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Android开发展开收起功能

news 2025/8/26 7:03:38

Android开发展开收起功能

文字过长展开收起功能很普通，也很需要。

一、思路：

自定义控件MoreTextView

二、效果图：

在这里插入图片描述

三、关键代码：

public class MoreTextView2 extends LinearLayout {/*** TextView的实际高度*/private int textViewHeight;/*** 默认全文的Text*/private static final String EXPANDEDTEXT = "全文";/*** 默认收起的text*/private static final String COLLAPSEDTEXT = "收起";/*** 全文的text*/private String expandedText;/*** 收起的text*/private String collapsedText;/*** 字体大小*/private int textSize;/*** 字体颜色*/private int textColor;/*** 超过多少行出现全文、收起按钮*/private int trimLines;/*** 显示文本的TextView*/private TextView showTextView;/*** 全文和收起的TextView*/private TextView collapseTextView;/*** 是否是收起状态，默认收起*/private boolean collapsed = true;private boolean show;public MoreTextView2(Context context, AttributeSet attrs) {super(context, attrs);initView(context, attrs);}public MoreTextView2(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);initView(context, attrs);}@TargetApi(Build.VERSION_CODES.LOLLIPOP)public MoreTextView2(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {super(context, attrs, defStyleAttr, defStyleRes);initView(context, attrs);}private void initView(Context context, AttributeSet attrs) {showTextView = new TextView(context);setOrientation(VERTICAL);TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.MoreTextView2);textColor = typedArray.getColor(R.styleable.MoreTextView2_textColor, Color.GRAY);textSize = typedArray.getDimensionPixelSize(R.styleable.MoreTextView2_textSize, 14);expandedText = typedArray.getString(R.styleable.MoreTextView2_expandedText);if (TextUtils.isEmpty(expandedText)) {expandedText = EXPANDEDTEXT;}collapsedText = typedArray.getString(R.styleable.MoreTextView2_collapsedText);if (TextUtils.isEmpty(collapsedText)) {collapsedText = COLLAPSEDTEXT;}trimLines = typedArray.getInt(R.styleable.MoreTextView2_trimLines, 0);typedArray.recycle();showTextView.setTextSize(textSize);showTextView.setTextColor(textColor);showTextView.setLineSpacing(3f, 1.2f);//hint(没有自我介绍内容时的默认显示)SpannableString ss = new SpannableString(getResources().getString(R.string.formal_tips));//定义hint的值AbsoluteSizeSpan ass = new AbsoluteSizeSpan(14, true);//设置字体大小 true表示单位是spss.setSpan(ass, 0, ss.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);showTextView.setHint(new SpannedString(ss));showTextView.setHintTextColor(getResources().getColor(R.color.text_aaa));addView(showTextView);}public void setText(CharSequence text) {showTextView.setText(text);globalLayout();requestLayout();invalidate();sum();}