Read More button in android

Ich kann Ihnen den genauen code u Wünsche, aber ich kann u helfen, indem Sie ein Beispiel-code, die Ihren Bedürfnissen entspricht,

Hier bin ich nur beschreiben, wie mehr/weniger-button-Funktionalität sind in Arbeit.
zunächst in Ihrer activity_main.xml Datei fügen Sie folgenden code.

<ScrollView 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" >

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/description_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:maxLines="5"
            android:text="@string/desc_content" />

        <ImageButton
            android:id="@+id/show"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_below="@+id/description_text"
            android:background="@drawable/arrow_down"
            android:clickable="true" />

        <View
            android:id="@+id/view1"
            android:layout_width="wrap_content"
            android:layout_height="2dp"
            android:layout_below="@+id/description_text"
            android:layout_marginTop="5dp"
            android:layout_toLeftOf="@+id/show"
            android:background="#000" />

        <ImageButton
            android:id="@+id/hide"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_below="@+id/description_text"
            android:background="@drawable/arrow_up"
            android:clickable="true"
            android:visibility="invisible" />
    </RelativeLayout>

</ScrollView>

MainActivity.java

package com.example.expand.textview;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.TextView;

public class MainActivity extends Activity {
 TextView descText;
 ImageButton show, hide;

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

  descText = (TextView) findViewById(R.id.description_text);
  show = (ImageButton) findViewById(R.id.show);
  show.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View v) {
    System.out.println("Show button");
    show.setVisibility(View.INVISIBLE);
    hide.setVisibility(View.VISIBLE);
    descText.setMaxLines(Integer.MAX_VALUE);

   }
  });
  hide = (ImageButton) findViewById(R.id.hide);
  hide.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View v) {
    System.out.println("Hide button");
    hide.setVisibility(View.INVISIBLE);
    show.setVisibility(View.VISIBLE);
    descText.setMaxLines(5);

   }
  });

 }

}

und schließlich ändern Sie Ihre string.xml Datei
string.xml

<resources>

    <string name="app_name">Expand TextView</string>
    <string name="hello_world">Hello world!</string>
    <string name="menu_settings">Settings</string>
    <string name="title_activity_main">MainActivity</string>
    <string name="desc_content">     Android powers hundreds of millions of mobile devices in more than 190 countries around the world. It\'s the largest installed base of any mobile platform and growing fast—every day another million users power up their Android devices for the first time and start looking for apps, games, and other digital content.

Android gives you a world-class platform for creating apps and games for Android users everywhere, as well as an open marketplace for distributing to them instantly.
</string>

</resources>

Ihr Projekt, und führen Sie Es wird geben Sie unten Ausgabe.