Android 显示全文折叠控件

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一般列表里文字太多的一个折叠效果的空间，效果图如下。

这里写图片描述

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。

转载请注明来源！

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