Android自定義TextView仿微信朋友圈文字信息，展開全文功能
代碼及注釋如下：
首先寫一個xml文件 showmore.xml：
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<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:id="@+id/content" android:layout_width="match_parent" android:layout_height="wrap_content" android:textSize="16sp" android:maxLines="3" android:ellipsize="end"/> <TextView android:id="@+id/hide_show" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/btn_showmore" android:textColor="@color/colorBlue" android:textSize="16sp" android:text="顯示更多" android:padding="0dp" /></LinearLayout> |
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//新建java類繼承自LinearLayoutpublic class ShowMoreTextView extends LinearLayout {// 用來標記是否為展開狀態 private int hideOrShow = 0; private TextView textView; private TextView button; public ShowMoreTextView(Context context) { super(context); } public ShowMoreTextView(Context context, AttributeSet attrs) { super(context, attrs);// 實例化layoutInflater對象，獲取到布局填充服務 LayoutInflater layoutInflater = (LayoutInflater)context. getSystemService(Context.LAYOUT_INFLATER_SERVICE);// 填充自定義的布局xml文件 layoutInflater.inflate(R.layout.showmore,this); textView = (TextView)findViewById(R.id.content); button=(TextView) findViewById(R.id.hide_show); button.setText("顯示更多");// 隱藏或顯示 hideOrShow(); }// 創建setContent方法為TextView填充內容 public void setContent(String content) { textView.setText(content); } public void hideOrShow() { button.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { //由hideOrShow的值確定按鈕和textview的狀態 if (hideOrShow == 0) { button.setText("收起"); textView.setMaxLines(100); hideOrShow = 2; }else if(hideOrShow==2){ button.setText("顯示更多"); textView.setMaxLines(3); hideOrShow = 1; }else if(hideOrShow==1){ button.setText("收起"); textView.setMaxLines(100); hideOrShow=2; } } }); }} |
接下來就可以引用了，與普通的控件一樣 activity_test.xml：
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<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.commy.activity.TestActivity"> <com.yunfeng.laojiahenan.view.ShowMoreTextView android:id="@+id/showmore" android:layout_width="match_parent" android:layout_height="wrap_content"/></RelativeLayout> |
測試類：
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public class TestActivity extends AppCompatActivity { private ShowMoreTextView showMoreTextView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_test); showMoreTextView=(ShowMoreTextView)findViewById(R.id.showmore); showMoreTextView.setContent(" There is so much life I've left to live And this fire's burning still When I watch you look at me I think I could find a way To stand for every dream And forsake this solid ground And give up this fear within Of what would happen if they end you I'm in love with you "); }} |
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：https://blog.csdn.net/CommyTin/article/details/51800835
