android-点击文字收缩效果

来源：互联网发布：淘宝怎么重新激活店铺编辑：程序博客网时间：2024/05/16 08:41

项目中我们要求：当文字过长时，为了使得不让文字占据整个屏幕，也具有界面的客观性，我们会判断当文字过长时，只显示两行，末尾使用“。。。”和下拉图片来表示。

效果如下：

实现起来其实比较简单，代码一看便知，现在来看下代码：

activity_main.xml：

<LinearLayout 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:orientation="horizontal"    tools:context=".TextViewActivity" >    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:clickable="true"        android:text="撒的浪费空间阿萨德了房间爱上来看的房间阿里肯定是放假了凯撒的减肥了卡的减肥了凯撒的法律将撒的路口附近了" /></LinearLayout>

MyTouch.java：

package com.example.scrolltextview2;import android.graphics.Color;import android.text.Layout;import android.text.Selection;import android.text.Spannable;import android.text.Spanned;import android.text.method.LinkMovementMethod;import android.text.method.Touch;import android.text.style.BackgroundColorSpan;import android.text.style.ClickableSpan;import android.view.MotionEvent;import android.widget.TextView;public class MyTouch extends LinkMovementMethod {public boolean onTouchEvent(TextView widget, Spannable buffer,MotionEvent event) {// TODO Auto-generated method stubint action = event.getAction();if (action == MotionEvent.ACTION_UP|| action == MotionEvent.ACTION_DOWN) {int x = (int) event.getX();int y = (int) event.getY();x -= widget.getTotalPaddingLeft();y -= widget.getTotalPaddingTop();x += widget.getScrollX();y += widget.getScrollY();Layout layout = widget.getLayout();int line = layout.getLineForVertical(y);int off = layout.getOffsetForHorizontal(line, x);ClickableSpan[] link = buffer.getSpans(off, off,ClickableSpan.class);if (link.length != 0) {if (action == MotionEvent.ACTION_UP) {link[0].onClick(widget);buffer.setSpan(new BackgroundColorSpan(Color.TRANSPARENT),buffer.getSpanStart(link[0]),buffer.getSpanEnd(link[0]),Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);} else if (action == MotionEvent.ACTION_DOWN) {buffer.setSpan(new BackgroundColorSpan(Color.GRAY),buffer.getSpanStart(link[0]),buffer.getSpanEnd(link[0]),Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);Selection.setSelection(buffer,buffer.getSpanStart(link[0]),buffer.getSpanEnd(link[0]));}return true;} else {Selection.removeSelection(buffer);}}return Touch.onTouchEvent(widget, buffer, event);}}

最后TextViewActivity.java：

package com.example.scrolltextview2;import android.app.Activity;import android.graphics.drawable.Drawable;import android.os.Bundle;import android.text.Spannable;import android.text.SpannableString;import android.text.style.ClickableSpan;import android.text.style.ImageSpan;import android.view.View;import android.widget.TextView;public class TextViewActivity extends Activity {private TextView tv;private String status = "up";private String str = "Android是一种基于Linux的自由及开放源代码的操作系统，主要使用于移动设备，如智能手机和平板电脑，由Google公司和开放手机联盟领导及开发。";private String str_show = "";private int maxlength = 50;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);tv = (TextView) findViewById(R.id.textView1);if (str.length() < maxlength) {tv.setText(str);} else {changStatus();}}private void changStatus() {tv.setText("");Drawable drawable = null;if (status.equals("down")) {drawable = getResources().getDrawable(R.drawable.icon_arrow_up);status = "up";str_show = str;tv.setMaxLines(10000);} else if (status.equals("up")) {drawable = getResources().getDrawable(R.drawable.icon_arrow_down);status = "down";tv.setMaxLines(2);str_show = str.substring(0, maxlength);str_show += "...";}String spanString = str_show;spanString = spanString.substring(0, spanString.length());drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),drawable.getIntrinsicHeight());SpannableString spannable = new SpannableString(spanString.toString()+ "s");ImageSpan span = new ImageSpan(drawable, ImageSpan.ALIGN_BASELINE);spannable.setSpan(span, spanString.toString().length(), spanString.toString().length() + "s".length(),Spannable.SPAN_INCLUSIVE_EXCLUSIVE);ClickableSpan rightClickableSpan = new ClickableSpan() {@Overridepublic void onClick(View view) {changStatus();}};spannable.setSpan(rightClickableSpan, spanString.toString().length(),spanString.toString().length() + "s".length(),Spannable.SPAN_INCLUSIVE_EXCLUSIVE);tv.setText(spannable);tv.setMovementMethod(new MyTouch());}}

下载地址如下：

http://download.csdn.net/detail/hehaiminginadth/9084527

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