老师您imageview那个例子中HttoThread.java写的是不是有些小问题呀，我运行后是空白，后来是这么解决的
53行改为String fileName = String.valueOf(System.currentTimeMillis())+".jpg";//您没有指定后缀
59行加上if (!downloadFile.exists()) downloadFile.createNewFile();//您没有新创建文件，不能写入数据
为什么您的代码没有这两行可以运行。。。。卡我三天才解决，希望知道自己是不是哪儿漏写了。。。
2016-08-05
package com.bmiehis.httpurlconnection;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Environment;import android.os.Handler;import android.util.Log;import android.widget.ImageView;import org.json.JSONObject;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;/** * Created by dell on 2016/8/2. */public class HttpImageThread extends Thread {
private String url;
private Handler handler;
private ImageView imageView;
public HttpImageThread(String url, ImageView imageView, Handler handler) {
this.url = url;
this.handler = handler;
this.imageView = imageView;
}
@Override
public void run() {
try {
URL httpUrl = new URL(url);
InputStream in;
/* if(url.contains("https://")) { HttpsURLConnection conn= (HttpsURLConnection) httpUrl.openConnection(); conn.setReadTimeout(5000); conn.setRequestMethod("GET"); conn.setDoInput(true); in=conn.getInputStream(); } else */
{
HttpURLConnection conn = (HttpURLConnection) httpUrl.openConnection();
conn.setReadTimeout(5000);
conn.setRequestMethod("GET");
conn.setDoInput(true);
in = conn.getInputStream();
}
FileOutputStream out = null;
String fileName = String.valueOf(System.currentTimeMillis())+".jpg";
File downloadFile = null;
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
File parent = Environment.getExternalStorageDirectory();
downloadFile = new File(parent, fileName);
if (!downloadFile.exists()) downloadFile.createNewFile();
out = new FileOutputStream(downloadFile);
Log.d(HttpImageThread.class.getSimpleName(), "++++++++++++++++getExternalStorageState_success!");
}
byte[] b = new byte[2 * 1024];
int len;
if (out != null) {
while ((len = in.read(b)) != -1) {
out.write(b, 0, len);
}
}
final Bitmap bitmap = BitmapFactory.decodeFile(downloadFile.getAbsolutePath());
Log.d(HttpImageThread.class.getSimpleName(), "++++++++++++++++++++++++downloadFile_success");
handler.post(new Runnable() {
@Override
public void run() {
imageView.setImageBitmap(bitmap);
Log.d(HttpImageThread.class.getSimpleName(), "++++++++++++++++++++++++setImageBitmap_success");
}
});
} catch (IOException e) {
e.printStackTrace();
}
}}举报
