Android显示在线图片

最新推荐文章于 2022-10-13 15:20:43 发布

liuhanhan512

最新推荐文章于 2022-10-13 15:20:43 发布

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文章标签： android buffer byte path button null

本文介绍如何使用Android应用从网络获取图片，并通过Java代码实现图片的加载与显示。主要内容包括设置网络请求、读取网络流、解码图片为Bitmap格式以及处理异常情况，确保应用能够成功展示图片。

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转自：http://blog.youkuaiyun.com/ameyume/article/details/6106286

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import java.io.ByteArrayOutputStream;
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.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
public class AndroidTest extends Activity {
private static final String URL = "http://avatar.youkuaiyun.com/3/2/4/2_ameyume.jpg";
private EditText pathText;
private ImageView imageView;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
pathText = (EditText) this.findViewById(R.id.path);
pathText.setText(URL);
imageView = (ImageView) this.findViewById(R.id.imageView);
Button button = (Button) this.findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
String path = pathText.getText().toString();
try {
byte[] data = getImage(path);
if(data!=null){
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);// bitmap
imageView.setImageBitmap(bitmap);// display image
}else{
Toast.makeText(AndroidTest.this, "Image error!", 1).show();
}
} catch (Exception e) {
Toast.makeText(AndroidTest.this,"Newwork error!", 1).show();
e.printStackTrace();
}
}
});
}
/**
* Get image from newwork
* @param path The path of image
* @return
* @throws Exception
*/
public static byte[] getImage(String path) throws Exception{
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(5 * 1000);
conn.setRequestMethod("GET");
InputStream inStream = conn.getInputStream();
if(conn.getResponseCode()==200){
return readStream(inStream);
}
return null;
}
/**
* Get data from stream
* @param inStream
* @return
* @throws Exception
*/
public static byte[] readStream(InputStream inStream) throws Exception{
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
while( (len=inStream.read(buffer)) != -1){
outStream.write(buffer, 0, len);
}
outStream.close();
inStream.close();
return outStream.toByteArray();
}
}