本文主要是介绍ListView中混合使用Drawable文件夹资源和网络资源,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!
1、listview.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:background="#FFFFFF">
<ImageView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/image"
android:src="@drawable/icon_1"
android:visibility="gone"></ImageView>
<ListView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/listview"></ListView>
</LinearLayout>
2、listitem.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:id="@+id/img"
/>
<TextView android:id="@+id/listtext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#000000"
android:textSize="18dip" ></TextView>
</LinearLayout>
3、
package moile.drawable.main;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
public class ListViewActivity extends Activity {
private ImageView imageView ;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.listview);
imageView = (ImageView)this.findViewById(R.id.image); //放置该ImageView是为了能够设置ListView中图片的大小
byte[] data = null;//1、使用Bitmap的方式
try {
data = this.getImage("http://online.sccnn.com/icon/1202/01.png");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}//得到图片的二进制数据
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);//生成位图
ListView listView = (ListView)this.findViewById(R.id.listview);
List<HashMap<String, Object>> list = new ArrayList<HashMap<String, Object>>();
HashMap<String, Object> map = new HashMap<String, Object>();
map.put("ItemImg",R.drawable.icon);
map.put("ItemTitle", "第一行");
list.add(map);
map = new HashMap<String, Object>();
map.put("ItemImg",R.drawable.icon_1);
map.put("ItemTitle", "第二行");
list.add(map);
map = new HashMap<String, Object>(); //1、使用Bitmap的方式
map.put("ItemImg",bitmap);
map.put("ItemTitle", "我的Test");
list.add(map);
SimpleAdapter m = new SimpleAdapter(this,list,R.layout.listitem,
new String[]{"ItemImg","ItemTitle"},
new int[]{R.id.img,R.id.listtext});
listView.setAdapter(m);
m.setViewBinder(new SimpleAdapter.ViewBinder() {
@Override
public boolean setViewValue(View view, Object data,
String textRepresentation) {
// TODO Auto-generated method stub
if(view instanceof ImageView && data instanceof Bitmap){ //1、使用Bitmap的方式
ImageView iv = (ImageView) view;
Bitmap bitmap = (Bitmap) data;
Bitmap b = Bitmap.createScaledBitmap(bitmap, imageView.getDrawable().getIntrinsicWidth(), imageView.getDrawable().getIntrinsicHeight(), true);//创建一个可以缩放的位图对象
iv.setImageBitmap(b);
return true;
}else
return false;
}
});
}
public byte[] getImage(String path) throws Exception{
URL url = new URL(path);
//get //post
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5*1000);
InputStream inStream = conn.getInputStream();
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
while( (len = inStream.read(buffer)) !=-1 ){
outStream.write(buffer, 0, len);
}
byte[] data = outStream.toByteArray();//图片的二进制数据
outStream.close();
inStream.close();
return data;
}
}
这篇关于ListView中混合使用Drawable文件夹资源和网络资源的文章就介绍到这儿,希望我们推荐的文章对编程师们有所帮助!