編輯:關於Android編程
貢獻/下載源碼:https://github.com/mmlovesyy/PopupWindowDemo
本文簡單模仿微信朋友圈的點贊和評論彈出框,布局等細節請忽略,著重實現彈出框、發評論,及彈出位置的控制。
1. 微信彈出框
微信朋友圈的點贊和評論功能,有2個組成部分:
點擊左下角的“更多”按鈕,彈出對話框;
點擊評論,彈出輸入框,添加評論並在頁面中實時顯示;
微信朋友圈點贊和評論功能
2. 實際效果
本文將建一個 ListView,在其 Item 中簡單模仿微信的布局,然後著重實現彈出窗,並能發評論,忽略具體布局細節。具體效果如下:
3. 知識點清單
ListView
自定義 Adapter,重寫 getView()方法;
PopupWindow
彈出框使用PopupWindow實現,這是點贊和評論的載體,具體要涉及 PopupWindow 點擊非窗口位置和再次點擊消失以及顯示位置的問題(根據相應更多按鈕的位置確定 PopupWindow 的顯示位置,關於 PopupWindow 的顯示位置,可以參考我的另一篇文章 Android PopupWindow 的顯示位置);
LayoutInflater
使用LayoutInflater 動態加載PopupWindow 的布局,關於 LayoutInflater 的更多知識,參見我的另一篇博客 Android LayoutInflater ;
Activity 和 Item 的雙向通信
通過自定義 OnCommentListener() 來實現 MainActivity(具體來說是屏幕底部評論框中的輸入的內容)和 ItemView(動態的獲得上述輸入的評論內容並展示在該ItemView 中) 的通信,更多知識參見我的另一篇博客《 燕過留聲:由 Activity 和 Fragment 的通信方法想到的》;
自定義控件
ListView 中的每個 Item 是一個自定義的 ItemView,記得要重寫構造方法,否則會拋出 Android.view.InflateException 異常;
如果想實現微信評論那樣用戶名和內容回復文字字體顏色不同,而且點擊評論用戶名觸發頁面跳轉等功能,請參見 《布局優化技巧筆記》 之 ClickableSpan 章節;
4. 美工素材
由於 .apk 本質上是個壓縮包,我們可以通過解壓得到該 .apk 文件的圖片素材和布局文件,更多獲得素材的方法參見我的另一篇博文 如何獲得Android素材圖片。通過這種方式得到顏色、更多按鈕的樣式等素材,僅供學習之用,請勿做侵犯版權之事。尊重知識版權既是大勢所趨,也是終將使每個開發者受益的事。
文件夾r裡存放圖片
找到更多按鈕
5. 關鍵代碼
開發環境:Android Studio 1.4.1 for Mac + ADT 21 + JDK 1.8.0。
MainAcitivity.Java
package main.zhaizu.com.popupwindowdemo; import android.content.Context; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.text.TextUtils; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.EditText; import android.widget.ListView; import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import main.zhaizu.com.popupwindowdemo.model.Comment; import main.zhaizu.com.popupwindowdemo.model.Item; import main.zhaizu.com.popupwindowdemo.ui.ItemView; public class MainActivity extends AppCompatActivity { private ListView mListView; private View mCommentView; private MyAdapter myAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mListView = (ListView) findViewById(R.id.listview); myAdapter = new MyAdapter(this, getData()); mListView.setAdapter(myAdapter); mCommentView = findViewById(R.id.comment_view); } // build data private ArrayList<Item> getData() { int ITEM_COUNT = 20; ArrayList<Item> data = new ArrayList<>(); data.add(new Item(R.drawable.xiaona, "薄荷栗", "我學過跆拳道,都給我跪下唱征服", "昨天")); data.add(new Item(R.drawable.xueyan, "欣然", "走遍天涯海角,唯有我家風景最好,啊哈哈", "昨天")); data.add(new Item(R.drawable.leishao, "陳磊_CL", "老子以後要當行長的,都來找我借錢吧,now", "昨天")); data.add(new Item(R.drawable.yuhong, "永恆依然", "房子車子都到碗裡來", "昨天")); data.add(new Item(R.drawable.lanshan, "藍珊", "你們這群傻×,我笑而不語", "昨天")); return data; } // custom adapter private class MyAdapter extends BaseAdapter implements ItemView.OnCommentListener { private Context context; private ArrayList<Item> mData; private Map<Integer, ItemView> mCachedViews = new HashMap<>(); public MyAdapter(Context context, ArrayList<Item> mData) { this.context = context; this.mData = mData; } @Override public int getCount() { return mData.size(); } @Override public Object getItem(int position) { return mData.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { View view; if (convertView != null) { view = convertView; } else { LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); view = inflater.inflate(R.layout.listview_item, null, false); } if (view instanceof ItemView) { Item data = (Item) getItem(position); ((ItemView) view).setData(data); ((ItemView) view).setPosition(position); ((ItemView) view).setCommentListener(this); cacheView(position, (ItemView) view); } return view; } @Override public void onComment(int position) { showCommentView(position); } private void cacheView(int position, ItemView view) { Iterator<Map.Entry<Integer, ItemView>> entries = mCachedViews.entrySet().iterator(); while (entries.hasNext()) { Map.Entry<Integer, ItemView> entry = entries.next(); if (entry.getValue() == view && entry.getKey() != position) { mCachedViews.remove(entry.getKey()); break; } } mCachedViews.put(position, view); } private void showCommentView(final int position) { mCommentView.setVisibility(View.VISIBLE); mCommentView.findViewById(R.id.submit).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { EditText et = (EditText) mCommentView.findViewById(R.id.edit); String s = et.getText().toString(); if (!TextUtils.isEmpty(s)) { // update model Comment comment = new Comment(s); mData.get(position).getComments().add(comment); // update view maybe ItemView itemView = mCachedViews.get(position); if (itemView != null && position == itemView.getPosition()) { itemView.addComment(); } et.setText(""); mCommentView.setVisibility(View.GONE); } } }); } } }
ItemView.java
package main.zhaizu.com.popupwindowdemo.ui; import android.content.Context; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.ColorDrawable; import android.util.AttributeSet; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.PopupWindow; import android.widget.TextView; import main.zhaizu.com.popupwindowdemo.R; import main.zhaizu.com.popupwindowdemo.model.Comment; import main.zhaizu.com.popupwindowdemo.model.Item; /** * Created by cmm on 15/10/31. */ public class ItemView extends LinearLayout implements View.OnClickListener { private int mPosition; private Item mData; private ImageView mPortraitView; private TextView mUserNameView; private TextView mContentView; private TextView mCreatedAtView; private LinearLayout mCommentLayout; private View mMoreView; private PopupWindow mMorePopupWindow; private int mShowMorePopupWindowWidth; private int mShowMorePopupWindowHeight; private OnCommentListener mCommentListener; public ItemView(Context context) { super(context); } public ItemView(Context context, AttributeSet attrs) { super(context, attrs); } public interface OnCommentListener { void onComment(int position); } @Override protected void onFinishInflate() { super.onFinishInflate(); mPortraitView = (ImageView) findViewById(R.id.portrait); mUserNameView = (TextView) findViewById(R.id.nick_name); mContentView = (TextView) findViewById(R.id.content); mCreatedAtView = (TextView) findViewById(R.id.created_at); mCommentLayout = (LinearLayout) findViewById(R.id.comment_layout); mMoreView = findViewById(R.id.more_btn); } public void setPosition(int mPosition) { this.mPosition = mPosition; } public void setCommentListener(OnCommentListener l) { this.mCommentListener = l; } public void setData(Item data) { mData = data; mPortraitView.setImageResource(data.getPortraitId()); mUserNameView.setText(data.getNickName()); mContentView.setText(data.getContent()); updateComment(); mMoreView.setOnClickListener(this); } /** * 彈出點贊和評論框 * * @param moreBtnView */ private void showMore(View moreBtnView) { if (mMorePopupWindow == null) { LayoutInflater li = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE); View content = li.inflate(R.layout.layout_more, null, false); mMorePopupWindow = new PopupWindow(content, ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); mMorePopupWindow.setBackgroundDrawable(new BitmapDrawable()); mMorePopupWindow.setOutsideTouchable(true); mMorePopupWindow.setTouchable(true); content.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED); mShowMorePopupWindowWidth = content.getMeasuredWidth(); mShowMorePopupWindowHeight = content.getMeasuredHeight(); View parent = mMorePopupWindow.getContentView(); TextView like = (TextView) parent.findViewById(R.id.like); TextView comment = (TextView) parent.findViewById(R.id.comment); // 點贊的監聽器 comment.setOnClickListener(this); } if (mMorePopupWindow.isShowing()) { mMorePopupWindow.dismiss(); } else { int heightMoreBtnView = moreBtnView.getHeight(); mMorePopupWindow.showAsDropDown(moreBtnView, -mShowMorePopupWindowWidth, -(mShowMorePopupWindowHeight + heightMoreBtnView) / 2); } } private void updateComment() { if (mData.hasComment()) { mCommentLayout.removeAllViews(); mCommentLayout.setVisibility(View.VISIBLE); for (Comment c : mData.getComments()) { TextView t = new TextView(getContext()); t.setLayoutParams(new LinearLayout.LayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT))); t.setBackgroundColor(getResources().getColor(R.color.colorCommentLayoutBg)); t.setTextSize(16); t.setPadding(5, 2, 0, 3); t.setLineSpacing(3, (float) 1.5); t.setText(c.getComment()); mCommentLayout.addView(t); } } else { mCommentLayout.setVisibility(View.GONE); } } @Override public void onClick(View v) { int id = v.getId(); if (id == R.id.more_btn) { showMore(v); } else if (id == R.id.comment) { if (mCommentListener != null) { mCommentListener.onComment(mPosition); if (mMorePopupWindow != null && mMorePopupWindow.isShowing()) { mMorePopupWindow.dismiss(); } } } } public int getPosition() { return mPosition; } public void addComment() { updateComment(); } }
以上所述是小編給大家介紹的Android 仿微信朋友圈點贊和評論彈出框功能,希望對大家有所幫助,如果大家有任何疑問請給我留言,小編會及時回復大家的。在此也非常感謝大家對本站網站的支持!
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