Anroid 加载图片方式一 使用SmartImageView

首先到github网站下载SmartImageView，拷贝到工程

使用方式

public class SmartImageViewActivity extends BaseActivity {    private EditText mUrl;    private SmartImageView mImageView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_smart_image);        mUrl = (EditText) findViewById(R.id.editText1);        mImageView = (SmartImageView) findViewById(R.id.smartimage);    }    public void loadImage(View view){        String url = mUrl.getText().toString().trim();        mImageView.setImageUrl(url, R.drawable.ic_launcher, R.drawable.ic_launcher);    }}

SmartImageView源码

public class SmartImageView extends ImageView {    private static final int LOADING_THREADS = 4;    private static ExecutorService threadPool = Executors.newFixedThreadPool(LOADING_THREADS);    private SmartImageTask currentTask;    public SmartImageView(Context context) {        super(context);    }    public SmartImageView(Context context, AttributeSet attrs) {        super(context, attrs);    }    public SmartImageView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);    }    // Helpers to set image by URL    public void setImageUrl(String url) {        setImage(new WebImage(url));    }    public void setImageUrl(String url, SmartImageTask.OnCompleteListener completeListener) {        setImage(new WebImage(url), completeListener);    }    public void setImageUrl(String url, final Integer fallbackResource) {        setImage(new WebImage(url), fallbackResource);    }    public void setImageUrl(String url, final Integer fallbackResource, SmartImageTask.OnCompleteListener completeListener) {        setImage(new WebImage(url), fallbackResource, completeListener);    }    public void setImageUrl(String url, final Integer fallbackResource, final Integer loadingResource) {        setImage(new WebImage(url), fallbackResource, loadingResource);    }    public void setImageUrl(String url, final Integer fallbackResource, final Integer loadingResource, SmartImageTask.OnCompleteListener completeListener) {        setImage(new WebImage(url), fallbackResource, loadingResource, completeListener);    }    // Helpers to set image by contact address book id    public void setImageContact(long contactId) {        setImage(new ContactImage(contactId));    }    public void setImageContact(long contactId, final Integer fallbackResource) {        setImage(new ContactImage(contactId), fallbackResource);    }    public void setImageContact(long contactId, final Integer fallbackResource, final Integer loadingResource) {        setImage(new ContactImage(contactId), fallbackResource, fallbackResource);    }    // Set image using SmartImage object    public void setImage(final SmartImage image) {        setImage(image, null, null, null);    }    public void setImage(final SmartImage image, final SmartImageTask.OnCompleteListener completeListener) {        setImage(image, null, null, completeListener);    }    public void setImage(final SmartImage image, final Integer fallbackResource) {        setImage(image, fallbackResource, fallbackResource, null);    }    public void setImage(final SmartImage image, final Integer fallbackResource, SmartImageTask.OnCompleteListener completeListener) {        setImage(image, fallbackResource, fallbackResource, completeListener);    }    public void setImage(final SmartImage image, final Integer fallbackResource, final Integer loadingResource) {        setImage(image, fallbackResource, loadingResource, null);    }    public void setImage(final SmartImage image, final Integer fallbackResource, final Integer loadingResource, final SmartImageTask.OnCompleteListener completeListener) {        // Set a loading resource        if(loadingResource != null){            setImageResource(loadingResource);        }        // Cancel any existing tasks for this image view        if(currentTask != null) {            currentTask.cancel();            currentTask = null;        }        // Set up the new task        currentTask = new SmartImageTask(getContext(), image);        currentTask.setOnCompleteHandler(new SmartImageTask.OnCompleteHandler() {            @Override            public void onComplete(Bitmap bitmap) {                if(bitmap != null) {                    setImageBitmap(bitmap);                } else {                    // Set fallback resource                    if(fallbackResource != null) {                        setImageResource(fallbackResource);                    }                }                if(completeListener != null){                    completeListener.onComplete(bitmap);                }            }        });        // Run the task in a threadpool        threadPool.execute(currentTask);    }    public static void cancelAllTasks() {        threadPool.shutdownNow();        threadPool = Executors.newFixedThreadPool(LOADING_THREADS);    }}