一般列表里文字太多的一个折叠效果的空间，效果图如下。

当文字超过设定的行数后就折叠，小于设定行数不显示展开按钮。下面上代码。

先看布局文件：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@color/color_white" > <TextView android:id="@+id/desc_tv" style="@style/font2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center_vertical" /> <TextView android:id="@+id/desc_op_tv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/desc_tv" android:gravity="center_vertical" android:singleLine="true" android:text="@string/quan_wen" android:textColor="#5f897b" android:textSize="16sp" android:visibility="gone" /></RelativeLayout>

很简单，上面的TextView显示主要的文本内容，下面的就是折叠的时候点击的。

下面是自定义。

package xxx;import android.annotation.SuppressLint;import android.content.Context;import android.os.Handler;import android.os.Message;import android.util.AttributeSet;import android.view.View;import android.widget.LinearLayout;import android.widget.TextView;import android.widget.TextView.BufferType;import xxx.R;/** * 查看全文控件 */public class CollapsibleTextView extends LinearLayout implements View.OnClickListener { private static final int COLLAPSIBLE_STATE_NONE = 0;// 不显示 private static final int COLLAPSIBLE_STATE_SHRINKUP = 1;// 显示收起 private static final int COLLAPSIBLE_STATE_SPREAD = 2;// 显示全文 private int mState = COLLAPSIBLE_STATE_SPREAD; private static final String COLLAPSIBLE_STATE_SHRINKUP_TEXT = "收起"; private static final String COLLAPSIBLE_STATE_SPREAD_TEXT = "全文"; private TextView mText; /** * @return Returns the mText. */ public TextView getmText() { return mText; } public int getmState() { return mState; } public void setmState(int mState) { this.mState = mState; } private TextView mTextTip; private changeState changeStateCallBack; private boolean isNeedLayout; private int maxLineCount = 8; private final Handler handler = new Handler() { @Override public void dispatchMessage(Message msg) { if (mText.getLineCount() <= maxLineCount) { // 行数不足不做处理 mState = COLLAPSIBLE_STATE_NONE; mText.setMaxLines(Integer.MAX_VALUE); mTextTip.setVisibility(View.GONE); } else { switch (mState) { case COLLAPSIBLE_STATE_SPREAD: // 全文状态 mText.setMaxLines(maxLineCount); mTextTip.setVisibility(View.VISIBLE); mTextTip.setText(COLLAPSIBLE_STATE_SPREAD_TEXT); break; case COLLAPSIBLE_STATE_SHRINKUP: // 收起状态 mText.setMaxLines(Integer.MAX_VALUE); mTextTip.setVisibility(View.VISIBLE); mTextTip.setText(COLLAPSIBLE_STATE_SHRINKUP_TEXT); break; default: // 除非发生不可知状态，一般不会执行到这个 mState = COLLAPSIBLE_STATE_NONE; mText.setMaxLines(Integer.MAX_VALUE); mTextTip.setVisibility(View.GONE); break; } } } }; public CollapsibleTextView(Context context) { this(context, null); initView(); } public CollapsibleTextView(Context context, AttributeSet attrs) { super(context, attrs); initView(); } @SuppressLint("NewApi") public CollapsibleTextView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); initView(); } private void initView() { View view = inflate(getContext(), R.layout.collapsible_textview, this); view.setPadding(0, -1, 0, 0); mText = (TextView) view.findViewById(R.id.desc_tv); mTextTip = (TextView) view.findViewById(R.id.desc_op_tv); mTextTip.setOnClickListener(this); } /** * 设置文本 * * @param charSequence * @param bufferType */ public final void setText(CharSequence charSequence, BufferType bufferType) { isNeedLayout = true; mState = COLLAPSIBLE_STATE_SPREAD; mText.setText(charSequence, bufferType); } /** * 设置文本 * * @param charSequence */ public final void setText(CharSequence charSequence) { isNeedLayout = true; mText.setText(charSequence); } @Override public void onClick(View v) { isNeedLayout = true; if (mState == COLLAPSIBLE_STATE_SPREAD) { // 如果是全文状态，就改成收起状态 mState = COLLAPSIBLE_STATE_SHRINKUP; requestLayout(); } else if (mState == COLLAPSIBLE_STATE_SHRINKUP) { // 如果是收起状态，就改成全文状态 mState = COLLAPSIBLE_STATE_SPREAD; requestLayout(); } if (null != changeStateCallBack) { changeStateCallBack.changeFlag(v); } } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); if (isNeedLayout) { isNeedLayout = false; handler.sendMessage(Message.obtain()); } } public int getMaxLineCount() { return maxLineCount; } public void setMaxLineCount(int maxLineCount) { this.maxLineCount = maxLineCount; } public changeState getChangeStateCallBack() { return changeStateCallBack; } public void setChangeStateCallBack(changeState changeStateCallBack) { this.changeStateCallBack = changeStateCallBack; } public interface changeState { public void changeFlag(View v); }}

点击展开后重新绘制根据状态值触发。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。