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Android TextView全文

<Excerpt in index | 首页摘要>

Android 自定义Textview(全文/收起)

<The rest of contents | 余下全文>
简单说,项目需要长文章缩略显示5行,点击全文展开。

能想到的实现方式有两种,
1:继承TextView,重写测量和layout方法。
2:利用Textview的一个属性,投机取巧实现

目前比较赶项目,用第二种,将来时间宽裕了,在去实现第一种吧。
(PS: 技术债务)

简单介绍下,就是利用maxLines这个属性,平常时候显示5行,点击全文显示Integer.MAX_VALUE。


上代码:自定义控件XML:
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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/alpha"
android:orientation="vertical">

<TextView
android:id="@+id/stretch_content"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:lineSpacingExtra="5dp"
android:background="@color/alpha"
android:textColor="@color/TvTextColor"
android:textSize="14sp" />

<TextView
android:id="@+id/stretch_fulltext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:background="@color/alpha"
android:text="全文"
android:textColor="@color/selector_time_axis_green_gray"
android:textSize="14sp"
android:visibility="invisible" />
</LinearLayout>

具体实现代码:

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package com.qingxiang.ui.view;

import android.content.Context;
import android.os.SystemClock;
import android.util.AttributeSet;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.TextView;

import com.qingxiang.ui.R;


/**
* 全文TextView
*
* @author Gloomy
*/
public class StretchTextView extends FrameLayout implements View.OnClickListener {
public static final String TAG = "StretchTextView";

private TextView content;
private TextView fullText;
private boolean isFullText = false;
private int previewSize = 5;
private int lineCount;

public StretchTextView(Context context, AttributeSet attrs) {
super(context, attrs);
View view = View.inflate(context, R.layout.layout_stretch_textview, this);
content = (TextView) view.findViewById(R.id.stretch_content);
fullText = (TextView) view.findViewById(R.id.stretch_fulltext);
fullText.setOnClickListener(this);
}

public void setText(String text, boolean isFullText) {
content.setText(text);

this.isFullText = isFullText;
content.setMaxLines(StretchTextView.this.isFullText ? Integer.MAX_VALUE : previewSize);

fullText.setText(isFullText ? "收起" : "全文");
content.post(() -> {
lineCount = content.getLineCount();
if (lineCount <= previewSize)
fullText.setVisibility(View.INVISIBLE);
else
fullText.setVisibility(View.VISIBLE);
});
}


@Override
public void onClick(View v) {
if (fullText.getVisibility() != View.VISIBLE)
return;
isFullText = !isFullText;

if (listener != null)
listener.onChange(isFullText);

fullText.setText(isFullText ? "收起" : "全文");
content.setMaxLines(isFullText ? lineCount : previewSize);
}

onChangeLinstener listener;

public void setListener(onChangeLinstener listener) {
this.listener = listener;
}

public interface onChangeLinstener {
void onChange(boolean on);
}
}