Tải hình từ Internet vào Android sử dụng Async Task

ltnghia1304 · September 17, 2021, 11:17am

Mọi người xem giúp em vì sao em tải hình từ internet dùng Async Task mà lại không chạy được ạ?
Máy không báo error, chỉ khi chạy thì màn hình nói là Async không chạy được.
Code của em:

package com.example.lenghia.asyn;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ImageView;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;

public class MainActivity extends AppCompatActivity {

    ImageView image;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        image=(ImageView)findViewById(R.id.hinhlogo);

        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                new LoadImageformInternet().execute("http://9mobi.vn/cf/images/2015/03/nkk/hinh-dep-1.jpg");
            }
        });
    }

    private class LoadImageformInternet extends AsyncTask<String, Void, Void>
    {

 protected void setimage(Bitmap bm){
     image.setImageBitmap(bm);
 }

        @Override
        protected Void doInBackground(String... params) {

            URL u= null;
            try {
                u = new URL(params[0]);
            } catch (MalformedURLException e) {
                e.printStackTrace();
            }

            try {
              Bitmap  Bmp = BitmapFactory.decodeStream(u.openConnection().getInputStream());
                setimage(Bmp);
            } catch (IOException e) {
                e.printStackTrace();
            }


            return null;
        }
    }




}

Lỗi:

06-15 10:00:25.101 2537-2679/com.example.lenghia.asyn E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
    Process: com.example.lenghia.asyn, PID: 2537
    java.lang.RuntimeException: An error occurred while executing doInBackground()
        at android.os.AsyncTask$3.done(AsyncTask.java:309)
        at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
        at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
        at java.util.concurrent.FutureTask.run(FutureTask.java:242)
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
        at java.lang.Thread.run(Thread.java:818)
     Caused by: java.lang.SecurityException: Permission denied (missing INTERNET permission?)
        at java.net.InetAddress.lookupHostByName(InetAddress.java:464)
        at java.net.InetAddress.getAllByNameImpl(InetAddress.java:252)
        at java.net.InetAddress.getAllByName(InetAddress.java:215)
        at com.android.okhttp.internal.Network$1.resolveInetAddresses(Network.java:29)
        at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:188)
        at com.android.okhttp.internal.http.RouteSelector.nextProxy(RouteSelector.java:157)
        at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:100)
        at com.android.okhttp.internal.http.HttpEngine.createNextConnection(HttpEngine.java:357)
        at com.android.okhttp.internal.http.HttpEngine.nextConnection(HttpEngine.java:340)
        at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:330)
        at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:248)
        at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:433)
        at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:384)
        at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:231)
        at com.example.lenghia.asyn.MainActivity$LoadImageformInternet.doInBackground(MainActivity.java:41)
        at com.example.lenghia.asyn.MainActivity$LoadImageformInternet.doInBackground(MainActivity.java:31)
        at android.os.AsyncTask$2.call(AsyncTask.java:295)
        at java.util.concurrent.FutureTask.run(FutureTask.java:237)
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234) 
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) 
        at java.lang.Thread.run(Thread.java:818) 
     Caused by: android.system.GaiException: android_getaddrinfo failed: EAI_NODATA (No address associated with hostname)
        at libcore.io.Posix.android_getaddrinfo(Native Method)
        at libcore.io.ForwardingOs.android_getaddrinfo(ForwardingOs.java:55)
        at java.net.InetAddress.lookupHostByName(InetAddress.java:451)
        at java.net.InetAddress.getAllByNameImpl(InetAddress.java:252) 
        at java.net.InetAddress.getAllByName(InetAddress.java:215) 
        at com.android.okhttp.internal.Network$1.resolveInetAddresses(Network.java:29) 
        at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:188) 
        at com.android.okhttp.internal.http.RouteSelector.nextProxy(RouteSelector.java:157) 
        at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:100) 
        at com.android.okhttp.internal.http.HttpEngine.createNextConnection(HttpEngine.java:357) 
        at com.android.okhttp.internal.http.HttpEngine.nextConnection(HttpEngine.java:340) 
        at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:330) 
        at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:248) 
        at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:433) 
        at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:384) 
        at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:231) 
        at com.example.lenghia.asyn.MainActivity$LoadImageformInternet.doInBackground(MainActivity.java:41) 
        at com.example.lenghia.asyn.MainActivity$LoadImageformInternet.doInBackground(MainActivity.java:31) 
        at android.os.AsyncTask$2.call(AsyncTask.java:295) 
        at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234) 
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) 
        at java.lang.Thread.run(Thread.java:818) 
     Caused by: android.system.ErrnoException: android_getaddrinfo failed: EACCES (Permission denied)
        at libcore.io.Posix.android_getaddrinfo(Native Method) 
        at libcore.io.ForwardingOs.android_getaddrinfo(ForwardingOs.java:55) 
        at java.net.InetAddress.lookupHostByName(InetAddress.java:451) 
        at java.net.InetAddress.getAllByNameImpl(InetAddress.java:252) 
        at java.net.InetAddress.getAllByName(InetAddress.java:215) 
        at com.android.okhttp.internal.Network$1.resolveInetAddresses(Network.java:29) 
        at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:188) 
        at com.android.okhttp.internal.http.RouteSelector.nextProxy(RouteSelector.java:157) 
        at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:100) 
        at com.android.okhttp.internal.http.HttpEngine.createNextConnection(HttpEngine.java:357) 
        at com.android.okhttp.internal.http.HttpEngine.nextConnection(HttpEngine.java:340) 
        at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:330) 
        at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:248) 
        at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:433) 
        at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:384) 
        at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:231) 
        at com.example.lenghia.asyn.MainActivity$LoadImageformInternet.doInBackground(MainActivity.java:41) 
        at com.example.lenghia.asyn.MainActivity$LoadImageformInternet.doInBackground(MainActivity.java:31) 
        at android.os.AsyncTask$2.call(AsyncTask.java:295) 
        at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234) 
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) 
        at java.lang.Thread.run(Thread.java:818) 
06-15 10:00:26.668 2537-2690/com.example.lenghia.asyn E/Surface: getSlotFromBufferLocked: unknown buffer: 0x7fc87f117000

Cảm ơn mọi người ạ.

AI_Android · June 15, 2016, 1:17am

Nhìn qua thì thấy có 2 vấn đề

Permission denied (missing INTERNET permission?)
Thêm: < uses-permission android:name=“android.permission.INTERNET” /> vào AndroidManifest.xml
set một image trong doinbackground có 2 cách giải quyết :v
runOnUIbackground
return cái bitmap lấy được trong doinbackground và override onPostExecute rồi set ở đây :v