我已经开始了一个Android项目,并且需要创建一个始终位于所有应用程序顶部的小图像按钮。 我已经看到其他一些应用程序正在这样做,并且我希望它像那些一样。它应该在屏幕上是可移动的(例如,像YouTube或Telegram的视频叠加层),并且也应该是可破坏的。
我也想处理图片叠加层上的点击。
到目前为止,我还遵循了其他一些教程,并且授予了Settings.ACTION_MANAGE_OVERLAY_PERMISSION
权限。但是我不知道该怎么办。
任何帮助将不胜感激
答案 0 :(得分:0)
好的。这是完成工作的一段代码:(您可以将ImageView更改为其他任何东西,并将其用作覆盖。)
startPowerOverlay()
功能:
@SuppressLint("ClickableViewAccessibility")
private void startPowerOverlay(){
// Starts the button overlay.
windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
overlayPowerBtn = new ImageView(this);
overlayPowerBtn.setImageResource(R.drawable.REPLACE_ME);
int LAYOUT_FLAG;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
// APPLICATION_OVERLAY FOR ANDROID 26+ AS THE PREVIOUS VERSION RAISES ERRORS
LAYOUT_FLAG = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
} else {
// FOR PREVIOUS VERSIONS USE TYPE_PHONE AS THE NEW VERSION IS NOT SUPPORTED
LAYOUT_FLAG = WindowManager.LayoutParams.TYPE_PHONE;
}
WindowManager.LayoutParams params = new WindowManager.LayoutParams(
WindowManager.LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.WRAP_CONTENT,
LAYOUT_FLAG,
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
PixelFormat.TRANSLUCENT);
params.gravity = Gravity.TOP | Gravity.START;
params.x = 0;
params.y = 100;
params.height = 110;
params.width = 110;
windowManager.addView(overlayPowerBtn, params);
overlayPowerBtn.setOnTouchListener(new View.OnTouchListener() {
private int initialX;
private int initialY;
private float initialTouchX;
private float initialTouchY;
private long latestPressTime = 0;
@Override public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
// Save current x/y
initialX = params.x;
initialY = params.y;
initialTouchX = event.getRawX();
initialTouchY = event.getRawY();
// Check for double clicks.
if (latestPressTime == 0 || latestPressTime + 500 < System.currentTimeMillis()) {
latestPressTime = System.currentTimeMillis();
} else {
// Doubleclicked. Do any action you'd like
}
return true;
case MotionEvent.ACTION_UP:
return true;
case MotionEvent.ACTION_MOVE:
params.x = initialX + (int) (event.getRawX() - initialTouchX);
params.y = initialY + (int) (event.getRawY() - initialTouchY);
windowManager.updateViewLayout(overlayPowerBtn, params);
return true;
}
return false;
}
});
}
在onCreate()
上:
// Check for overlay permission. If not enabled, request for it. If enabled, show the overlay
if(Build.VERSION.SDK_INT >= 23 && !Settings.canDrawOverlays(context)){
CharSequence text = "Please grant the access to the application.";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
startActivity(new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION, Uri.fromParts("package", getPackageName(), null)));
} else {
startPowerOverlay();
}
在onDestroy()
上:
if (overlayPowerBtn != null)
windowManager.removeView(overlayPowerBtn);
希望有帮助。