android - 可以在 Intent 中传递的字符串数据的最大大小

Question

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Answer 1

我在 Android API 级别 24 上的测试:

            Intent intent = new Intent(MainActivity.this, DetailActivity.class);
//            intent.putExtra("extra", new byte[1024 * 1024]); // 1024 KB = 1048576 B, android.os.TransactionTooLargeException
//            intent.putExtra("extra", new byte[1024 * 512]); // 512 KB = 524288 B, android.os.TransactionTooLargeException
//            intent.putExtra("extra", new byte[1024 * 506]); // 506 KB = 518144 B, android.os.TransactionTooLargeException
//            intent.putExtra("extra", new byte[1024 * 505]); // 505 KB = 517120 B, android.os.TransactionTooLargeException
            intent.putExtra("extra", new byte[1024 * 504]); // 504 KB = 516096 B, OK
            startActivity(intent);

android.os.TransactionTooLargeException https://developer.android.com/reference/android/os/TransactionTooLargeException.html

因为我需要向 Activity 发送大量数据，所以我使用以下解决方案(我知道，它并不完美，但它可以提供帮助):

public class ExtendedDataHolder {

    private static ExtendedDataHolder ourInstance = new ExtendedDataHolder();

    private final Map<String, Object> extras = new HashMap<>();

    private ExtendedDataHolder() {
    }

    public static ExtendedDataHolder getInstance() {
        return ourInstance;
    }

    public void putExtra(String name, Object object) {
        extras.put(name, object);
    }

    public Object getExtra(String name) {
        return extras.get(name);
    }

    public boolean hasExtra(String name) {
        return extras.containsKey(name);
    }

    public void clear() {
        extras.clear();
    }

}

然后在MainActivity中

ExtendedDataHolder extras = ExtendedDataHolder.getInstance();
extras.putExtra("extra", new byte[1024 * 1024]);
extras.putExtra("other", "hello world");

startActivity(new Intent(MainActivity.this, DetailActivity.class));

在 DetailActivity 中

ExtendedDataHolder extras = ExtendedDataHolder.getInstance();
if (extras.hasExtra("other")) {
    String other = (String) extras.getExtra("other");
}