发表于

  • Android 中多个按钮同时监听的除实现onClickListener方法的另一个方法：
    用一个工具类，里面主要实现该方法，如下：

    public static void setClicks(final View.OnClickListener listener, final View... views) {
    for (View v : views) {
        v.setOnClickListener(listener);
    }
}

  • 在具体的监听方法里面，我们这样实现：（后面的参数就是各个被监听的对象）

    ViewUtil.setClicks(this, mVAvatar, mVVipTag, mVGrade, mVDiamond, mVDiamondTag,
    mVBill, mVOrder, mVMyVisitors, mVMyGallery, mVMyGift, mVGiftExchange);

  • 在监听事件中，我们如下实现

    @Override
public void onClick(View v) {
    Activity activity = getActivity();
    if (v == mVAvatar) {
        Intent personalInfoIntent = new Intent(activity, PersonalInfoActivity.class);
        activity.startActivity(personalInfoIntent);
    } else if (v == mVVipTag) {
        String url = ServiceUrlConstants.URL.getVipIntroductionUrl();
        Map<String, String> queryParameters = new LinkedHashMap<>();
        queryParameters.put(UrlConstant.USER_ID, UserSecretInfoUtil.getUserId());
        queryParameters.put(UrlConstant.DEVICE_ID, DeviceInfo.getDeviceId(BaseApplication.getContext()));
        url = UrlUtils.splitJoint(url, queryParameters);
        Bundle bundle = new Bundle();
        bundle.putString(RefreshWebViewActivity.WEB_VIEW_BUNDLE_TITLE,           BaseApplication.getContext().getString(R.string.vip_introduction));
        bundle.putString(RefreshWebViewActivity.WEB_VIEW_BUNDLE_LOAD_URL, url);
        Intent intent = new Intent(activity, RefreshWebViewActivity.class);
        intent.putExtra(RefreshWebViewActivity.WEBVIEW_BUNDLE_NAME, bundle);
        activity.startActivity(intent);
    } else if (v == mVGrade) {
        Intent gradeIntent = new Intent(activity, GradeActivity.class);
        activity.startActivity(gradeIntent);
    }
}

发表于

Snackbar的使用方法

Snackbar.make(view, "data deleted",
               Snackbar.LENGTH_LONG)
               .setAction("Undo",
               new View.OnclickListener(){
               @override
               public void onclick(View v){
                   // do something
               }
          }).show();

发表于

Volley 相关的使用方法：

首先创建一个AppController 类

再创建一个图片缓存的LruBitmapCache类:

  1. 创建一个AppController 类

    public class AppController extends Application{

    public static final String TAG = AppController.class.getSimpleName();

private RequestQueue mRequestQueue;
private ImageLoader mImageLoader;

private static AppController mInstance;

@Override
public void onCreat(){
    super.onCreat();
    mInstance = this;
}

public static synchroinzed AppController getInstance(){
    return mInstance;
}

public RequestQueue getRequestQueue(){
    if(mInstance == null){
        mRequestQueue = Volley.newRequestQueue(getApplicationContext());
    }
    return mRequestQueue;
}

public ImageLoader getImageLoader(){
    getRequestQueue();

    if(mImageLoader == null){
        mImageLoader = new ImageLoader(this.mRequestQueue, new LruBitmapCache());
    }
    return this.mImageLoader;
}

public <T> void addToRequestQueue(Request<T> req, String tag){
    req.setTag(TextUtil.isEmpty(tag) ? TAG : tag);
    getRequestQueue().add(req);
}

public void cancelPendingRequests(Object tag){
    if(mRequestQueue != null){
        mRequestQueue.cancelAll(tag);
    }
}

    }

  2. 创建一个图片缓存的LruBitmapCache类

    public class LruBitmapCache extends LruCache<String, Bitmap> implement ImageCache{
    public static int getDefaultLruCacheSize(){
        final int maxMemory = (int) (Runtime.getRuntime().maxMemory / 1034);
        final int cacheSize = maxMemory / 8;

        return cacheSize;
    }

    public LruBitmapCache(){
        this(getDefaultLruCacheSize());
    }

    public LruBitmapCache(int sizeInkiloBytes){
        super(sizeInkiloBytes);
    }

    @Override
    protected int sizeOf(String key, Bitmap value){
        return value.getRowBytes() * value.getHeight() / 1024;
    }

    @Override
    public Bitmap getBitmap(String url){
        return get(url);
    }

    @Override
    public void putBitmap(String url, Bitmap bitmap){
        put(url, bitmap);
    }
}

  3. 各类函数对以上两个方法的调用来获取所需的网络数据

    public void JsonFun(){

    String tag_json_obj = "json_obj_req";
    String url = "http://api.androidhive.info/volley/person_object.json";

    JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.GET, url, null,
                    new Response.Listener<JSONObject>(){

                        @Override
                        public void onResponse(JSONObject reponse){
                            Log.d(TAG, reponse.toString());
                        }
                    }, new Response.ErrorListener(){

                        @Override
                        public void onErrorResponse(VolleyError error){
                            VolleyLog.d(TAG, "Error:" + error.getMessage());
                        }
                    });

    AppController.getInstance().addToRequestQueue(jsonObjReq, tag_json_obj);

}

public void StringFun(){
    String tag_string_req = "string_req";
    String url = "";

    ProgressDialog pDialog = new ProgressDialog(this);
    pDialog.setMessage("Loading...");
    pDialog.show();

    StringRequest strReq = new StringRequest(Method.GET,
                url, new Response.Listener<String>(){
                    Log.d(TAG, reponse.toString());
                    pDialog.hide();
                }, new Response.ErrorListener(){

                    @Override
                    public void onErrorResponse(VolleyError error){
                        VolleyLog.d(TAG, "Error:" + error.getMessage);
                        pDialog.hide();
                    }
                });
    AppController.getInstance.addToRequestQueue(strReq, tag_string_req);
}

Post请求：

public void PostFun(){
    String tag_json_obj = "json_obj_req";

    String url = "";
    ProgressDialog pDialog = new ProgressDialog(this);
    pDialog.setMessage("Loading...");
    pDialog.show();

    JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.POST,
                url, null,
                new Response.Listener<JSONObject>(){

                @Override
                public void onResponse(JSONObject reponse){
                    Log.d(TAG, reponse.toString());
                    pDialog.hide();
                }
            }, new Response.ErrorListener(){
                @Override
                public void onErrorResponse(VolleyError error){
                    VolleyLog.d(TAG, "Error:" + error.getMessage());
                    pDialog.hide();
                }
            }){
        @Override
        protected Map<String, String> getParams(){
            Map<String, String> params = new HashMap<String, String>();
            params.put("name", "Androidhive");
            params.put("email", "abc@androidhive.info");
            params.put("password", "password123");

            return params;
        }

    };

    AppController.getInstance().addToRequestQueue(jsonObjReq, tag_json_obj);
}

请求图片的函数：

public void setImageFun(){
    ImageLoader imgLoader = AppController.getInstance().getImageLoader();

    //复杂写法
    imgLoader.get(Const.URL_IMAGE, new ImageListener(){
        @Override
        public void onErrorResponse(VolleyError error){
            Log.e(TAG, "Image Load Error:" + error.getMessage());
        }

        @Override
        public void onResponse(ImageContainer reponse, boolean arg1){
            if(reponse.getBitmap() != null){
                //load image into imageview
                imageview.setImageBitemap(reponse.getBitmap());
            }
        }
    })；

    //简便写法
    imgLoader.get(Const.URL_IMAGE, ImageLoader.getImageListener(imageview, imageView, R.drawable.ico_loading, R.drawable.ico_error));
}

关于Cache:

public void volleyCacheFun（）{
    Cache cache = AppController.getInstance().getRequestQueue().getCache();
    Entry entry = cache.get(url);

    if(entry != null){
        try{
            String data = new String(entry.data, "UTF-8");
        }catch(UnsupportedEncodingException e){
            e.printStackTrace();
        }
    } else {
        // Cached response doesn't exists. Make network call here
    }
}

//刷新页面
App.getInstance().getRequestQueue().getCache().invalidate(u, true);

//关闭cache
//String request
StringRequest stringReq = new StringRequest(...);

//disable cache
stringReq.setShouldCache(false);

//删除某个URL的Cache
AppController.getInstance().getRequestQueue().getCache().remove(url);

//删除所有的cache
AppController.getInstance().getRequestQueue().getCache().clear();

//取消请求
String tag_json_arry = "json_req";
AppController.getInstance().getRequestQueue().cancelAll("feed_request");

设置请求的优先级：

public void requestPriorityFun(){
    private Priority priority = PostFun.HIGH;

    StringRequest strReq = new StringRequest(Method.GET,
                Const.URL_STRING_REQ, new Response.Listener<String>(){

                    @Override
                    public void onResponse(String reponse){
                        Log.d(TAG, reponse.toString());
                        msgResponse.setText(reponse,toString());
                        hideProgressDialog();
                    }
                }, new Response.ErrorListener(){
                    @Override
                    public void onErrorResponse(VolleyError error){
                        VolleyLog.d(TAG, "Error:" + error.getMessage());
                        hideProgressDialog();
                    }
                }){
            @Override
            public Priority getPriority(){
                return priority;
            }
        };
}

添加请求头部信息：

public void addHeadFun(){
    String tag_json_obj = "json_obj_req";
    String url = "";
    ProgressDialog pDialog = new ProgressDialog(this);
    pDialog.setMessage("Loading");
    pDialog.show();
    JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.POST, url, null, new Response.Listener<JSONObject>(){
        @Override
        public void onResponse(JSONObject reponse){
            Log.d(TAG, reponse.toString());
            pDialog.hide();
        }
    }, new Response.ErrorListener(){
        @Override
        public void onErrorResponse(VolleyError error){
            VolleyLog.d(TAG, "Error:" + error.getMessage());
            pDialog.hide();
        }
    }){
        @Override
        public Map<String, String> getHeaders() throws AuthFailureError{
            HashMap<String, String> headers = new HashMap<String, String>();
            headers.put("Content-Type", "application/json");
            headers.put("apiKey", "********");
            return headers;
        }
    };
    AppController.getInstance().addToRequestQueue(jsonObjReq, tag_json_obj);
}

发表于

  • 仿雅虎天气的滚动模糊防止滑动留白的代码

    void setImageHeight(ImageView imageView, Context context){

    WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);

    Display display = windowManager.getDefaultDisplay();
    Point point = new Point();
    display.getSize(point);

    int height = point.y;
    ViewGroup.LayoutParams params = imageView.getLayoutParams();
    params.width = ViewGroup.LayoutParams.MATCH_PARENT;
    params.height = height + 100;

    imageView.requestLayout();
}

发表于

发表于

Welcome to Hexo! This is your very first post. Check documentation for more info. If you get any problems when using Hexo, you can find the answer in troubleshooting or you can ask me on GitHub.

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