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

}