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：

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:background="@color/color_white" >

android:id="@+id/desc_tv"

style="@style/font2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:gravity="center_vertical" />

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" />

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得牛网。