在我的活动中是一个不可见的动作按钮。现在我想在点击或滑动时显示他。
我的XML文件:
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical"
android:visibility="visible">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
tools:ignore="ScrollViewSize">
<RelativeLayout
android:id="@+id/activity_a1"
android:layout_width="match_parent"
android:layout_height="625dp"
android:background="@color/background"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.thebest.charakterisierung.a1"
tools:ignore="UselessParent">
<android.support.design.widget.FloatingActionButton
android:id="@+id/floatingActionButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:clickable="true"
android:visibility="inviible"
app:backgroundTint="@android:color/holo_green_dark"
app:fabSize="mini"
app:srcCompat="@android:drawable/ic_menu_save" />
</RelativeLayout>
</LinearLayout>
我的java文件:
package com.test.test;
import android.content.SharedPreferences;
import android.support.v4.view.GestureDetectorCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.view.MotionEvent;
public class Geschichte1 extends AppCompatActivity implements GestureDetector.OnGestureListener, GestureDetector.OnDoubleTapListener {
private GestureDetectorCompat GestureDetect;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(android.view.Window.FEATURE_NO_TITLE);
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
this.setContentView(R.layout.activity_a1);
Button btn =(Button)findViewById(R.id.floatingActionButton);
GestureDetect = new GestureDetectorCompat(this, this);
GestureDetect.setOnDoubleTapListener(this);
}
@Override
public boolean onSingleTapConfirmed(MotionEvent e) {
return false;
}
@Override
public boolean onDoubleTap(MotionEvent e) {
return false;
}
@Override
public boolean onDoubleTapEvent(MotionEvent e) {
return false;
}
@Override
public boolean onDown(MotionEvent e) {
return false;
}
@Override
public void onShowPress(MotionEvent e) {
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
return false;
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
return false;
}
@Override
public void onLongPress(MotionEvent e) {
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
return false;
}
}
也许我可以添加java文件:Button.setVisibility或Button.Visible?没什么我尝试过的工作。
答案 0 :(得分:0)
在xml文件更新行中 机器人:能见度= “inviible”
要 机器人:能见度= “看不见的”
在java文件中,点击或滑动时使按钮可见
使btn变量类变量可以在onDoubleTap或onSingleTapConfirmed中访问 按钮btn;
将按钮的可见性设置为可见使用: btn.setVisibility(View.VISIBLE);