我想每次增加0.1的浮動值。但是我有時候會變得很奇怪。問題與浮動增量在Android中
float kmVal = 0.0f;
EditText kms = (EditText) findViewById(R.id.km);
kmVal = Float.valueOf(kms.getText().toString());
點擊按鈕我正在增加值。
kmVal += 0.1;
kms.setText(String.valueOf(kmVal));
LOG: -
06-24 13:16:21.644: I/System.out(958): Value ==0.1
06-24 13:16:21.644: I/System.out(958): String Value ==0.1
06-24 13:16:21.886: D/SntpClient(61): request time failed: java.net.SocketException: Address family not supported by protocol
06-24 13:16:22.145: I/System.out(958): Value ==0.2
06-24 13:16:22.145: I/System.out(958): String Value ==0.2
06-24 13:16:22.384: I/System.out(958): Value ==0.3
06-24 13:16:22.384: I/System.out(958): String Value ==0.3
06-24 13:16:22.484: I/System.out(958): Value ==0.4
06-24 13:16:22.484: I/System.out(958): String Value ==0.4
06-24 13:16:22.684: I/System.out(958): Value ==0.5
06-24 13:16:22.684: I/System.out(958): String Value ==0.5
06-24 13:16:22.868: I/System.out(958): Value ==0.6
06-24 13:16:22.874: I/System.out(958): String Value ==0.6
06-24 13:16:23.056: I/System.out(958): Value ==0.70000005
06-24 13:16:23.064: I/System.out(958): String Value ==0.70000005
06-24 13:16:23.884: I/System.out(958): Value ==0.8000001
06-24 13:16:23.884: I/System.out(958): String Value ==0.8000001
06-24 13:16:23.964: D/dalvikvm(353): GC_EXPLICIT freed 7K, 44% free 3532K/6279K, external 716K/1038K, paused 106ms
06-24 13:16:24.536: I/System.out(958): Value ==0.9000001
06-24 13:16:24.536: I/System.out(958): String Value ==0.9000001
你可以從日誌高達0.6的值是確定,但之後其加入額外的數字,我不希望看到的。我不知道爲什麼我會得到這樣的結果。如果有人有任何想法,請提供幫助。
謝謝
這不是特定於Android,甚至Java。 –