Android 小方法

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根据图片名获取图片id

 public static int getDrawbleId(Context context, String name) {        return context.getResources().getIdentifier(name, "drawable", context.getPackageName());    }

获取textView是否被截断 stackoverflow
在ViewHolder中不调用onGlobalLayoutListener,使用onPreDrawListener

     textView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {            @Override            public void onGlobalLayout() {                if (Build.VERSION.SDK_INT >= 16) {                    textView.getViewTreeObserver().removeOnGlobalLayoutListener(this);                }else {                    textView.getViewTreeObserver().removeGlobalOnLayoutListener(this);                }                Layout l = textView.getLayout();                if (l != null) {                    int lines = l.getLineCount();                    if (lines > 0)                        if (l.getEllipsisCount(lines - 1) > 0)                            LogUtil.d("Text is ellipsized");                }            }        });

ListView模拟点击 stackoverflow

lv_left.performItemClick(mAdapter.getView(position, null, null), position, mAdapter.getItemId(position));

判断当前线程是否为主线程

if (Looper.myLooper() == Looper.getMainLooper()){    //...}

设置和获取Actionbar高度

if(getContext().getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true)) {    int actionBarHeight = TypedValue.complexToDimensionPixelSize(tv.data,getResources().getDisplayMetrics());}//在style中配置<item name="android:actionBarSize">@dimen/actionBar_size</item><item name="actionBarSize">@dimen/actionBar_size</item>

Fragment 展出、消失动画

getFragmentManager().beginTransaction()    //设置动画要在add之前    .setCustomAnimations(R.anim.left_to_right,R.anim.right_to_left, R.anim.left_to_right, R.anim.right_to_left)    .add(R.id.mainContainer, Fragment.instantiate(mContext, name), "TAG")    .addToBackStack(null)    .commitAllowingStateLoss();

遍历SpareArray

// 用keyAt(int index)获取索引或者valueAt(int index)获取值int key = 0;for(int i = 0,size = sparseArray.size(); i < size; i++) {       key = sparseArray.keyAt(i);       Object obj = sparseArray.get(key);}

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