原文地址：解决Android中Handler警告、SimpleDateFormat警告、"String".toUpperCase()警告
作者：于任道
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;
}
});
警告原因：
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
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