常用的方法、知識（二）

1、給View增加顯示、隱藏動畫，靜態方法，全局調用。

/**
    * View顯示底部彈出動畫
    * */
    public static Animation ShowAnimation(Context context){
        Animation anim = AnimationUtils.loadAnimation(context, R.anim.push_bottom_in);
        return anim;
    }
    /**
    * View隱藏底部動畫
    * */
    public static Animation HideAnimation(Context context){
        Animation anim = AnimationUtils.loadAnimation(context, R.anim.push_bottom_out);
        return anim;
    }

調用代碼：

activity_public_delete_hint.startAnimation(BaseMethod.ShowAnimation(context));
activity_public_delete_hint.startAnimation(BaseMethod.HideAnimation(context));

2、獲取屏幕高度等參數：

//獲取狀態欄高度
    public static int Statusbar(Activity activity) {
        int high = 0;
        Rect rectangle = new Rect();
        Window window = activity.getWindow();
        window.getDecorView().getWindowVisibleDisplayFrame(rectangle);
        high = rectangle.top;
        return high;
    }

    //獲取屏幕高度
    public static int Shigh(Activity activity) {
        int Shigh = 0;
        WindowManager windowManager = activity.getWindow().getWindowManager();
        Display display = windowManager.getDefaultDisplay();
        Shigh = display.getHeight();
        return Shigh;
    }

    //獲取屏幕寬度
    public static int Swidth(Activity activity) {
        int Swidth = 0;
        WindowManager windowManager = activity.getWindow().getWindowManager();
        Display display = windowManager.getDefaultDisplay();
        Swidth = display.getWidth();
        return Swidth;
    }

    public static void MathScreen(Activity activity) {
        activity.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
    }

3、搜索的時候，需要將搜索的參數加入到服務器網址中，通過訪問帶關鍵字的網址得到返回值，這個時候不能直接將文字直接添加到網址中，需將輸入參數進行轉碼再構成網址，轉碼代碼：

/**
    * 網址輸入參數轉碼
    * */

    public static String urlcode(String str) {
        String text = null;
        try {
            text = URLEncoder.encode(str, "utf8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return text;
    }

4、像搜索功能，搜索得到一個列表，列表的每個子項是長文字，其中包含了搜索的文字，這時候，搜索文字的顏色應該跟其他字的顏色不一樣，改變一個Textview中部分文字的顏色代碼：

/**
    * 改變部分字體顏色
    * */
    public static void Tvcolor(TextView tv, String str, String tvcolor) {
        int fstart = str.indexOf(tvcolor);
        int fend = fstart + tvcolor.length();
        SpannableStringBuilder style = new SpannableStringBuilder(str);
        style.setSpan(new ForegroundColorSpan(Color.parseColor("#f58f2d")), fstart, fend, Spannable.SPAN_EXCLUSIVE_INCLUSIVE);
        tv.setText(style);
    }

5、判斷SDCard是否存在、讀取內存卡路徑

    public static String getSDCardPath() {
        File sdcardDir = null;
        boolean sdcardExist = Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);
        if (sdcardExist) {
            sdcardDir = Environment.getExternalStorageDirectory();
        }
        return sdcardDir.toString();
    }

6、將Bitmap保存到本地

public static String path = Environment.getExternalStorageDirectory().getPath();
    public static void saveMyBitmap(String bitName, Bitmap mBitmap) {
        File f = new File( path + "ico_0.png");
        try {
            f.createNewFile();
        } catch (IOException e) {
        }
        FileOutputStream fOut = null;
        try {
            fOut = new FileOutputStream(f);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        mBitmap.compress(Bitmap.CompressFormat.PNG, 100, fOut);
        try {
            fOut.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            fOut.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

7、讀取本地圖片文件，加載到Imageview上，如果本地圖片文件不存在，則在服務器下載

public static String path = Environment.getExternalStorageDirectory().getPath();
 public static void readusericon(String url, RoundImageView iv ) {
        File file = new File( path +"ico_0.png" );
        if (file.exists()) {
            Bitmap bm = BitmapFactory.decodeFile( path + "ico_0.png");
            iv.setImageBitmap(bm);
        } else {
            //如果本地圖片文件不存在，則在服務器下載
            new NormalLoadPictrue().getPicture(url, iv);
        }
    }

8、把數組轉換爲一個用逗號分隔的字符串 ，以便於將一組數據傳到服務器：

public static String converToString(String[] ig) {
        String str = "";
        if (ig != null && ig.length > 0) {
            for (int i = 0; i < ig.length; i++) {
                str += ig[i] + ",";
            }
        }
        str = str.substring(0, str.length() - 1);
        return str;
    }

9、把list轉換爲一個用逗號分隔的字符串，以便於將一組數據傳到服務器：

public static String listToString(List list) {
        StringBuilder sb = new StringBuilder();
        if (list != null && list.size() > 0) {
            for (int i = 0; i < list.size(); i++) {
                if (i < list.size() - 1) {
                    sb.append(list.get(i) + ",");
                } else {
                    sb.append(list.get(i));
                }
            }
        }
        return sb.toString();
    }

10、限制輸入法的Enter換行

public static void  limitEnter( EditText et ){
        et.setOnEditorActionListener(new TextView.OnEditorActionListener() {
            @Override
            public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                return (event.getKeyCode() == KeyEvent.KEYCODE_ENTER);
            }
        });
    }

11、將Textview所有字體都換成全角

public static String ToDBC(String input) {
        char[] c = input.toCharArray();
        for (int i = 0; i< c.length; i++) {
            if (c[i] == 12288) {
                c[i] = (char) 32;
                continue;
            }if (c[i]> 65280&& c[i]< 65375)
                c[i] = (char) (c[i] - 65248);
        }
        return new String(c);
    }

12、在內存卡創建文件夾以及二層文件夾，用於緩存目錄：

public static String path = Environment.getExternalStorageDirectory().getPath();
 public static void createSDCardDir(){
        if(Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())){
            // 創建一個文件夾對象，賦值爲外部存儲器的目錄
            //得到一個路徑，內容是sdcard的文件夾路徑和名字
            String str = path + "/myfile";
            File path1 = new File(str);
            if (!path1.exists()) {
                //若不存在，創建目錄，可以在應用啓動的時候創建
                path1.mkdirs();
            }
            String sunico= str + "/ico";
            File sunpath = new File(sunico);
            if (!sunpath.exists()) {
                //若不存在，創建目錄，可以在應用啓動的時候創建
                sunpath.mkdirs();
            }
        }
        else{
            return;
        }
    }

13、刪除文件、輸入參數是文件路徑

public static boolean deleteFile(String filePath) {
        File file = new File(filePath);
        if (file.isFile() && file.exists()) {
            return file.delete();
        }
        return false;
    }

14、解決viewpager與SwipeRefreshLayout的滑動衝突

    public static void setViewpagerSRL(ViewPager vp , final SwipeRefreshLayout srl){
        vp.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {
                    case MotionEvent.ACTION_MOVE:
                        srl.setEnabled(false);
                        break;
                    case MotionEvent.ACTION_UP:
                    case MotionEvent.ACTION_CANCEL:
                        srl.setEnabled(true);
                        break;
                }
                return false;
            }
        });
    }