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Android三种基本的加载网络图片方式，包括普通加载网络方式、用ImageLoader加载图片、用Volley加载图片。
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public class NormalLoadPictrue { private String uri; private ImageView imageView; private byte[] picByte; public void getPicture(String uri,ImageView imageView){ this.uri = uri; this.imageView = imageView; new Thread(runnable).start(); } @SuppressLint("HandlerLeak") Handler handle = new Handler(){ @Override public void handleMessage(Message msg) { super.handleMessage(msg); if (msg.what == 1) { if (picByte != null) { Bitmap bitmap = BitmapFactory.decodeByteArray(picByte, 0, picByte.length); imageView.setImageBitmap(bitmap); } } } }; Runnable runnable = new Runnable() { @Override public void run() { try { URL url = new URL(uri); HttpURLConnection conn = (HttpURLConnection)url.openConnection(); conn.setRequestMethod("GET"); conn.setReadTimeout(10000); if (conn.getResponseCode() == 200) { InputStream fis = conn.getInputStream(); ByteArrayOutputStream bos = new ByteArrayOutputStream(); byte[] bytes = new byte[1024]; int length = -1; while ((length = fis.read(bytes)) != -1) { bos.write(bytes, 0, length); } picByte = bos.toByteArray(); bos.close(); fis.close(); Message message = new Message(); message.what = 1; handle.sendMessage(message); } }catch (IOException e) { e.printStackTrace(); } } }; } |
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public class ImageLoaderPicture { private DisplayImageOptions options; public ImageLoaderPicture(Context context) { ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(context).threadPriority(Thread.NORM_PRIORITY - 2) .denyCacheImageMultipleSizesInMemory() .discCacheFileNameGenerator(new Md5FileNameGenerator()) .tasksProcessingOrder(QueueProcessingType.LIFO).enableLogging() .memoryCache(new WeakMemoryCache()) .build(); ImageLoader.getInstance().init(config); options = new DisplayImageOptions.Builder() .showStubImage(0) .showImageForEmptyUri(0) .showImageOnFail(0) .cacheInMemory().cacheOnDisc() .imageScaleType(ImageScaleType.IN_SAMPLE_INT) .bitmapConfig(android.graphics.Bitmap.Config.RGB_565) .build(); } public DisplayImageOptions getOptions() { return options; } public void setOptions(DisplayImageOptions options) { this.options = options; } } |
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public class VolleyLoadPicture { private ImageLoader mImageLoader = null; private BitmapCache mBitmapCache; private ImageListener one_listener; public VolleyLoadPicture(Context context,ImageView imageView){ one_listener = ImageLoader.getImageListener(imageView, 0, 0); RequestQueue mRequestQueue = Volley.newRequestQueue(context); mBitmapCache = new BitmapCache(); mImageLoader = new ImageLoader(mRequestQueue, mBitmapCache); } public ImageLoader getmImageLoader() { return mImageLoader; } public void setmImageLoader(ImageLoader mImageLoader) { this.mImageLoader = mImageLoader; } public ImageListener getOne_listener() { return one_listener; } public void setOne_listener(ImageListener one_listener) { this.one_listener = one_listener; } class BitmapCache implements ImageCache { private LruCache<String, Bitmap> mCache; private int sizeValue; public BitmapCache() { int maxSize = 10 * 1024 * 1024; mCache = new LruCache<String, Bitmap>(maxSize) { @Override protected int sizeOf(String key, Bitmap value) { sizeValue = value.getRowBytes() * value.getHeight(); return sizeValue; } }; } @Override public Bitmap getBitmap(String url) { return mCache.get(url); } @Override public void putBitmap(String url, Bitmap bitmap) { mCache.put(url, bitmap); } } } |
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public class MainActivity extends Activity { private ImageView imageView001,imageView002,imageView003; public static final String picUrl = "http://img.quwenjiemi.com/2014/0701/thumb_420_234_20140701112917406.jpg"; //public static final String picUrl = "http://192.168.1.181:8081/AndroidSerivces/house.jpg"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); imageView001 = (ImageView)findViewById(R.id.imageView001); imageView002 = (ImageView)findViewById(R.id.imageView002); imageView003 = (ImageView)findViewById(R.id.imageView003); //用普通方法加载图片 new NormalLoadPictrue().getPicture(picUrl,imageView001); //用ImageLoader加载图片 ImageLoader.getInstance().displayImage(picUrl, imageView002,new ImageLoaderPicture(this).getOptions(),new SimpleImageLoadingListener()); //用Volley加载图片 VolleyLoadPicture vlp = new VolleyLoadPicture(this, imageView003); vlp.getmImageLoader().get(picUrl, vlp.getOne_listener()); } } |
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<ScrollView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity" > <RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent" android:padding="10dp"> <TextView android:id="@+id/textView001" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="1.用普通方法的加载图片"/> <ImageView android:id="@+id/imageView001" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/textView001"/> <TextView android:id="@+id/textView002" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/imageView001" android:text="2.用Android-Universal-Image-Loader加载图片"/> <ImageView android:id="@+id/imageView002" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/textView002"/> <TextView android:id="@+id/textView003" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/imageView002" android:text="3.用Volley加载图片"/> <ImageView android:id="@+id/imageView003" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/textView003"/> </RelativeLayout></ScrollView> |
转自：http://www.oschina.net/code/snippet_1470644_36944
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原文地址：http://www.cnblogs.com/SharkBin/p/4596961.html
