Android开发常用集锦(持续更新...)

转载请注明出处：https://www.jianshu.com/p/691278bea1f9
本文出自Shawpoo的简书
我的博客：CSDN博客

1、TextView添加删除线

   /**
     * TextView添加删除线
     *
     * @param textView
     */
    public static void setDeleteLine(TextView textView) {
        textView.getPaint().setFlags(Paint.STRIKE_THRU_TEXT_FLAG);
    }

2、Java代码中给TextView设置Drawable

  /**
     * TextView设置drawable，不设置传0
     *
     * @param context
     * @param leftResId   左
     * @param topResId    上
     * @param rightResId  右
     * @param bottomResId 下
     * @param textView
     */
    public static void setTextDrawable(Context context, int leftResId, int topResId, int rightResId, int bottomResId, TextView textView) {
        Drawable drawableLeft = leftResId == 0 ? null : context.getResources().getDrawable(leftResId);
        Drawable drawableTop = topResId == 0 ? null : context.getResources().getDrawable(topResId);
        Drawable drawableRight = rightResId == 0 ? null : context.getResources().getDrawable(rightResId);
        Drawable drawableBottom = bottomResId == 0 ? null : context.getResources().getDrawable(bottomResId);
        textView.setCompoundDrawablesWithIntrinsicBounds(drawableLeft, drawableTop, drawableRight, drawableBottom);
    }

3、TabLayout设置横线的左右间隔

 /**
     * 设置TabLayout tab横线的长度
     *
     * @param tabs
     * @param leftDip  左边的间隔
     * @param rightDip 右边的间隔
     */
    public static void setTabLayoutIndicator(TabLayout tabs, int leftDip, int rightDip) {
        Class<?> tabLayout = tabs.getClass();
        Field tabStrip = null;
        try {
            tabStrip = tabLayout.getDeclaredField("mTabStrip");
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        }

        tabStrip.setAccessible(true);
        LinearLayout llTab = null;
        try {
            llTab = (LinearLayout) tabStrip.get(tabs);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }

        int left = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, leftDip, Resources.getSystem().getDisplayMetrics());
        int right = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, rightDip, Resources.getSystem().getDisplayMetrics());

        for (int i = 0; i < llTab.getChildCount(); i++) {
            View child = llTab.getChildAt(i);
            child.setPadding(0, 0, 0, 0);
            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.MATCH_PARENT, 1);
            params.leftMargin = left;
            params.rightMargin = right;
            child.setLayoutParams(params);
            child.invalidate();
        }
    }

4、调用拨号界面

  /**
    * 调用拨号界面
    *
    * @param phone 电话号码
    */
    public static void call(Context context, String phone) {
        Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse("tel:" + phone));
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(intent);
    }

5、调用手机浏览器

   /**
     * 调用手机浏览器
     *
     * @param url
     */
    public static void openBrowser(Context context, String url) {
        Intent intent = new Intent();
        intent.setAction("android.intent.action.VIEW");
        Uri content_url = Uri.parse(url);
        intent.setData(content_url);
        context.startActivity(intent);
    }

6、隐藏软键盘

   /**
     * 隐藏软键盘
     *
     * @param context
     */
    public static void systemSoftInput(Context context, View view) {
        InputMethodManager imm = (InputMethodManager) context.getSystemService(Context
                .INPUT_METHOD_SERVICE);
        imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
    }

7、判断应用是否安装

   /**
     * 判断应用是否安装
     *
     * @param packageName
     * @return
     */
    public static boolean checkApkExist(Context context, String packageName) {
        if (packageName == null || "".equals(packageName))
            return false;
        try {
            ApplicationInfo info = context.getPackageManager().getApplicationInfo(packageName,
                    PackageManager.GET_UNINSTALLED_PACKAGES);
            return true;
        } catch (PackageManager.NameNotFoundException e) {
            return false;
        }
    }

8、获取APP版本号或版本名称

/**
     * 获取APP版本号
     */
    public static int getAppVersionCode(Context context) {
        int localVersion = 0;
        try {
            PackageInfo packageInfo = context.getApplicationContext()
                    .getPackageManager()
                    .getPackageInfo(context.getPackageName(), 0);
            localVersion = packageInfo.versionCode;
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        return localVersion;
    }

    /**
     * 获取APP版本名称
     */
    public static String getAppVersionName(Context context) {
        String localVersion = "";
        try {
            PackageInfo packageInfo = context.getApplicationContext()
                    .getPackageManager()
                    .getPackageInfo(context.getPackageName(), 0);
            localVersion = packageInfo.versionName;
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        return localVersion;
    }

9、strings.xml 中的使用技巧

• 空格：两个 占半个字符，一个\u3000占一个字符。
• 模板：%1$s，%1$d可以用来当做模板。

持续更新...