Android学习第九天----Multiple_choice
单选跟多选的差别在于其中一个元素的不同而已,先看以下的代码:
xml
<LinearLayout 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:orientation="vertical" tools:context=".MainActivity" > <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="get value" /> <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="TextView" /> <ListView android:id="@+id/listView1" android:layout_width="match_parent" android:layout_height="wrap_content" > </ListView> </LinearLayout>
自己创建的xml文件:
<?xml version="1.0" encoding="utf-8"?> <CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/checkedTextView1" android:layout_width="match_parent" android:layout_height="wrap_content" android:checkMark="?android:attr/listChoiceIndicatorMultiple" />
java代码:
package com.will.test; import java.util.HashSet; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.ListView; import android.widget.TextView; public class MainActivity extends Activity implements OnItemClickListener, OnClickListener { private Button mBut = null; private ListView mListView = null; private TextView mTextView = null; private String mValue = null; private HashSet set; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mBut = (Button) findViewById(R.id.button1); mListView = (ListView) findViewById(R.id.listView1); mTextView = (TextView) findViewById(R.id.textView1); String[] address ={ "aaaa", "bbbb", "cccc" }; set = new HashSet(); mBut.setOnClickListener(this); mListView.setAdapter(new ArrayAdapter(this, R.layout.activity_main_lv,address)); mListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE); mListView.setOnItemClickListener(this); } @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { mValue = mListView.getItemAtPosition(arg2).toString(); if(!set.contains(mValue)) { set.add(mValue); } else { set.remove(mValue); } } @Override public void onClick(View v) { mTextView.setText(set.toString()); } }
将它的值传给集合中,然后通过对集合的操作来完成多重选择的输出。