问题描述
这是崩溃发生的线
offsetDuration = duration - (offsets.containsKey(freq)
? offsets.get(freq) : 0l);
通过捕获Exception并转储变量得到的值，
long offsetDuration = 0;
long duration = 391144;
TreeMap<Long, Long> offsets = {0=4024974.0, 1036800=8588.0, 1190400=88216.0, 1267200=49763.0, 1497600=87476.0, 1574400=7469.0, 1728000=54553.0, 1958400=60512.0, 2265600=246942.0, 300000=390779.0, 422400=39945.0, 652800=55204.0, 729600=46829.0, 883200=19191.0, 960000=23888.0}
long freq = 300000;
使用下面的代码从json文件解析变量TreeMap<Long, Long> offsets 。
@NonNull
public static TreeMap<Long, Long> getOffsets(Context context) throws CpuStateException {
File file = getOffsetsFile(context);
TreeMap<Long, Long> map;
try {
String s = Files.toString(file, Charsets.UTF_8).trim();
Gson gson = new GsonBuilder().create();
Type type = new TypeToken<TreeMap<Long, Long>>(){}.getType();
map = gson.fromJson(s, type);
} catch (IOException e) {
throw new CpuStateException("Failed to read offsets!");
}
if (map == null)
throw new CpuStateException("Failed to read offsets!");
return map;
}
在多次检查代码之后，我无法确定此代码可以抛出的情况
java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Long
at java.lang.Long.compareTo(Long.java:32)
at java.util.TreeMap.find(TreeMap.java:277)
at java.util.TreeMap.findByObject(TreeMap.java:351)
at java.util.TreeMap.containsKey(TreeMap.java:182)
at com.vibhinna.library.engine.CpuStates.getCpuData(CpuStates.java:96)
at com.vibhinna.library.engine.CpuStates.getBarData(CpuStates.java:162)
有任何想法吗？
更新1：这是json的生成方式：
public static void offsetTimers(TreeMap<Long, Long> offsets, Context context) throws CpuStateException {
Gson gson = new GsonBuilder().create();
String json = gson.toJson(offsets);
File file = getOffsetsFile(context);
try {
OutputStreamWriter outputStream = new OutputStreamWriter(new FileOutputStream(file),
"UTF-8");
outputStream.write(json);
outputStream.flush();
outputStream.close();
} catch (IOException e) {
throw new CpuStateException("Failed to save offsets!");
}
}
更新2 ：我甚至无法在原始应用程序中重现这一点，崩溃很少见，只有少于1％的客户报告。
更新3
offset class: class java.lang.String value: 1036800
offset class: class java.lang.String value: 1190400
offset class: class java.lang.String value: 1267200
offset class: class java.lang.String value: 1497600
offset class: class java.lang.String value: 1574400
offset class: class java.lang.String value: 1728000
offset class: class java.lang.String value: 1958400
offset class: class java.lang.String value: 2265600
offset class: class java.lang.String value: 300000
offset class: class java.lang.String value: 422400
offset class: class java.lang.String value: 652800
offset class: class java.lang.String value: 729600
offset class: class java.lang.String value: 883200
offset class: class java.lang.String value: 960000
JSON：
{
"0":256093,
"300000":105045,
"422400":9677,
"652800":10443,
"729600":8868,
"883200":3951,
"960000":7323,
"1036800":18668,
"1190400":34938,
"1267200":17151,
"1497600":11018,
"1574400":1173,
"1728000":22881,
"1958400":21076,
"2265600":66501
}
1楼
这是似乎有效的丑陋的解决方法。
@NonNull
public static TreeMap<Long, Long> getOffsets(Context context) throws CpuStateException {
File file = getOffsetsFile(context);
TreeMap map;
try {
String s = Files.toString(file, Charsets.UTF_8).trim();
Gson gson = new GsonBuilder().create();
Type type = new TypeToken<TreeMap<Long, Long>>(){}.getType();
map = gson.fromJson(s, type);
} catch (IOException e) {
throw new CpuStateException("Failed to read offsets!");
}
if (map == null)
throw new CpuStateException("Failed to read offsets!");
// So, I don't trust Gson. On some devices the above code seems to be producing a
// TreeMap<String, Double/Float>. So let's assume it's either a String or a boxed primitive.
// Even if the assumption is wrong we're no worse off than we were before.
// The String we'll parse, the primitive we'll cast. Brace yourselves for a horrible hack!
// TODO find a proper fix.
Iterator it = map.keySet().iterator();
TreeMap<Long, Long> treeMap = new TreeMap<>();
while (it.hasNext()) {
Object key = it.next();
Object value = map.get(key);
Long lKey, lValue;
if ((key instanceof Long)) {
lKey = (Long) key;
} else {
Log.e(TAG, "Invalid key type in TreeMap: " + key.getClass());
if (key instanceof Number) {
lKey = ((Number) key).longValue();
} else if (key instanceof String) {
lKey = Double.valueOf((String) key).longValue();
} else {
throw new IllegalArgumentException("Invalid key in TreeMap: " + key);
}
}
if ((value instanceof Long)) {
lValue = (Long) value;
} else {
Log.e(TAG, "Invalid value type in TreeMap: " + value.getClass());
if (value instanceof Number) {
lValue = ((Number) value).longValue();
} else if (value instanceof String) {
lValue = Double.valueOf((String) value).longValue();
} else {
throw new IllegalArgumentException("Invalid value in TreeMap: " + value);
}
}
treeMap.put(lKey, lValue);
}
return treeMap;
}