Android滚动查看扩大和缩小

Question

如何在滚动视图的下方添加向下箭头按钮，以便在按下滚动视图时将其展开为height.on，然后再按下它缩小到原始高度。我只想要在ScrollView中显示一个小内容，按下按钮显示更多内容。

我该如何做到这一点？请帮忙。 感谢advnc

这里是我的滚动视图

 <ScrollView 
     android:id="@+id/scrollView1" 
     android:layout_width="match_parent" 
     android:layout_marginBottom="@dimen/_5sdp" 
     android:layout_height="@dimen/_120sdp" 
     > 

     <TableLayout 
      xmlns:tools="http://schemas.android.com/tools" 
      android:id="@+id/tl" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      tools:context=".customer.database.OrderNew_Activity" 
      android:layout_weight="2" 
      > 



     </TableLayout> 

    </ScrollView> 

我想在按下按钮

Answer 1

下面添加滚动视图按钮显示tablelayout和显示器的休息小部分。

在您的活动中添加全局布尔变量来检查scrollview是否展开。

boolean exapanded = false; 

在按钮的onclick听众做以下

if(expanded){ 
scrollView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,100)); 
expanded = false; 
} 
else{ 
scrollView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT)); 
expanded = true; 
} 

Answer 2

在这里，我试图解决您的问题。

你只需要以下内容添加到您的的build.gradle文件：

compile 'com.ms-square:expandableTextView:0.1.4' 

activity_main.xml中

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    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.expandabletextview.MainActivity"> 

    <ScrollView 
     android:layout_width="match_parent" 
     android:layout_height="match_parent"> 

     <com.ms.square.android.expandabletextview.ExpandableTextView 
      xmlns:android="http://schemas.android.com/apk/res/android" 
      xmlns:expandableTextView="http://schemas.android.com/apk/res-auto" 
      android:id="@+id/expand_text_view" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      expandableTextView:animDuration="500" 
      expandableTextView:maxCollapsedLines="4"> 

      <TextView 
       android:id="@id/expandable_text" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:layout_marginLeft="10dp" 
       android:layout_marginRight="10dp" 
       android:textColor="#666666" 
       android:textSize="16dp" /> 

      <ImageButton 
       android:id="@id/expand_collapse" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_gravity="right|bottom" 
       android:background="@android:color/transparent" 
       android:padding="16dp" /> 
     </com.ms.square.android.expandabletextview.ExpandableTextView> 
    </ScrollView> 
</RelativeLayout> 

MainActivity.java

public class MainActivity extends AppCompatActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     // sample code snippet to set the text content on the ExpandableTextView 
     ExpandableTextView expTv1 = (ExpandableTextView) findViewById(R.id.expand_text_view); 

     // IMPORTANT - call setText on the ExpandableTextView to set the text content to display 
     expTv1.setText(getString(R.string.dummy_text1)); 
    } 
} 

string.xml

<resources> 
    <string name="dummy_text1">Hellooooooooooooooo This is dummy text. Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry\'s standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</string> 
</resources>