public class MainActivity extends Activity {
private TextView result;
private ItemAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 创建请求队列
// volley可以下载网页、图片、json
final RequestQueue queue = Volley.newRequestQueue(MainActivity.this);
result = (TextView) findViewById(R.id.downloadresult);
// 创建请求
String url = "http://192.168.48.104/h.txt";
// 参数 1——url 2——下载成功相应 3——下载失败响应
StringRequest stringRequest = new StringRequest(url,
new Response.Listener<String>() {
// 下载完成，回调
@Override
public void onResponse(String response) {
// TODO Auto-generated method stub
System.out.println("=================" + response);
result.setText(response);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
// TODO Auto-generated method stub
System.out.println("=================下载失败");
result.setText("网页下载失败");
}
});
// 添加请求到请求队列
// queue.add(stringRequest);
// 二、下载图片
// 参数 1——图片URL 2——下载成功响应 3——图片宽度 4——图片高度（0为原高）5——下载失败响应
String imagUrl = "http://b.hiphotos.baidu.com/image/pic/item/b219ebc4b74543a9030fb57e1d178a82b901146f.jpg";
ImageRequest imageRequest = new ImageRequest(imagUrl,
new Response.Listener<Bitmap>() {
@Override
public void onResponse(Bitmap response) {
// TODO Auto-generated method stub
ImageView img = (ImageView) findViewById(R.id.img);
img.setImageBitmap(response);
result.setText("图片下载成功！");
}
}, 0, 0, Config.ARGB_8888, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
// TODO Auto-generated method stub
result.setText("图片下载失败！");
}
});
// queue.add(imageRequest);
// 下载json
// String jsonUrl = "http://bcs.duapp.com/openclass/images%2Fdata.json";
String jsonUrl = "http://121.42.13.103/cyberHotel/1.txt";
JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(jsonUrl,
new Response.Listener<JSONArray>() {
private String name;
private String image;
@Override
public void onResponse(JSONArray response) {
// TODO Auto-generated method stub
// 解析Json
ArrayList<ItemData> data = new ArrayList<ItemData>();
for (int i = 0; i < response.length(); i++) {
try {
JSONObject jsonObject = response
.getJSONObject(i);
name = jsonObject.getString("name");
image = jsonObject.getString("image");
// 封装name image
ItemData item = new ItemData(name, image);
data.add(item);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
ListView list = (ListView) findViewById(R.id.list);
result.setText("Json解析成功");
adapter = new ItemAdapter(MainActivity.this, data,queue);
list.setAdapter(adapter);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
// TODO Auto-generated method stub
}
});
queue.add(jsonArrayRequest);
}
}
public class ItemAdapter extends BaseAdapter {
Context context;
ArrayList<ItemData> data;
LayoutInflater inflater;
private ImageLoader imageLoader;
public ItemAdapter(Context context, ArrayList<ItemData> data,RequestQueue queue) {
super();
this.context = context;
this.data = data;
inflater = inflater.from(context);
imageLoader=new ImageLoader(queue, new ImageCache() {
//存图片
@Override
public void putBitmap(String url, Bitmap bitmap) {
// TODO Auto-generated method stub
File cacheDir = ItemAdapter.this.context.getExternalCacheDir();
String fileName=getFileName(url);
//缓存文件
File file = new File(cacheDir,fileName);
try {
FileOutputStream out = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
try {
out.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public String getFileName(String url){
String[] split = url.split("/");
return split[split.length-1];
}
//取图片
@Override
public Bitmap getBitmap(String url) {
// TODO Auto-generated method stub
File cacheDir = ItemAdapter.this.context.getExternalCacheDir();
String fileName = getFileName(url);
File file = new File(cacheDir,fileName);
//判断文件是否存在
if(file.exists()){
return BitmapFactory.decodeFile(file.getPath());
}
return null;
}
});
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return data.size();
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int position, View arg1, ViewGroup arg2) {
// TODO Auto-generated method stub
LinearLayout layout = (LinearLayout) inflater.inflate(
R.layout.listitem, null);
TextView name = (TextView) layout.findViewById(R.id.item_text);
NetworkImageView image = (NetworkImageView) layout.findViewById(R.id.item_image);
name.setText(data.get(position).getName().toString());
System.out.println("======================"+position);
image.setDefaultImageResId(R.drawable.ic_launcher);
//设置图片
image.setImageUrl(data.get(position).getImage(), imageLoader);
return layout;
}
}
public class ItemData {
public ItemData() {
super();
}
public ItemData(String name, String image) {
super();
this.name = name;
this.image = image;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}
private String name;
private String image;
}
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<TextView
android:id="@+id/downloadresult"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<ImageView
android:id="@+id/img"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<ListView
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
></ListView>
</LinearLayout>
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" >
<com.android.volley.toolbox.NetworkImageView
android:id="@+id/item_image"
android:layout_width="100dp"
android:layout_height="100dp"
android:src="@drawable/ic_launcher"
/>
<TextView
android:id="@+id/item_text"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:gravity="center_vertical"
android:layout_marginLeft="20dp"
/>
</LinearLayout>
