点击事件的处理
public class CustomeMovebutton extends ImageView {
private final int statusHeight;
int sW;
int sH;
private float mTouchStartX;
private float mTouchStartY;
private float x;
private float y;
private boolean isMove=false;
private Context context;
private WindowManager wm = (WindowManager) getContext().getApplicationContext().getSystemService(Context.WINDOW_SERVICE);
private WindowManager.LayoutParams wmParams = ((MyApplication) getContext().getApplicationContext()).getMywmParams();
private float mLastX;
private float mLastY;
private float mStartX;
private float mStartY;
private long mDownTime;
private long mUpTime;
private OnSpeakListener listener;
public CustomeMovebutton(Context context) {
this(context,null);
this.context = context;
}
public CustomeMovebutton(Context context, AttributeSet attrs) {
this(context, attrs,-1);
}
public CustomeMovebutton(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs,defStyleAttr);
sW = wm.getDefaultDisplay().getWidth();
sH = wm.getDefaultDisplay().getHeight();
statusHeight = getStatusHeight(context);
}
/**
* 状态栏的高度
*
*/
public static int getStatusHeight(Context context) {
int statusHeight = -1;
try {
Class clazz = Class.forName("com.android.internal.R$dimen"); //使用反射获取实例
Object object = clazz.newInstance();
int height = Integer.parseInt(clazz.getField("status_bar_height")
.get(object).toString());
statusHeight = context.getResources().getDimensionPixelSize(height);
} catch (Exception e) {
e.printStackTrace();
}
return statusHeight;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
//获取相对屏幕的坐标，即以屏幕左上角为原点
x = event.getRawX();
y = event.getRawY() - statusHeight; //statusHeight是系统状态栏的高度
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: //按下
setImageResource(R.drawable.btn_voice_pressed);
mTouchStartX = event.getX();
mTouchStartY = event.getY();
mStartX = event.getRawX();
mStartY = event.getRawY();
mDownTime = System.currentTimeMillis();
isMove = false;
break;
case MotionEvent.ACTION_MOVE: //手指移动
updateViewPosition();
isMove = true;
break;
case MotionEvent.ACTION_UP: //手抬起
setImageResource(R.drawable.btn_voice_rest);
mLastX = event.getRawX();
mLastY = event.getRawY();
mUpTime = System.currentTimeMillis();
//按下到抬起的时间大于500毫秒,并且抬手到抬手绝对值大于20像素处理点击事件
if(mUpTime - mDownTime < 500){
if(Math.abs(mStartX- mLastX )< 20.0 && Math.abs(mStartY - mLastY) < 20.0){
if (listener!=null){
listener.onSpeakListener();
}
}
}
break;
}
return true;
}
private void updateViewPosition() {
wmParams.x = (int) (x - mTouchStartX);
wmParams.y = (int) (y- mTouchStartY);
wm.updateViewLayout(this, wmParams); //刷新显示
}
/**
* 设置点击回调接口
*/
public interface OnSpeakListener{
void onSpeakListener();
}
public void setOnSpeakListener(OnSpeakListener listener){
this.listener=listener;
}
}
四、Activity中使用,其中有设置图片的参数和位置参数
public class MainActivity extends AppCompatActivity{
private WindowManager wm;
private WindowManager.LayoutParams wmParams;
private CustomeMovebutton CustomeMovebutton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
wm = (WindowManager) getApplicationContext().getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics dm = getResources().getDisplayMetrics();
int widthPixels = dm.widthPixels;
int heightPixels = dm.heightPixels;
wmParams = ((MyApplication) getApplication()).getMywmParams();
wmParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;
wmParams.format= PixelFormat.RGBA_8888;//设置背景图片
wmParams.flags= WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE ;//
wmParams.gravity = Gravity.LEFT|Gravity.TOP;//
wmParams.x = widthPixels-150; //设置位置像素
wmParams.y = heightPixels-110;
wmParams.width=200; //设置图片大小
wmParams.height=200;
CustomeMovebutton = new CustomeMovebutton(getApplicationContext());
CustomeMovebutton.setImageResource(R.drawable.btn_voice_rest);
wm.addView(CustomeMovebutton, wmParams);
CustomeMovebutton.setOnSpeakListener(new CustomeMovebutton.OnSpeakListener() {
@Override
public void onSpeakListener() {
Toast.makeText(MainActivity.this, "点击事件", Toast.LENGTH_SHORT).show();
}
});
}
@Override
protected void onDestroy() {
super.onDestroy();
if(CustomeMovebutton != null){
wm.removeView(CustomeMovebutton);
}
}
}