Android显示全文折叠控件使用方法详解

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

您可能感兴趣的文章:

• Android UI实现多行文本折叠展开效果
• Android TextView多文本折叠展开效果
• Android TextView实现多文本折叠、展开效果
• Android中RecyclerView实现多级折叠列表效果（二）
• Android中RecyclerView实现多级折叠列表效果(TreeRecyclerView)
• Android折叠式Toolbar使用完全解析（CollapsingToolbarLayout）
• android给RecyclerView加上折叠的效果示例
• Android中FoldingLayout折叠布局的用法及实战全攻略
• Android TextView仿微信可折叠效果
• Android开发实现的文本折叠点击展开功能示例