/*
* Copyright (C) 2011 The Android Open Source Project
* Copyright 2014 Manabu Shimobe
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.jaydenxiao.androidfire.ui.zone.widget;
import android.animation.Animator;
import android.animation.ValueAnimator;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.support.v4.content.ContextCompat;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.SparseBooleanArray;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.jaydenxiao.androidfire.R;
import com.jaydenxiao.common.commonutils.DisplayUtil;
public class ExpandableTextView extends LinearLayout implements View.OnClickListener {
/* 默认最高行数 */
private static final int MAX_COLLAPSED_LINES = 5;
/* 默认动画执行时间 */
private static final int DEFAULT_ANIM_DURATION = 200;
/*内容textview*/
protected TextView mTvContent;
/*展开收起textview*/
protected TextView mTvExpandCollapse;
/*是否有重新绘制*/
private boolean mRelayout;
/*默认收起*/
private boolean mCollapsed = true;
/*展开图片*/
private Drawable mExpandDrawable;
/*收起图片*/
private Drawable mCollapseDrawable;
/*动画执行时间*/
private int mAnimationDuration;
/*是否正在执行动画*/
private boolean mAnimating;
/* 展开收起状态回调 */
private OnExpandStateChangeListener mListener;
/* listview等列表情况下保存每个item的收起/展开状态 */
private SparseBooleanArray mCollapsedStatus;
/* 列表位置 */
private int mPosition;
/*设置内容最大行数，超过隐藏*/
private int mMaxCollapsedLines;
/*这个linerlayout容器的高度*/
private int mCollapsedHeight;
/*内容tv真实高度（含padding）*/
private int mTextHeightWithMaxLines;
/*内容tvMarginTopAmndBottom高度*/
private int mMarginBetweenTxtAndBottom;
/*内容颜色*/
private int contentTextColor;
/*收起展开颜色*/
private int collapseExpandTextColor;
/*内容字体大小*/
private float contentTextSize;
/*收起展字体大小*/
private float collapseExpandTextSize;
/*收起文字*/
private String textCollapse;
/*展开文字*/
private String textExpand;
//是否显示图标
private boolean showExpandCollapseDrawable=true;
/*收起展开位置，默认左边*/
private int grarity;
public ExpandableTextView(Context context) {
this(context, null);
}
public ExpandableTextView(Context context, AttributeSet attrs) {
super(context, attrs);
init(attrs);
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public ExpandableTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(attrs);
}
@Override
public void setOrientation(int orientation) {
if (LinearLayout.HORIZONTAL == orientation) {
throw new IllegalArgumentException("ExpandableTextView only supports Vertical Orientation.");
}
super.setOrientation(orientation);
}
/**
* 初始化属性
* @param attrs
*/
private void init(AttributeSet attrs) {
mCollapsedStatus=new SparseBooleanArray();
TypedArray typedArray = getContext().obtainStyledAttributes(attrs, R.styleable.ExpandableTextView);
mMaxCollapsedLines = typedArray.getInt(R.styleable.ExpandableTextView_maxCollapsedLines, MAX_COLLAPSED_LINES);
mAnimationDuration = typedArray.getInt(R.styleable.ExpandableTextView_animDuration, DEFAULT_ANIM_DURATION);
mExpandDrawable = typedArray.getDrawable(R.styleable.ExpandableTextView_expandDrawable);
mCollapseDrawable = typedArray.getDrawable(R.styleable.ExpandableTextView_collapseDrawable);
textCollapse = typedArray.getString(R.styleable.ExpandableTextView_textCollapse);
textExpand = typedArray.getString(R.styleable.ExpandableTextView_textExpand);
showExpandCollapseDrawable=typedArray.getBoolean(R.styleable.ExpandableTextView_showExpandCollapseDrawable,true);
if(showExpandCollapseDrawable) {
if (mExpandDrawable == null) {
mExpandDrawable = ContextCompat.getDrawable(getContext(), R.drawable.icon_green_arrow_down);
}
if (mCollapseDrawable == null) {
mCollapseDrawable = ContextCompat.getDrawable(getContext(), R.drawable.icon_green_arrow_up);
}
}
if (TextUtils.isEmpty(textCollapse)) {
textCollapse = getContext().getString(R.string.shink);
}
if (TextUtils.isEmpty(textExpand)) {
textExpand = getContext().getString(R.string.expand);
}
contentTextColor = typedArray.getColor(R.styleable.ExpandableTextView_contentTextColor, ContextCompat.getColor(getContext(), R.color.light_gray));
contentTextSize = typedArray.getDimension(R.styleable.ExpandableTextView_contentTextSize, DisplayUtil.sp2px(14));
collapseExpandTextColor = typedArray.getColor(R.styleable.ExpandableTextView_collapseExpandTextColor, ContextCompat.getColor(getContext(), R.color.main_color));
collapseExpandTextSize = typedArray.getDimension(R.styleable.ExpandableTextView_collapseExpandTextSize, DisplayUtil.sp2px(14));
grarity = typedArray.getInt(R.styleable.ExpandableTextView_collapseExpandGrarity, Gravity.LEFT);
typedArray.recycle();
// enforces vertical orientation
setOrientation(LinearLayout.VERTICAL);
// default visibility is gone
setVisibility(GONE);
}
/**
* 渲染完成时初始化view
*/
@Override
protected void onFinishInflate() {
findViews();
}
/**
* 初始化viwe
*/
private void findViews() {
LayoutInflater inflater = (LayoutInflater) getContext()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater.inflate(R.layout.item_expand_shink, this);
mTvContent = (TextView) findViewById(R.id.expandable_text);
mTvContent.setOnClickListener(this);
mTvExpandCollapse = (TextView) findViewById(R.id.expand_collapse);
if(showExpandCollapseDrawable) {
mTvExpandCollapse.setCompoundDrawablesWithIntrinsicBounds(null, null, mCollapsed ? mExpandDrawable : mCollapseDrawable, null);
}
mTvExpandCollapse.setText(mCollapsed ? getResources().getString(R.string.expand) : getResources().getString(R.string.shink));
mTvExpandCollapse.setOnClickListener(this);
mTvContent.setTextColor(contentTextColor);
mTvContent.getPaint().setTextSize(contentTextSize);
mTvExpandCollapse.setTextColor(collapseExpandTextColor);
mTvExpandCollapse.getPaint().setTextSize(collapseExpandTextSize);
//设置收起展开位置：左或者右
LayoutParams lp = new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
lp.gravity = grarity;
mTvExpandCollapse.setLayoutParams(lp);
}
/**
* 点击事件
* @param view
*/
@Override
public void onClick(View view) {
if (mTvExpandCollapse.getVisibility() != View.VISIBLE) {
return;
}
mCollapsed = !mCollapsed;
//修改收起/展开图标、文字
if(showExpandCollapseDrawable) {
mTvExpandCollapse.setCompoundDrawablesWithIntrinsicBounds(null, null, mCollapsed ? mExpandDrawable : mCollapseDrawable, null);
}
mTvExpandCollapse.setText(mCollapsed ? getResources().getString(R.string.expand) : getResources().getString(R.string.shink));
//保存位置状态
if (mCollapsedStatus != null) {
mCollapsedStatus.put(mPosition, mCollapsed);
}
// 执行展开/收起动画
mAnimating = true;
ValueAnimator valueAnimator;
if (mCollapsed) {
// mTvContent.setMaxLines(mMaxCollapsedLines);
valueAnimator = new ValueAnimator().ofInt(getHeight(), mCollapsedHeight);
} else {
valueAnimator = new ValueAnimator().ofInt(getHeight(), getHeight() +
mTextHeightWithMaxLines - mTvContent.getHeight());
}
valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener(){
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
int animatedValue = (int) valueAnimator.getAnimatedValue();
mTvContent.setMaxHeight(animatedValue - mMarginBetweenTxtAndBottom);
getLayoutParams().height = animatedValue;
requestLayout();
}
});
valueAnimator.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animator) {
}
@Override
public void onAnimationEnd(Animator animator) {
// 动画结束后发送结束的信号
/// clear the animation flag
mAnimating = false;
// notify the listener
if (mListener != null) {
mListener.onExpandStateChanged(mTvContent, !mCollapsed);
}
}
@Override
public void onAnimationCancel(Animator animator) {
}
@Override
public void onAnimationRepeat(Animator animator) {
}
});
valueAnimator.setDuration(mAnimationDuration);
valueAnimator.start();
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
// 当动画还在执行状态时，拦截事件，不让child处理
return mAnimating;
}
/**
* 重新测量
* @param widthMeasureSpec
* @param heightMeasureSpec
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// If no change, measure and return
if (!mRelayout || getVisibility() == View.GONE) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
return;
}
mRelayout = false;
// Setup with optimistic case
// i.e. Everything fits. No button needed
mTvExpandCollapse.setVisibility(View.GONE);
mTvContent.setMaxLines(Integer.MAX_VALUE);
// Measure
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
//如果内容真实行数小于等于最大行数，不处理
if (mTvContent.getLineCount() <= mMaxCollapsedLines) {
return;
}
// 获取内容tv真实高度（含padding）
mTextHeightWithMaxLines = getRealTextViewHeight(mTvContent);
// 如果是收起状态，重新设置最大行数
if (mCollapsed) {
mTvContent.setMaxLines(mMaxCollapsedLines);
}
mTvExpandCollapse.setVisibility(View.VISIBLE);
// Re-measure with new setup
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if (mCollapsed) {
// Gets the margin between the TextView's bottom and the ViewGroup's bottom
mTvContent.post(new Runnable() {
@Override
public void run() {
mMarginBetweenTxtAndBottom = getHeight() - mTvContent.getHeight();
}
});
// 保存这个容器的测量高度
mCollapsedHeight = getMeasuredHeight();
}
}
/**
* 获取内容tv真实高度（含padding）
* @param textView
* @return
*/
private static int getRealTextViewHeight( TextView textView) {
int textHeight = textView.getLayout().getLineTop(textView.getLineCount());
int padding = textView.getCompoundPaddingTop() + textView.getCompoundPaddingBottom();
return textHeight + padding;
}
/*********暴露给外部调用方法***********/
/**
* 设置收起/展开监听
* @param listener
*/
public void setOnExpandStateChangeListener( OnExpandStateChangeListener listener) {
mListener = listener;
}
/**
* 设置内容
* @param text
*/
public void setText( CharSequence text) {
mRelayout = true;
mTvContent.setText(text);
setVisibility(TextUtils.isEmpty(text) ? View.GONE : View.VISIBLE);
}
/**
* 设置内容，列表情况下，带有保存位置收起/展开状态
* @param text
* @param position
*/
public void setText( CharSequence text,int position) {
mPosition = position;
//获取状态，如无，默认是true:收起
mCollapsed = mCollapsedStatus.get(position, true);
clearAnimation();
//设置收起/展开图标和文字
if(showExpandCollapseDrawable) {
mTvExpandCollapse.setCompoundDrawablesWithIntrinsicBounds(null, null, mCollapsed ? mExpandDrawable : mCollapseDrawable, null);
}
mTvExpandCollapse.setText(mCollapsed ? getResources().getString(R.string.expand) : getResources().getString(R.string.shink));
setText(text);
getLayoutParams().height = ViewGroup.LayoutParams.WRAP_CONTENT;
requestLayout();
}
/**
* 获取内容
* @return
*/
public CharSequence getText() {
if (mTvContent == null) {
return "";
}
return mTvContent.getText();
}
/**
* 定义状态改变接口
*/
public interface OnExpandStateChangeListener {
/**
* @param textView - TextView being expanded/collapsed
* @param isExpanded - true if the TextView has been expanded
*/
void onExpandStateChanged(TextView textView, boolean isExpanded);
}
}