在做Android开发的时候,会遇到动态添加标签让用户选择的功能,所以自己写了个例子,运行效果图如下。
标签可以左右滑动进行选择,点击的时候,会弹出toast提示选择或者取消选择了哪个标签。通过动态添加TextView作为标签,并给TextView设置背景,通过selector选择器改变其背景颜色,来确定是否处于选中状态。
代码如下所示:
1、标签的布局文件,我在标签里只设置了一个TextView
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<? xml version = "1.0" encoding = "utf-8" ?> < LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" android:layout_width = "match_parent" android:layout_height = "match_parent" android:orientation = "vertical" > < TextView android:id = "@+id/textView1" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:layout_margin = "10dp" android:background = "@drawable/mark_select" android:enabled = "false" android:padding = "10dp" android:text = "TextView" /> </ LinearLayout > |
2、在res文件夹下新建drawable文件夹,标签的背景设为@drawable/mark_select,代码如下所示:
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<? xml version = "1.0" encoding = "utf-8" ?> < selector xmlns:android = "http://schemas.android.com/apk/res/android" > < item android:drawable = "@drawable/mark_notbeselected" android:state_enabled = "false" /> < item android:drawable = "@drawable/mark_beselected" android:state_enabled = "true" /> </ selector > |
当标签处于选中状态,背景为@drawable/mark_beselected,当标签处于未选中状态,背景为@drawable/mark_notbeselected
其中mark_notbeselected代码为:
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<? xml version = "1.0" encoding = "utf-8" ?> < shape xmlns:android = "http://schemas.android.com/apk/res/android" > < solid android:color = "#ffffff" /> < corners android:radius = "3dip" /> < stroke android:width = "1dip" android:color = "#1cb0ba" /> </ shape > |
mark_beselected代码为:
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<? xml version = "1.0" encoding = "utf-8" ?> < shape xmlns:android = "http://schemas.android.com/apk/res/android" > < solid android:color = "#1cb0ba" /> < corners android:radius = "3dip" /> < stroke android:width = "1dip" android:color = "#1cb0ba" /> </ shape > |
3、主页面布局文件里包括一个水平滚动条HorizontalScrollView,代码如下:
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< LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" android:layout_width = "fill_parent" android:layout_height = "fill_parent" android:orientation = "vertical" > < HorizontalScrollView android:id = "@+id/horizontalScrollView1" android:layout_width = "match_parent" android:layout_height = "wrap_content" > < LinearLayout android:id = "@+id/linearLayout1" android:layout_width = "match_parent" android:layout_height = "match_parent" android:orientation = "horizontal" > </ LinearLayout > </ HorizontalScrollView > </ LinearLayout > |
4、MainActivity.java代码如下所示:
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public class MainActivity extends Activity { List<String> list; private LinearLayout linearLayout; @Override protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout.activity_main); linearLayout = (LinearLayout) findViewById(R.id.linearLayout1); //添加标签内容 list = new ArrayList<String>(); for ( int i = 0 ; i < 10 ; i++) { String str = "标签" + i; list.add(str); } //初始化标签 initMarksView(); } private void initMarksView() { for ( int i = 0 ; i < list.size(); i++) { View view = View.inflate(MainActivity. this , R.layout.mark_layout, null ); TextView tv = (TextView) view.findViewById(R.id.textView1); tv.setText(list.get(i)); tv.setTag(i); view.setTag( false ); // 设置view的点击事件,与onClick中的View一致 //否则需要在onClick中,去findViewById,找出设置点击事件的控件进行操作 //若不如此,则无法触发点击事件 view.setOnClickListener( new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub TextView tv = (TextView) v.findViewById(R.id.textView1); Log.i( "dxl" , "TextView click" ); if ((Boolean) v.getTag()) { v.setTag( false ); tv.setEnabled( false ); Toast.makeText(MainActivity. this , "你取消了选择标签" + tv.getTag(), Toast.LENGTH_SHORT).show(); } else { v.setTag( true ); tv.setEnabled( true ); Toast.makeText(MainActivity. this , "你选择了标签" + tv.getTag(), Toast.LENGTH_SHORT).show(); } } }); linearLayout.addView(view); } } } |
至此,便实现了动态添加表情,并可以处理标签点击事件的功能。
源代码下载:Android动态添加标签及其点击事件
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/ddxxll2008/article/details/49338179