本文主要是介绍【实验】ListView、bundle的使用，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
主要内容：
从跳转到另一个界面，并且可以返回。
图一 图二
xml:
item:
<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="horizontal"tools:context=".MainActivity" ><ImageView android:id="@+id/image"android:layout_width="50dp"android:layout_height="50dp"/><TextView android:id="@+id/name"android:layout_width="wrap_content"android:layout_height="wrap_content"/>
</LinearLayout>
activity_main:
<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" ><ListView android:id="@+id/list"android:layout_width="fill_parent"android:layout_height="wrap_content"></ListView></LinearLayout>
activity_main2:
<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" ><TextView android:id="@+id/tv"android:layout_gravity="center"android:layout_width="wrap_content"android:layout_height="wrap_content"/><Button android:id="@+id/btn"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center"android:text="back"/></LinearLayout>
第一种方法是使用SimpleAdapter：
package com.example.lab3;import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;public class MainActivity extends Activity {ListView list;private List<Map<String,Object>> mDataList = new ArrayList<Map<String,Object>>();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);init();setData(); //为mDataList添加元素//为ListView添加元素的适配器SimpleAdapter listItemAdapter = new SimpleAdapter(this,mDataList,R.layout.item,new String[]{"name","image"},new int[]{R.id.name,R.id.image});//ListView关联适配器list.setAdapter(listItemAdapter);//定义适配器的各个点击事件list.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {Bundle bundle = new Bundle();String fruitName ="";switch(arg2){case 0:fruitName = "apple";//bundle.putString("fruit", "apple");break;case 1:fruitName = "banana";//bundle.putString("fruit", "banana");//Toast.makeText(MainActivity.this, "1", Toast.LENGTH_LONG).show();break;case 2:fruitName = "cherry";//bundle.putString("fruit", "cherry");//Toast.makeText(MainActivity.this, "2", Toast.LENGTH_LONG).show();break;case 3:fruitName = "coco";break;case 4:fruitName = "kiwi";break;case 5:fruitName = "orange";break;case 6:fruitName = "pear";break;case 7:fruitName = "strawberry";break;case 8:fruitName = "watermelon";break;default:break;}bundle.putString("fruit", fruitName);Intent intent = new Intent(MainActivity.this, MainActivity2.class);intent.putExtras(bundle);startActivity(intent);}});}public void init(){list = (ListView)findViewById(R.id.list);}public void setData(){Map<String,Object> map = new HashMap<String,Object>();map.put("name", "Apple");map.put("image", R.drawable.apple);mDataList.add(map);map = new HashMap<String,Object>();map.put("name", "Banana");map.put("image", R.drawable.banana);mDataList.add(map);map = new HashMap<String,Object>();map.put("name", "Cherry");map.put("image", R.drawable.cherry);mDataList.add(map);map = new HashMap<String,Object>();map.put("name", "Coco");map.put("image", R.drawable.coco);mDataList.add(map);map = new HashMap<String,Object>();map.put("name", "Kiwi");map.put("image", R.drawable.kiwi);mDataList.add(map);map = new HashMap<String,Object>();map.put("name", "Orange");map.put("image", R.drawable.orange);mDataList.add(map);map = new HashMap<String,Object>();map.put("name", "Pear");map.put("image", R.drawable.pear);mDataList.add(map);map = new HashMap<String,Object>();map.put("name", "Strawberry");map.put("image", R.drawable.strawberry);mDataList.add(map);map = new HashMap<String,Object>();map.put("name", "Watermelon");map.put("image", R.drawable.watermelon);mDataList.add(map);}}/** * 1.init()位置* 2.break的使用；* * */
然后跳转到MainActivity2：
package com.example.lab3;import android.app.Activity;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;public class MainActivity2 extends Activity{TextView tv;Button btn;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main2);init();Bundle bundle = new Bundle();bundle = this.getIntent().getExtras();String fruit = bundle.getString("fruit"); //获取标签为fruit的内容tv.setText("I love " + fruit + "!!!");tv.setTextColor(Color.RED); //设置字体颜色btn.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stub//Intent intent_back = new Intent(MainActivity2.this, MainActivity.class);//startActivity(intent_back);finish(); //finish()可以避免了上述方法中新建一个activity的冗赘}});}public void init(){tv = (TextView)findViewById(R.id.tv);btn = (Button)findViewById(R.id.btn);}
}
或者是自定义一个FruitAdapter方法。
首先是Fruit一个类的定义：
/** 定义一个Fruit类，封装name和image*/
package com.example.lab3;public class Fruit {private String name;private int imageId;public Fruit(String name,int imageId){this.name = name;this.imageId = imageId;}public String getName(){return name;}public int getImageId(){return imageId;}}
然后自定义适配器：
/** 自定义一个适配器*/
package com.example.lab3;import java.util.List;import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;public class FruitAdapter extends ArrayAdapter<Fruit> {private int resourceId;public FruitAdapter(Context context, int textViewResourceId,List<Fruit> fruits) {super(context, textViewResourceId, fruits);// TODO Auto-generated constructor stubresourceId = textViewResourceId;}@Overridepublic View getView(int position,View convertView,ViewGroup parent){Fruit fruit = getItem(position);View view = LayoutInflater.from(this.getContext()).inflate(resourceId,null);ImageView fruitImage = (ImageView)view.findViewById(R.id.image); TextView fruitName = (TextView)view.findViewById(R.id.name);fruitImage.setImageResource(fruit.getImageId());fruitName.setText(fruit.getName());return view;}}
最后是MainActivity3：
package com.example.lab3;import java.util.ArrayList;
import java.util.List;import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.ListView;public class MainActivity3 extends Activity {private List<Fruit> fruitList = new ArrayList<Fruit>();ListView list;FruitAdapter adapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);fruitList.add(new Fruit("apple",R.drawable.apple));fruitList.add(new Fruit("banana",R.drawable.banana));fruitList.add(new Fruit("cherry",R.drawable.cherry));fruitList.add(new Fruit("coco",R.drawable.coco));fruitList.add(new Fruit("kiwi",R.drawable.kiwi));fruitList.add(new Fruit("orange",R.drawable.orange));fruitList.add(new Fruit("pear",R.drawable.pear));fruitList.add(new Fruit("strawberry",R.drawable.strawberry));fruitList.add(new Fruit("watermelon",R.drawable.watermelon));adapter = new FruitAdapter(MainActivity3.this, R.layout.item, fruitList);list = (ListView)findViewById(R.id.list);//ListView关联适配器list.setAdapter(adapter);list.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {// TODO Auto-generated method stubBundle bundle = new Bundle();String fruitName ="";switch(arg2){case 0:fruitName = "apple";//bundle.putString("fruit", "apple");break;case 1:fruitName = "banana";//bundle.putString("fruit", "banana");//Toast.makeText(MainActivity.this, "1", Toast.LENGTH_LONG).show();break;case 2:fruitName = "cherry";//bundle.putString("fruit", "cherry");//Toast.makeText(MainActivity.this, "2", Toast.LENGTH_LONG).show();break;case 3:fruitName = "coco";break;case 4:fruitName = "kiwi";break;case 5:fruitName = "orange";break;case 6:fruitName = "pear";break;case 7:fruitName = "strawberry";break;case 8:fruitName = "watermelon";break;default:break;}bundle.putString("fruit", fruitName);Intent intent = new Intent(MainActivity3.this, MainActivity2.class);intent.putExtras(bundle);startActivity(intent);}});list.setOnItemLongClickListener(new OnItemLongClickListener() {@Overridepublic boolean onItemLongClick(AdapterView<?> arg0, View arg1,int arg2, long arg3) {// TODO Auto-generated method stubfruitList.remove(arg2);list.setAdapter(adapter);return false;}});}
}
注：两种方法共用了MainActivity2的界面，以后还是第二种方法比较常见。
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