可收缩的TextView

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin" >

    <!-- android 简单的两步实现Play上的文本伸缩功能 -->
    <!-- http://www.cnblogs.com/TerryBlog/archive/2013/03/12/2956165.html -->
    <FrameLayout
        android:id="@+id/expandable_container"
        android:layout_width="wrap_content"
        android:layout_height="50dp"
        android:layout_marginBottom="@dimen/linear_margin_bigger" >

        <TextView
            android:id="@+id/expandable_text"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:clickable="true"
            android:ellipsize="end"
            android:text="@string/loremipsum" />
    </FrameLayout>

    <!-- my method -->
    <FrameLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/myexpandable_text"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:maxLines="3"
            android:clickable="true"
            android:ellipsize="end"
            android:text="@string/loremipsum" />
    </FrameLayout>

</LinearLayout>

package com.lxh.textview;

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

import com.example.com.lxh.pro1.R;

/**
 * android 简单的两步实现Play上的文本伸缩功能
 * http://www.cnblogs.com/TerryBlog/archive/2013/03/12/2956165.html
 * @author lxh
 */
public class ExpandableTV extends Activity {
    // -------------------------- Terry's method --------------------------
    private boolean isExpanded = false, myIsExpanded = false;
    private int lastHeight = 0;
    private ViewGroup expandableContainer;
    private TextView textView, myTextView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_expandable_tv);
        expandableContainer = (ViewGroup) findViewById(R.id.expandable_container);
        textView = (TextView) findViewById(R.id.expandable_text);
        textView.setOnClickListener(terryClickListener);
        myTextView = (TextView) findViewById(R.id.myexpandable_text);
        myTextView.setOnClickListener(myClickListener);
    }
    
    private OnClickListener terryClickListener = new OnClickListener() {
        @Override
        public void onClick(View v) {
            if (isExpanded) {
                LayoutParams params = (LayoutParams) expandableContainer.getLayoutParams();
                params.height = lastHeight;
                expandableContainer.setLayoutParams(params);
                expandableContainer.invalidate(); //调用OnDraw方法
            } else {
                lastHeight = expandableContainer.getHeight();
                LayoutParams params = (LayoutParams) expandableContainer.getLayoutParams();
                params.height = ViewGroup.LayoutParams.WRAP_CONTENT;
                expandableContainer.setLayoutParams(params);
                expandableContainer.invalidate(); //调用OnDraw方法
            }
            isExpanded = !isExpanded;
        }
    };
    //Terry总结：此方法缺陷，当给出最大高度不合适时，字会显示一半高度

    // -------------------------- my method --------------------------
    private OnClickListener myClickListener = new OnClickListener() {
        @Override
        public void onClick(View v) {
            if (myIsExpanded) {
                myTextView.setMaxLines(3);
                expandableContainer.invalidate(); //调用OnDraw方法
            } else {
                myTextView.setMaxLines(Integer.MAX_VALUE);
                expandableContainer.invalidate(); //调用OnDraw方法
            }
            myIsExpanded = !myIsExpanded;
        }
    };
    //Me总结：此方法不存在Terry的问题
}