Android-使用从左向右滑动来显示/隐藏TextView [英] Android - Show/Hide TextView using Swipe Left to Right
本文介绍了Android-使用从左向右滑动来显示/隐藏TextView的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在尝试显示/隐藏TextView.因此,如果用户从左向右滑动,它将在橙色渐变视图"后面显示TextView.并在显示文字后5秒钟后将其再次隐藏,如下图所示:
I'm trying to show/hide TextView. So if the user swipe left-to-right, it will show TextView from behind the "orange gradient view". And after the text shown, after 5 seconds, it will hiding it again like the picture below:
但是我不知道要像上面那样实现最佳实践.请帮忙.
But i don't have any idea what the best practice to implement just like above. Please help.
推荐答案
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>
现在使用此类
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
In your MainActivity.java class use below code
//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
}
});
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