java - 出现内存不足错误

Question

我正在尝试将 12mb txt 文件作为 HashMap 加载到内存中，以供应用程序使用它，但我收到了 OutOfMemoryError

09-27 15:42:17.560: ERROR/AndroidRuntime(19030):     ... 11 more
09-27 15:42:17.560: ERROR/AndroidRuntime(19030): Caused by: java.lang.OutOfMemoryError
09-27 15:42:17.560: ERROR/AndroidRuntime(19030):     at java.util.HashMap.makeTable(HashMap.java:559)
09-27 15:42:17.560: ERROR/AndroidRuntime(19030):     at java.util.HashMap.doubleCapacity(HashMap.java:579)
09-27 15:42:17.560: ERROR/AndroidRuntime(19030):     at java.util.HashMap.put(HashMap.java:409)
09-27 15:42:17.560: ERROR/AndroidRuntime(19030):     at org.com.SentencesActivity.loadBigramFrequencies(SentencesActivity.java:151)
09-27 15:42:17.560: ERROR/AndroidRuntime(19030):     at org.com.SentencesActivity.onClick(SentencesActivity.java:56)

有什么办法可以解决吗，还是dalvik vm的限制？

将文件加载到内存的代码:

public HashMap<String, Double> loadBigramFrequencies() throws IOException {
        AssetManager assetManager = getAssets();

        HashMap<String, Double> bigramFrequencies = new HashMap<String, Double>();
        String[] splittedLine;
        try {
            // open the file for reading
            InputStream instream = assetManager.open("bigramFrequencies.txt");

            // if file the available for reading
            if (instream != null) {
                // prepare the file for reading
                InputStreamReader inputreader = new InputStreamReader(instream);
                BufferedReader buffreader = new BufferedReader(inputreader);

                String line;

                // read every line of the file into the line-variable, on line
                // at the time
                while ((line = buffreader.readLine()) != null) {
                    // do something with the settings from the file
                    splittedLine = line.split("\\#");
                    bigramFrequencies.put(splittedLine[0].trim(),
                            Double.parseDouble(splittedLine[1].trim()));
                }
                Log.v(LOG_TAG, "bigram frequencies loaded");

            }

            // close the file again
            instream.close();

        } catch (java.io.FileNotFoundException e) {
            // do something if the myfilename.txt does not exits
        }

        return bigramFrequencies;
    }

Answer 1

读取内存中的 12mb 文件会降低设备速度。对于普通电脑来说，12MB 听起来可能比较少，但大多数 Android 手机的 RAM 都少于 512MB。

您应该能够重新格式化文件或将其拆分，以便应用程序可以在需要时读取必要的部分。

此外，使用 SQLite Database可能更适合加快整个过程。