android应用开发之HttpConnection

HttpConnectionActivity.java

package cn.sanbo.test;import java.io.InputStream;import java.net.HttpURLConnection;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.view.View;import android.view.View.OnClickListener;import android.widget.EditText;import android.widget.ImageView;import android.widget.TextView;import android.widget.Toast;public class HttpConnectionActivity extends Activity implements OnClickListener {private TextView textView;private ImageView iv_bitmap;private boolean isLoad = false;private EditText et;private Handler handler = new Handler() {public void handleMessage(Message msg) {super.handleMessage(msg);switch (msg.what) {case 1:Bitmap bitmap = (Bitmap) msg.obj;iv_bitmap.setVisibility(View.VISIBLE);iv_bitmap.setImageBitmap(bitmap);break;case 2:isLoad = false ;Toast.makeText(getApplicationContext(), "图片加载失败!", 0).show();break;default:break;}};};public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);init();}private void init() {this.findViewById(R.id.button).setOnClickListener(this);textView = (TextView) this.findViewById(R.id.textView);iv_bitmap = (ImageView) this.findViewById(R.id.iv_bitmap);et = (EditText) this.findViewById(R.id.et_url);}public void onClick(View v) {if (v.getId() == R.id.button) {if (!isLoad) {isLoad = true;textView.setVisibility(View.VISIBLE);new MyThead().start();textView.setVisibility(View.GONE);} else {Toast.makeText(HttpConnectionActivity.this, "图片不需要重复加载", 0).show();}}}class MyThead extends Thread {public void run() {super.run();String strUrl = et.getText().toString();Message msg = new Message();try {URL url = new URL(strUrl);HttpURLConnection connection = (HttpURLConnection) url.openConnection();int code = connection.getResponseCode();if (code == HttpURLConnection.HTTP_OK) {InputStream is = connection.getInputStream();Bitmap bitmap = BitmapFactory.decodeStream(is);msg.what = 1;msg.obj = bitmap;handler.sendMessage(msg);}} catch (Exception e) {e.printStackTrace();msg.what = 2;handler.sendMessage(msg);}}}}

main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <EditText        android:id="@+id/et_url"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="http://g.hiphotos.baidu.com/pic/w%3D230/sign=a703c2f077094b36db921cee93cd7c00/5fdf8db1cb1349549f8dd44b574e9258d1094a09.jpg" />    <Button        android:id="@+id/button"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="httpconnention" />    <TextView        android:id="@+id/textView"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="加载图片"        android:textColor="@android:color/white"        android:textSize="18dip"        android:visibility="gone" />    <ImageView        android:id="@+id/iv_bitmap"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:scaleType="fitCenter"        android:visibility="gone" /></LinearLayout>