网络图片查看器

package com.example.imagebrowser

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity {
private EditText editText;
private ImageView imageView;
private static final int SHOW_IMAGE = 1;
private Handler handler = new Handler() {
public void handleMessage(android.os.Message msg) {
switch (msg.what) {
case SHOW_IMAGE:
Bitmap bitmap = (Bitmap) msg.obj;
imageView.setImageBitmap(bitmap);
break;
default:
break;
}
};
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editText = (EditText) findViewById(R.id.editText);
imageView = (ImageView) findViewById(R.id.imageView);
}

public void showImage(View view) {
final String path = editText.getText().toString();
if (TextUtils.isEmpty(path)) {
Toast.makeText(this, "图片不能为空", Toast.LENGTH_LONG).show();
} else {
new Thread() {
public void run() {
try {
URL url = new URL(path);
HttpURLConnection httpURLConnection = (HttpURLConnection) url
.openConnection();
httpURLConnection.setRequestMethod("GET");
httpURLConnection.setConnectTimeout(5000);
int responsecode = httpURLConnection.getResponseCode();
if (responsecode == 200) {
InputStream is = httpURLConnection.getInputStream();
Bitmap bitmap = BitmapFactory.decodeStream(is);
Message msg = new Message();
msg.what = SHOW_IMAGE;
msg.obj = bitmap;
handler.sendMessage(msg);
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
};
}.start();
}
}
}

<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"
tools:context=".MainActivity" >

<ImageView
android:id="@+id/imageView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1" />

<EditText
android:id="@+id/editText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:text="http://pica.nipic.com/2007-11-09/2007119121849495_2.jpg" />

<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:onClick="showImage"
android:text="浏览" />

</LinearLayout>