Android Custom APP Global Floating Button
- 2021-08-12 03:29:11
- OfStack
Originally, I wanted to realize a button suspended on other controls through framelayout, but I felt very troublesome and needed to dynamically fill every interface. So I thought of the floating window and customized an ImageView for displaying global buttons.
1. First of all, you need to add permissions because of the floating window. For SDK
>
= 23 needs to get permission dynamically, but I use 22 here
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
<uses-permission android:name="android.permission.WRITE_SETTINGS"/>
2. Acquiring params data of global WindowManager through application
private WindowManager.LayoutParams wmParams=new WindowManager.LayoutParams();
public WindowManager.LayoutParams getMywmParams(){
return wmParams;
}
3. Custom ImageView, and realize click with state selection. One callback interface is written to deal with click events
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);
}
/**
* Height of status bar
*
*/
public static int getStatusHeight(Context context) {
int statusHeight = -1;
try {
Class clazz = Class.forName("com.android.internal.R$dimen"); // Getting instances using reflection
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) {
// Gets the coordinates relative to the screen, that is, starting from the upper left corner of the screen
x = event.getRawX();
y = event.getRawY() - statusHeight; //statusHeight Is the height of the system status bar
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: // Press
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: // Finger movement
updateViewPosition();
isMove = true;
break;
case MotionEvent.ACTION_UP: // Hands up
setImageResource(R.drawable.btn_voice_rest);
mLastX = event.getRawX();
mLastY = event.getRawY();
mUpTime = System.currentTimeMillis();
// The time from pressing to lifting is greater than 500 Milliseconds , And the absolute value from raising your hand to raising your hand is greater than 20 Pixel processing click events
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); // Refresh display
}
/**
* Setting the click callback interface
*/
public interface OnSpeakListener{
void onSpeakListener();
}
public void setOnSpeakListener(OnSpeakListener listener){
this.listener=listener;
}
}
4. Used in Activity, which has parameters for setting pictures and position parameters
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;// Set the background picture
wmParams.flags= WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE ;//
wmParams.gravity = Gravity.LEFT|Gravity.TOP;//
wmParams.x = widthPixels-150; // Set position pixels
wmParams.y = heightPixels-110;
wmParams.width=200; // Set the picture size
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, " Click event ", Toast.LENGTH_SHORT).show();
}
});
}
@Override
protected void onDestroy() {
super.onDestroy();
if(CustomeMovebutton != null){
wm.removeView(CustomeMovebutton);
}
}
}