3つのステップでlistViewでネット画像を表示することを教えます
1.ネットワークから画像を取得する
2.ストリーム中のデータの読み出し
3.ListViewに表示
大成功!
/**
*
* @param path
* @return
* @throws Exception
*/
public static byte[] getImage(String path) throws Exception{
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(5 * 1000);
conn.setRequestMethod("GET");
InputStream inStream = conn.getInputStream();
if(conn.getResponseCode()==200){
return StreamTool.readStream(inStream);
}
return null;
}
2.ストリーム中のデータの読み出し
/**
*
* @param inStream
* @return
* @throws Exception
*/
public static byte[] readStream(InputStream inStream) throws Exception{
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
while( (len=inStream.read(buffer)) != -1){
outStream.write(buffer, 0, len);
}
outStream.close();
inStream.close();
return outStream.toByteArray();
}
3.ListViewに表示
public class MainActivity extends Activity {
private EditText pathText;
private ImageView imageView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
pathText = (EditText) this.findViewById(R.id.path);
imageView = (ImageView) this.findViewById(R.id.imageView);
Button button = (Button) this.findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
String path = pathText.getText().toString();
try {
byte[] data = ImageService.getImage(path);
if(data!=null){
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);//
imageView.setImageBitmap(bitmap);//
}else{
Toast.makeText(MainActivity.this, R.string.imageerror, 1).show();
}
} catch (Exception e) {
Toast.makeText(MainActivity.this, R.string.neterror, 1).show();
e.printStackTrace();
}
}
});
}
}
大成功!