1 布局文件，
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >
<ImageView
android:id="@+id/iv_icon"
android:layout_width="fill_parent"
android:layout_height="0dip"
android:layout_weight="1" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<EditText
android:id="@+id/et_url"
android:layout_width="0dip"
android:text="http://img0.hao123.com/data/1_489a5f7dfbcbb624a231f372e4bdffce_310"
android:layout_height="wrap_content"
android:singleLine="true"
android:layout_weight="1" />
<Button
android:id="@+id/btn_submit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Go"
android:textSize="20sp" />
</LinearLayout>
</LinearLayout>
Android代码（Handler的运用），HttpURLConnection的应用，将url图片地址转换成图片。
package com.itheim28.submitdata;
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.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener {
private static final String TAG = "MainActivity";
protected static final int ERROR = 1;
private EditText etUrl;
private ImageView ivIcon;
private final int SUCCESS = 0;
private Handler handler = new Handler() {
public void handleMessage(Message msg) {
super.handleMessage(msg);
Log.i(TAG, "what = " + msg.what);
if (msg.what == SUCCESS) {
ivIcon.setImageBitmap((Bitmap)msg.obj);
} else if (msg.what == ERROR) {
Toast.makeText(MainActivity.this, "抓起失败", 0).show();
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ivIcon = (ImageView) findViewById(R.id.iv_icon);
etUrl = (EditText) findViewById(R.id.et_url);
findViewById(R.id.btn_submit).setOnClickListener(this);
}
@Override
public void onClick(View v) {
final String url = etUrl.getText().toString();
new Thread(new Runnable() {
@Override
public void run() {
Bitmap bitmap = getImageFromNet(url);
// ivIcon.setImageBitmap(bitmap); // 设置imageView显示的图片
if(bitmap != null) {
Message msg = new Message();
msg.what = SUCCESS;
msg.obj = bitmap;
handler.sendMessage(msg);
} else {
Message msg = new Message();
msg.what = ERROR;
handler.sendMessage(msg);
}
}}).start();
}
/**
* 根据url连接取网络抓去图片返回
* @param url
* @return url对应的图片
*/
private Bitmap getImageFromNet(String url) {
HttpURLConnection conn = null;
try {
URL mURL = new URL(url); // 创建一个url对象
// 得到http的连接对象
conn = (HttpURLConnection) mURL.openConnection();
conn.setRequestMethod("GET"); // 设置请求方法为Get
conn.setConnectTimeout(10000); // 设置连接服务器的超时时间, 如果超过10秒钟, 没有连接成功, 会抛异常
conn.setReadTimeout(5000); // 设置读取数据时超时时间, 如果超过5秒, 抛异常
conn.connect(); // 开始链接
int responseCode = conn.getResponseCode(); // 得到服务器的响应码
if(responseCode == 200) {
// 访问成功
InputStream is = conn.getInputStream(); // 获得服务器返回的流数据
Bitmap bitmap = BitmapFactory.decodeStream(is); // 根据 流数据 创建一个bitmap位图对象
return bitmap;
} else {
Log.i(TAG, "访问失败: responseCode = " + responseCode);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if(conn != null) {
conn.disconnect(); // 断开连接
}
}
return null;
}
}
