我正在尝试显示/隐藏 TextView。因此,如果用户从左向右滑动,它将显示“橙色渐变 View ”后面的 TextView。并且在显示文字后,5 秒后,它会再次隐藏它,如下图所示:
但我不知道像上面那样实现的最佳实践是什么。 请帮忙。
最佳答案
这是xml文件
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/activity_theme_sel_ll_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<!--Add your content here for texview and whatever -->
</LinearLayout>
现在使用这个类
import android.content.Context;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
/**
* This TouchListener is Using for very First time ThemeSelection Screen with SwipeLeft Finger
*/
public class OnSwipeTouchListener implements OnTouchListener {
private final GestureDetector gestureDetector;
public OnSwipeTouchListener(Context ctx) {
gestureDetector = new GestureDetector(ctx, new GestureListener());
}
@Override
public boolean onTouch(View v, MotionEvent event) {
return gestureDetector.onTouchEvent(event);
}
private final class GestureListener extends SimpleOnGestureListener {
private static final int SWIPE_THRESHOLD = 1;
private static final int SWIPE_VELOCITY_THRESHOLD = 1;
@Override
public boolean onDown(MotionEvent e) {
return true;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
boolean result = false;
try {
float diffY = e2.getY() - e1.getY();
float diffX = e2.getX() - e1.getX();
if (Math.abs(diffX) > Math.abs(diffY)) {
if (Math.abs(diffX) > SWIPE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
if (diffX > 0) {
onSwipeRight();
} else {
onSwipeLeft();
}
}
result = true;
} else if (Math.abs(diffY) > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD) {
if (diffY > 0) {
onSwipeBottom();
} else {
onSwipeTop();
}
}
result = true;
} catch (Exception exception) {
exception.printStackTrace();
}
return result;
}
}
public void onSwipeRight() {
}
public void onSwipeLeft() {
}
public void onSwipeTop() {
}
public void onSwipeBottom() {
}
}
在您的 MainActivity.java 类中使用以下代码
//llMain is the root layout of your xml where you want to perform swipe
llMain.setOnTouchListener(new OnSwipeTouchListener(ThemeSelectionActivity.this) {
@Override
public void onSwipeLeft() {
super.onSwipeLeft();
}
}
@Override
public void onSwipeRight() {
super.onSwipeRight();
// Put your logic here for text visibility and for timer like progress bar for 5 second and setText
}
});
关于Android - 使用从左向右滑动来显示/隐藏 TextView,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41634823/