1. MainActivity代码:
import java.io.IOException;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
public class ImageActivity extends Activity {
private Button myButton = null;
private ImageView imageView = null;
private static final String image_path = "http://11.203.18.14:8080/source/001.png";
private ProgressDialog dialog = null;
private Handler handler = new Handler();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
myButton = (Button)findViewById(R.id.myButton);
imageView = (ImageView)findViewById(R.id.imageView);
dialog = new ProgressDialog(ImageActivity.this);
dialog.setTitle("提示");
dialog.setMessage("正在下载,请稍后......");
dialog.setCancelable(false);
myButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
new Thread(new MyThread()).start();
dialog.show();
}
});
}
public class MyThread implements Runnable {
@Override
public void run() {
// TODO Auto-generated method stub
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(image_path);
HttpResponse httpResponse = null;
try {
httpResponse = httpClient.execute(httpGet);
if(httpResponse.getStatusLine().getStatusCode()==200){
byte[] data = EntityUtils.toByteArray(httpResponse.getEntity());
final Bitmap bmp = BitmapFactory.decodeByteArray(data, 0, data.length);
handler.post(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
imageView.setImageBitmap(bmp);
}
});
dialog.dismiss();
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.image, menu);
return true;
}
}
2. main.xml代码
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<Button
android:id="@+id/myButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="下载"/>
<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"/>
</LinearLayout>
3. 注册网络访问权限
<uses-permission android:name="android.permission.INTERNET"/>