Android下载图片

简单写了个请求网络下载图片，保存到sdcard中,并在app中展示图片

public class MainActivity extends AppCompatActivity {    private ImageView mIamgeView ;    Handler handler  = new Handler();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mIamgeView  = (ImageView) findViewById(R.id.imageview);       new MyThread("http://b.hiphotos.baidu.com/image/pic/item/7a899e510fb30f2493c8cbedcc95d143ac4b0389.jpg",mIamgeView,handler).start();    }}

然后写一个工具类

public class MyThread extends Thread {    private String uri;    private ImageView imageView;    Handler handler;    private File name;    public MyThread(String uri, ImageView imageView, Handler handler) {        this.uri = uri;        this.imageView = imageView;        this.handler = handler;    }    @Override    public void run() {        super.run();        try {            final URL httpuri = new URL(uri);            HttpURLConnection connection = (HttpURLConnection) httpuri.openConnection();            connection.setReadTimeout(2000);            connection.setRequestMethod("GET");            connection.setConnectTimeout(2000);            connection.setDoInput(true);            InputStream inputStream = connection.getInputStream();            FileOutputStream fos   = null;            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {                File file = Environment.getExternalStorageDirectory();                name = new File(file, "a");                fos = new FileOutputStream(name);            }            byte [] b = new byte[1024];            int len;            while((len=inputStream.read(b))!=-1){                fos.write(b,0,len);            }            final Bitmap bitmap = BitmapFactory.decodeFile(name.getAbsolutePath());            handler.post(new Runnable() {                @Override                public void run() {                    imageView.setImageBitmap(bitmap);                }            });        } catch (Exception e) {            e.printStackTrace();        }    }}

最后别忘了加二个权限，一个是写sdcard,一个是请求网络。
我输入的URL是一张美图哦。展示美图效果：

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