Android关于ListView显示SD卡上的Bitmap的图片（图片压缩之后）

ＪＡＶＡ文件如下

package com.lostinai;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.BitmapFactory.Options;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.AdapterView;import android.widget.ImageView;import android.widget.ListView;import android.widget.SimpleAdapter;import android.widget.AdapterView.OnItemClickListener;import android.widget.SimpleAdapter.ViewBinder;public class ListviewtutuActivity extends Activity {private ListView lv;public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.home);lv = (ListView)findViewById(R.id.h_list_view);setViews();lv.setOnItemClickListener(new OnItemClickListener(){public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {Log.e("lostinai","lostinai");}});}private void setViews() {SimpleAdapter adapter = new SimpleAdapter(this, getDatas() ,R.layout.message_list, new String[]{"icon","title","shortContent"}, new int[]{R.id.ml_icon,R.id.ml_title,R.id.ml_short_content});lv.setAdapter(adapter);adapter.setViewBinder(new ViewBinder() {              public boolean setViewValue(View arg0, Object arg1,                      String textRepresentation) {                  if ((arg0 instanceof ImageView) & (arg1 instanceof Bitmap)) {                      ImageView imageView = (ImageView) arg0;                      Bitmap bitmap = (Bitmap) arg1;                      imageView.setImageBitmap(bitmap);                      return true;                  } else {                      return false;                  }              }          });  }private List<Map<String,Object>> getDatas() {List<Map<String,Object>> list = new ArrayList<Map<String,Object>>();for (int i=1; i<=12; i++) {Map<String,Object> map = new HashMap<String,Object>(); String imagePath = "/sdcard/"+2+".jpg";  // 图片压缩Bitmap bm = null;Options op = new Options();op.inSampleSize = 5; op.inJustDecodeBounds = false;bm = BitmapFactory.decodeFile(imagePath, op);map.put("icon",bm);map.put("title", "My Title "+i);map.put("shortContent", "my short content "+i);list.add(map);}return list;}}

home.xml文件如下

<?xml version="1.0" encoding="utf-8"?><ListView     xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/h_list_view"  android:layout_width="fill_parent"  android:layout_height="fill_parent"/>

message_list.xml如下

<?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"><ImageView android:id="@+id/ml_icon"android:layout_width="50dp"android:layout_height="58dp"android:src="@drawable/ic_launcher"/><LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"  android:orientation="vertical"  android:layout_width="wrap_content"  android:layout_height="58dp"  android:layout_weight="1">  <TextView android:id="@+id/ml_title"  android:layout_width="fill_parent"  android:layout_height="25dp"  android:textStyle="bold"  android:textSize="20dp"  />  <TextView android:id="@+id/ml_short_content"  android:layout_width="fill_parent"  android:layout_height="35dp"  /></LinearLayout><TextViewandroid:layout_width="30dp"android:layout_height="58dp"android:text=">"android:textSize="26dp"android:layout_gravity="right"android:gravity="center"/></LinearLayout>

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