Android開發(fā)之仿微信顯示更多文字的View

2019-11-09 17:53:34

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供稿：網(wǎng)友

最近開發(fā)需求中要模仿微信朋友圈文章的展開收起功能,網(wǎng)上找了找,發(fā)現(xiàn)都有問題,于是乎自己在前輩的基礎(chǔ)上進(jìn)行了一定量的修改,下邊將源碼貼出來供大家參考:1.主Activity布局文件就不粘貼了,很簡(jiǎn)單,就一個(gè)ListView.2.主Activity功能實(shí)現(xiàn):<font face="宋體" size="3">package com.example.textviewdemo; import java.util.HashMap; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ListView; import android.widget.TextView; import android.widget.TextView.BufferType; public class MainActivity extends Activity { String mStr; int type; @Override PRotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Globl.map = new HashMap<Integer, Boolean>(); ListView listview = (ListView) findViewById(R.id.listview); mStr = "手指在ListView上下滾動(dòng)時(shí)，ListViewItem背景變黑，因?yàn)樵跐L動(dòng)的時(shí)候?yàn)榱颂嵘阅茏隽藘?yōu)化，為提高滾動(dòng)的性能，Android 框架在ListView中引入CacheColorHint屬性。如果該值為非0，則說明該ListView繪制在單色不透明的背景上，在默認(rèn)情況下該值為 #191919，也就是黑色主題中的黑色背景顏色值，這樣當(dāng)ListView滾動(dòng)的時(shí)候"; listview.setAdapter(new MyListAdpter(this)); } class MyListAdpter extends BaseAdapter { Context con; CollapsibleTextView tv; public MyListAdpter(Context con) { this.con = con; } @Override public int getCount() { // TODO Auto-generated method stub return 10; } @Override public Object getItem(int position) { // TODO Auto-generated method stub return null; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return 0; } HashMap<Integer, View> hashM = new HashMap<Integer, View>(); @Override public View getView(int position, View convertView, ViewGroup parent) { Holder holder = null; View view; if (hashM.get(position) == null) { holder = new Holder(); view = LayoutInflater.from(con).inflate(R.layout.item_list, null); holder.tv = (CollapsibleTextView) view.findViewById(R.id.tv_text); holder.tvcount = (TextView) view.findViewById(R.id.tvcount); view.setTag(holder); hashM.put(position, view); } else { view = hashM.get(position); holder = (Holder) view.getTag(); } // if (Globl.map.get(position) == false) { // Globl.map.put(position, false); // type = 2; // } else { // type = 1; // } // tv.setNowType(type); // int typeNow = tv.getNowType(); holder.tvcount.setText(position + ""); holder.tv.setDesc(mStr, holder.tv, BufferType.NORMAL); return view; } class Holder { CollapsibleTextView tv; TextView tvcount; } } } 3.自定義控件CollapsibleTextView 源碼:<font face="宋體" size="3">/** * @Explain: Text過長收起帶有查看全文/收起功能控件; * @Author：LYl * @Time：2014-11-27 下午4:33:05 * @Version V2.1.54 */ public class CollapsibleTextView extends LinearLayout implements OnClickListener { /** 最大顯示的行數(shù) */ private static final int DEFAULT_MAX_LINE_COUNT = 8; /** 實(shí)際展示的行數(shù) */ private static final int DEFAULT_SHOW_LINE_COUNT = 6; private static final int COLLAPSIBLE_STATE_NONE = 0; /** View處于展開狀態(tài) **/ private static final int COLLAPSIBLE_STATE_SHRINKUP = 1; /** view收縮時(shí)狀態(tài) **/ private static final int COLLAPSIBLE_STATE_SPREAD = 2; /** 顯示內(nèi)容的View */ private TextView tv_context; /** 展開/收起按鈕 */ private TextView bt_spread; private String shrinkup; private String spread; /** 當(dāng)前正處于的狀態(tài) */ // private int mState; private boolean flag; private int nowType; private CollapsibleTextView coTextView; /** 判斷是不是點(diǎn)擊了查看更多、收起 */ private boolean isClicke = false; private int lookCount = 0; public CollapsibleTextView(Context context, AttributeSet attrs) { super(context, attrs); shrinkup = "收起"; spread = "查看全文"; View view = inflate(context, R.layout.collapsible_textview, this); view.setPadding(0, -1, 0, 0); tv_context = (TextView) view.findViewById(R.id.tv_context); bt_spread = (TextView) view.findViewById(R.id.bt_spread); bt_spread.setOnClickListener(this); } public CollapsibleTextView(Context context) { this(context, null); } /** * 賦值 */ public final void setDesc(CharSequence charSequence, CollapsibleTextView tv, BufferType bufferType) { this.coTextView = tv; // 對(duì)內(nèi)容中的網(wǎng)址進(jìn)行處理; tv_context.setAutoLinkMask(Linkify.WEB_URLS); tv_context.setMovementMethod(LinkMovementMethod.getInstance()); tv_context.setText(charSequence, bufferType); // 初始類型 if (lookCount == 0) { coTextView.setNowType(COLLAPSIBLE_STATE_SPREAD); } lookCount += 1; // TODO LYL 放到ListView中需要加下句:falg=false;一般情況去掉就可 flag = false; requestLayout(); } @Override public void onClick(View v) { flag = false; isClicke = true; requestLayout(); } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); if (!flag) { flag = true; if (tv_context.getLineCount() <= DEFAULT_MAX_LINE_COUNT) { bt_spread.setVisibility(View.GONE); tv_context.setMaxLines(DEFAULT_MAX_LINE_COUNT + 1); coTextView.setNowType(COLLAPSIBLE_STATE_NONE); } else { post(new InnerRunnable()); } } } class InnerRunnable implements Runnable { @Override public void run() { int zType = 0; // 第一次進(jìn)入操作（沒有點(diǎn)擊并且是第一次進(jìn)入）； System.out.println("lookCount:" + lookCount); if (!isClicke && lookCount == 1) { if (coTextView.getNowType() == COLLAPSIBLE_STATE_SPREAD) { tv_context.setMaxLines(DEFAULT_SHOW_LINE_COUNT); bt_spread.setVisibility(View.VISIBLE); bt_spread.setText(spread); zType = COLLAPSIBLE_STATE_SHRINKUP; } else if (coTextView.getNowType() == COLLAPSIBLE_STATE_SHRINKUP) { tv_context.setMaxLines(Integer.MAX_VALUE); bt_spread.setVisibility(View.VISIBLE); bt_spread.setText(shrinkup); zType = COLLAPSIBLE_STATE_SPREAD; } coTextView.setNowType(zType); // 點(diǎn)擊了查看更多、收起轉(zhuǎn)換狀態(tài)； } else if (isClicke) { isClicke = false; if (coTextView.getNowType() == COLLAPSIBLE_STATE_SPREAD) { tv_context.setMaxLines(DEFAULT_SHOW_LINE_COUNT); bt_spread.setVisibility(View.VISIBLE); bt_spread.setText(spread); coTextView.setNowType(COLLAPSIBLE_STATE_SHRINKUP); } else if (coTextView.getNowType() == COLLAPSIBLE_STATE_SHRINKUP) { tv_context.setMaxLines(Integer.MAX_VALUE); bt_spread.setVisibility(View.VISIBLE); bt_spread.setText(shrinkup); coTextView.setNowType(COLLAPSIBLE_STATE_SPREAD); } // 滑動(dòng)listView 從新載入到可見界面不做操作，保持原有狀態(tài)；(為了后面看得人能夠更理解寫上) } else if (!isClicke && lookCount != 1) { } } } public int getNowType() { return nowType; } public void setNowType(int nowType) { this.nowType = nowType; } }public class CollapsiblePanel extends LinearLayout { /** * TAG */ private static final String TAG = "CollapsiblePanel"; /** * DEBUG */ private static final boolean DEBUG = BuildConfig.DEBUG; /** * 內(nèi)容View */ private View mContentView; /** * 可收縮的View */ private View mCollapsibleView; /** * 可收縮的大小 */ private int mCollapsibleSize; /** * 收縮的監(jiān)聽器 */ private OnCollapsibleListener mCollapsibleListener; /** * 收縮動(dòng)畫的時(shí)間 */ private int mAnimDuration = 0; //SUPPRESS CHECKSTYLE /** * 判斷當(dāng)前可收縮View是否是打開狀態(tài) */ private boolean mIsOpened = false; /** * 可收縮View默認(rèn)是否可見 */ private boolean mCollapsibleViewDefaultVisible = false; /** * Toggle是否可用 */ private boolean mToggleEnable = true; /** * 不使用Alpha動(dòng)畫 */ private boolean mWithoutAlphaAnim = true; /** * 收縮是否有動(dòng)畫效果 */ private boolean mDoAnimation = true; public interface OnCollapsibleListener { /** * 動(dòng)畫結(jié)束監(jiān)聽 * * @param isOpened 當(dāng)前的stretchView是否是打開的, */ void onCollapsibleFinished(boolean isOpened); /** * 動(dòng)畫過程中使用Transformation的接口 * * @param from from * @param to to * @param interpolatedTime interpolatedTime */ void applyTransformation(int from, int to, float interpolatedTime); } /** * 構(gòu)造方法 * * @param context context */ public CollapsiblePanel(Context context) { super(context); init(context, null); } /** * 構(gòu)造方法 * * @param context context * @param attrs attrs */ public CollapsiblePanel(Context context, AttributeSet attrs) { super(context, attrs); init(context, attrs); } /** * 構(gòu)造方法 * * @param context context * @param attrs attrs * @param defStyle defStyle */ @SuppressLint("NewApi") @TargetApi(Build.VERSION_CODES.HONEYCOMB) public CollapsiblePanel(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); init(context, attrs); } /** * 初始化 * * @param context context * @param attrs attrs */ private void init(Context context, AttributeSet attrs) { setOrientation(LinearLayout.VERTICAL); mAnimDuration = 280; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { if (mCollapsibleSize == 0 && mCollapsibleView != null) { mCollapsibleView.measure(widthMeasureSpec, MeasureSpec.UNSPECIFIED); if (LinearLayout.VERTICAL == getOrientation()) { mCollapsibleSize = mCollapsibleView.getMeasuredHeight(); if (!mCollapsibleViewDefaultVisible) { mCollapsibleView.getLayoutParams().height = 0; } } else { mCollapsibleSize = mCollapsibleView.getMeasuredWidth(); if (!mCollapsibleViewDefaultVisible) { mCollapsibleView.getLayoutParams().width = 0; } } } super.onMeasure(widthMeasureSpec, heightMeasureSpec); } /** * 設(shè)置控件初始時(shí)是否可見 * * @param visible 是否可見 */ public void setCollapsibleViewDefaultVisible(boolean visible) { mCollapsibleViewDefaultVisible = visible; // 默認(rèn)可見的話，則認(rèn)為是展開的 mIsOpened = visible; } /** * 控件初始時(shí)是否可見 * * @return visible */ public boolean getCollapsibleViewDefaultVisible() { return mCollapsibleViewDefaultVisible; } /** * 設(shè)置toggle是否可用，如果設(shè)置為false，則{@link #toggle()}接口無效 * * @param enable enable */ public void setToggleEnable(boolean enable) { mToggleEnable = enable; } /** * 獲取當(dāng)前的主View * * @return view */ public View getContentView() { return mContentView; } /** * 獲取當(dāng)前的擴(kuò)展View * * @return view */ public View getStretchView() { return mCollapsibleView; } /** * 設(shè)置主View * * @param view view */ public void setContentView(View view) { if (view != null) { if (mContentView != null) { removeView(this.mContentView); } mContentView = view; addView(mContentView, 0); } } /** * 設(shè)置收縮的View * * @param collapsibleView 可以收縮的View */ public void setCollapsibleView(View collapsibleView) { if (collapsibleView != null) { if (mCollapsibleView != null) { removeView(mCollapsibleView); // 在重新設(shè)置時(shí)，將該值置為0，否則新view將不能顯示正確的高度 mCollapsibleSize = 0; } mCollapsibleView = collapsibleView; addView(mCollapsibleView); } } /** * 得到可收縮View的大小 * * @return 可收縮View的大小 */ public int getCollapsibleSize() { return mCollapsibleSize; } /** * 設(shè)置收縮的監(jiān)聽 * * @param listener listener */ public void setOnCollapsibleListener(OnCollapsibleListener listener) { mCollapsibleListener = listener; } /** * 當(dāng)前的視圖是否已經(jīng)展開 * * @return true/false */ public boolean isCollapsibleViewOpened() { return mIsOpened; } /** * 設(shè)置展開（或者收縮）動(dòng)畫的時(shí)間，默認(rèn)280ms * * @param durationMs durationMs */ public void setCollapsibleAnimDuration(int durationMs) { if (durationMs >= 0) { mAnimDuration = durationMs; } else { throw new IllegalArgumentException("Animation duration cannot be negative"); } } /** * 展開/收起View * * @return true/false */ public boolean toggle() { // 如果不允許展開 if (!mToggleEnable) { return false; } // 如果動(dòng)畫正在進(jìn)行，不執(zhí)行任何操作 if (isAnimationPlaying()) { return false; } if (mIsOpened) { closeCollapsibleView(); } else { openCollapsibleView(); } return true; } /** * 展開視圖 */ public void openCollapsibleView() { if (mCollapsibleView == null) { return; } post(new Runnable() { @Override public void run() { if (mDoAnimation) { CollapsibleAnimation animation = new CollapsibleAnimation(0, mCollapsibleSize, 0.0f, 1.0f); animation.setDuration(mAnimDuration); animation.setAnimationListener(mCollapsibleAnimListener); mCollapsibleView.startAnimation(animation); invalidate(); } else { setCollapsibleViewSize(mCollapsibleSize); onCollapsibleEnd(); } } }); } /** * 收起視圖 */ public void closeCollapsibleView() { if (mCollapsibleView == null) { return; } post(new Runnable() { @Override public void run() { if (mDoAnimation) { CollapsibleAnimation animation = new CollapsibleAnimation(mCollapsibleSize, 0, 1.0f, 0.0f); animation.setDuration(mAnimDuration); animation.setAnimationListener(mCollapsibleAnimListener); mCollapsibleView.startAnimation(animation); invalidate(); } else { setCollapsibleViewSize(0); onCollapsibleEnd(); } } }); } /** * 收縮View展開或收縮時(shí)調(diào)用 * * @param isOpened isOpened */ protected void onCollapsibleFinished(boolean isOpened) { } /** * 重置大小 */ protected void resetCollapsibleSize() { mCollapsibleSize = 0; requestLayout(); } /** * 設(shè)置收縮View的大小 * * @param size size */ private void setCollapsibleViewSize(int size) { if (null == mCollapsibleView) { return; } LayoutParams params = (LayoutParams) mCollapsibleView.getLayoutParams(); if (null != params) { if (LinearLayout.VERTICAL == getOrientation()) { params.height = size; } else { params.width = size; } mCollapsibleView.setLayoutParams(params); } } /** * 判斷動(dòng)畫是否正在播放 * * @return true/false */ private boolean isAnimationPlaying() { if (null != mCollapsibleView) { Animation anim = mCollapsibleView.getAnimation(); if (null != anim && !anim.hasEnded()) { return true; } } return false; } /** * 動(dòng)畫的監(jiān)聽器 */ private AnimationListener mCollapsibleAnimListener = new AnimationListener() { @Override public void onAnimationStart(Animation animation) { } @Override public void onAnimationRepeat(Animation animation) { } @Override public void onAnimationEnd(Animation animation) { onCollapsibleEnd(); } }; /** * 收縮結(jié)束時(shí)調(diào)用 */ private void onCollapsibleEnd() { mIsOpened = !mIsOpened; if (mCollapsibleListener != null) { mCollapsibleListener.onCollapsibleFinished(mIsOpened); } if (null != mCollapsibleView) { mCollapsibleView.setAnimation(null); } onCollapsibleFinished(mIsOpened); } /** * 伸縮動(dòng)畫 */ private class CollapsibleAnimation extends Animation { /** * 開始的大小 */ private int mFromSize; /** * 結(jié)束的大小 */ private int mToSize; /** * 開始的Alpha */ private float mFromAlpha; /** * 結(jié)束的Alpha */ private float mToAlpha; /** * 構(gòu)造方法 * * @param fromSize 初始的大小 * @param toSize 結(jié)束的大小 * @param fromAlpha 初始的透明度 * @param toAlpha 結(jié)束的透明度 */ public CollapsibleAnimation(int fromSize, int toSize, float fromAlpha, float toAlpha) { mFromSize = fromSize; mToSize = toSize; mFromAlpha = fromAlpha; mToAlpha = toAlpha; } @Override public boolean willChangeBounds() { return true; } @Override protected void applyTransformation(float interpolatedTime, Transformation t) { if (mCollapsibleView != null) { if (mWithoutAlphaAnim) { // Do nothing } else { // 改變透明度 final float alpha = mFromAlpha; t.setAlpha(alpha + ((mToAlpha - alpha) * interpolatedTime)); } // 改變大小 final int fromSize = mFromSize; int size = (int) (fromSize + (mToSize - fromSize) * interpolatedTime); setCollapsibleViewSize(size); if (null != mCollapsibleListener) { mCollapsibleListener.applyTransformation(mFromSize, mToSize, interpolatedTime); } } } }}

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