Android Handler警告，SimpleDateFormat警告

1：Handler
// This Handler class should be static or leaks might occur: IncomingHandler
    @SuppressLint("HandlerLeak")
    private Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {

};
};

解决方法：

private Handler mHandler = new Handler(new Handler.Callback() {
        @Override
        public boolean handleMessage(Message msg) {
            return false;
        }
    });

2：SimpleDateFormat

// To get local formatting use getDateInstance(), getDateTimeInstance(), or
    // getTimeInstance(), or use new SimpleDateFormat(String template, Locale
    // locale) with for example Locale.US for ASCII dates.
    @SuppressLint("SimpleDateFormat")
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat(
            "yyyy-MM-ddHH:mm:ss");
解决方法：

SimpleDateFormat newSimpleDateFormat = new SimpleDateFormat(
"yyyy年MM月dd日HH时mm分", Locale.getDefault());

3：new HashMap()
@SuppressLint("UseSparseArrays")
public static Map CMD_MAP = new HashMap();

警告原因：Use new SparseArray(...) instead for better performance

4："String".toUpperCase(); "String".toLowerCase();

@SuppressLint("DefaultLocale")
boolean b = "String".toUpperCase().equals("STRING");
解决方法：
boolean b = "String".equalsIgnoreCase("STRING");
警告原因：Implicitly using the default locale is a common source of bugs: Use toUpperCase(Locale) instead

巴特西

Android Handler警告，SimpleDateFormat警告

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