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package com.xh.tx.images;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import com.loopj.android.image.SmartImage;
import com.loopj.android.image.SmartImageView;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener{
protected static final String TAG = "MainActivity";
SmartImageView image = null;
EditText edit = null;
/* Handler handler = new Handler(){
//接收一个消息
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if(msg.what == 1)
{
Bitmap bitmap = (Bitmap) msg.obj;
image.setImageBitmap(bitmap);
}
}
};*/
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
image = (SmartImageView) findViewById(R.id.img);
edit = (EditText) findViewById(R.id.et_net);
Button button = (Button) findViewById(R.id.bt_get);
button.setOnClickListener(this);
}
/**
* 1.访问网络不能直接放在主方法里面(android.os.NetworkOnMainThreadException),应该放在一个线程里面
* 2. android.view.ViewRootImpl$CalledFromWrongThreadException: 只能在主线程或者UI线程里面修改视图,应该用通信来解决
*
*/
@Override
public void onClick(View v)
{
String uri = edit.getText().toString();
image.setImageURI(Uri.parse(uri));
/*final String uri = edit.getText().toString(); //拿到图片的网络地址
new Thread(new Runnable() {
@Override
public void run() {
Bitmap bitmap = getImageFromNet(uri);
if(null != bitmap)
{
Message msg = new Message();
msg.what = 1; //你是谁
msg.obj = bitmap;
handler.sendMessage(msg); //发送一个消息
//image.setImageBitmap(bitmap);
Log.i(TAG, "========" + bitmap);
}else
{
//Toast.makeText(MainActivity.this, "获取图片失败", 0).show();
}
}
}).start();
*/
}
//返回的不是image了 返回的是bitmap >> 位图
public Bitmap getImageFromNet(String uri)
{
HttpURLConnection conn = null;
try {
//1.首先将地址转换为Uri
//Uri net_uri = Uri.parse(uri); //这种方式是错误的
URL url = new URL(uri);
//2. 获取网络连接
conn = (HttpURLConnection) url.openConnection(); //这个地方要转换一次,转换为你获取图片的协议连接
//3. 设置请求的一些常用的参数
conn.setConnectTimeout(30000);//设置超时
conn.setDoInput(true); //设置请求可以放服务器写入数据
conn.setReadTimeout(30000); //设置连接去读取数据的超时时间
//4.真正请求图片,然后把从网络上请求到的二进制流保存到了inputStream里面
conn.connect();
InputStream in = conn.getInputStream();
Bitmap bitmap = BitmapFactory.decodeStream(in); //BitMap的图片工厂,创建出一个图片
return bitmap;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally
{
//5. 关闭连接
if(null != conn)
{
conn.disconnect();
}
}
return null;
}
}
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原文地址:http://www.cnblogs.com/wt-w/p/4922987.html