Android 开发中的一些小技巧

dip转px

    public int convertDipOrPx(int dip) {
        float scale = MarketApplication.getMarketApplicationContext()
                .getResources().getDisplayMetrics().density;
        return (int) (dip * scale + 0.5f * (dip >= 0 ? 1 : -1));
    }

获取当前窗体,并添加自定义view:

getWindowManager()
                .addView(
                        overlay,
                        new WindowManager.LayoutParams(
                                LayoutParams.WRAP_CONTENT,
                                LayoutParams.WRAP_CONTENT,
                                WindowManager.LayoutParams.TYPE_APPLICATION,
                                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
                                        | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE,
                                PixelFormat.TRANSLUCENT));

自定义fastScrollBar图片样式：

        try {
            Field f = AbsListView.class.getDeclaredField("mFastScroller");
            f.setAccessible(true);
            Object o = f.get(listView);
            f = f.getType().getDeclaredField("mThumbDrawable");
            f.setAccessible(true);
            Drawable drawable = (Drawable) f.get(o);
            drawable = getResources().getDrawable(R.drawable.ic_launcher);
            f.set(o, drawable);
            Toast.makeText(this, f.getType().getName(), 1000).show();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

=网络==================================

判断网络是否可用：

/**
	 * 网络是否可用
	 * 
	 * @param context
	 * @return
	 */
	public static boolean isNetworkAvailable(Context context) {
		ConnectivityManager mgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
		NetworkInfo[] info = mgr.getAllNetworkInfo();
	    if (info != null) {
	    	for (int i = 0; i < info.length; i++) {
	    		if (info[i].getState() == NetworkInfo.State.CONNECTED) {
	    			return true;
	    		}
	    	}
	    }
		return false;
	}

方法二：

    /*
     * 判断网络连接是否已开 2012-08-20true 已打开 false 未打开
     */
    public static boolean isConn(Context context) {
        boolean bisConnFlag = false;
        ConnectivityManager conManager = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo network = conManager.getActiveNetworkInfo();
        if (network != null) {
            bisConnFlag = conManager.getActiveNetworkInfo().isAvailable();
        }
        return bisConnFlag;
    }

判断是不是Wifi连接：

    public static boolean isWifiActive(Context icontext) {
        Context context = icontext.getApplicationContext();
        ConnectivityManager connectivity = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo[] info;
        if (connectivity != null) {
            info = connectivity.getAllNetworkInfo();
            if (info != null) {
                for (int i = 0; i < info.length; i++) {
                    if (info[i].getTypeName().equals("WIFI")
                            && info[i].isConnected()) {
                        return true;
                    }
                }
            }
        }
        return false;
    }

判断当前网络类型

/**
	 * 网络方式检查
	 */
	private static int netCheck(Context context) {
		ConnectivityManager conMan = (ConnectivityManager) context
				.getSystemService(Context.CONNECTIVITY_SERVICE);
		State mobile = conMan.getNetworkInfo(ConnectivityManager.TYPE_MOBILE)
				.getState();
		State wifi = conMan.getNetworkInfo(ConnectivityManager.TYPE_WIFI)
				.getState();
		if (wifi.equals(State.CONNECTED)) {
			return DO_WIFI;
		} else if (mobile.equals(State.CONNECTED)) {
			return DO_3G;
		} else {
			return NO_CONNECTION;
		}
	}