android=》下载图片

最新推荐文章于 2024-08-08 15:37:45 发布

原创最新推荐文章于 2024-08-08 15:37:45 发布 · 460 阅读

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#android下载图片

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本文演示了如何使用Java创建一个Activity来从网络下载图片并保存到SD卡上。

public class C6Demo01_DownImageActivity extends Activity {
/** Called when the activity is first created. */
private Button btn;
private ImageView iv;
private URL url;
private InputStream input;
private FileOutputStream output;
private File path;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn=(Button) findViewById(R.id.btn);
iv=(ImageView) findViewById(R.id.iv);
btn.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
try {
url=new URL("http://wenwen.soso.com/p/20110724/20110724161153-1243191028.jpg");
input=url.openStream();
System.out.println("input="+input);
Bitmap bitmap=BitmapFactory.decodeStream(input);
iv.setImageBitmap(bitmap);

input.close();
// writeTosdCard();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}
});

}
public void writeTosdCard(){
path=new File(Environment.getExternalStorageDirectory()+"/images");
if(!path.exists()){
path.mkdirs();
}
File file=new File(path+"/image.jpg");
try {
output=new FileOutputStream(file);
input=url.openStream();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

byte[] buffer=new byte[1024];
int t;
try {
while((t=input.read(buffer))!=-1){
output.write(buffer,0,t);
input.close();
output.close();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

}