android - java.lang.ClassCastException : java. io.File 无法转换为 android.os.Parcelable

Question

我正在尝试创建文本文件并共享它(通过蓝牙、电子邮件......)

File file = null;
try {
    file = createFile2(json);
} catch (IOException e) {
    e.printStackTrace();
}

Intent shareIntent = new Intent();
shareIntent.setAction(Intent.ACTION_SEND);
shareIntent.putExtra(Intent.EXTRA_STREAM, file);
shareIntent.setType(getString(R.string.share_contact_type_intent));

这是 createFile2() 的乐趣:

 public File createFile2(String text) throws IOException {
        File file = new
                File(getFilesDir() + File.separator + "MyFile.txt");

        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(file));
        bufferedWriter.write(text);
        bufferedWriter.close();
        return file;
    }

日志:

Bundle﹕ Key android.intent.extra.STREAM expected Parcelable but value was a java.io.File.  The default value <null> was returned.
Bundle﹕ Attempt to cast generated internal exception:
    java.lang.ClassCastException: java.io.File cannot be cast to android.os.Parcelable
            at android.os.Bundle.getParcelable(Bundle.java:1212)
            at android.content.Intent.getParcelableExtra(Intent.java:4652)
            at android.content.Intent.migrateExtraStreamToClipData(Intent.java:7235)
            at android.content.Intent.migrateExtraStreamToClipData(Intent.java:7219)
            at android.app.Instrumentation.execStartActivity(Instrumentation.java:1417)
            at android.app.Activity.startActivityForResult(Activity.java:3424)
            at android.app.Activity.startActivityForResult(Activity.java:3385)

Answer 1

当为 ACTION_SEND Intent 填充 EXTRA_STREAM 时，您必须为资源提供 Uri，而不是 File 对象本身。

至于异常(exception):虽然通常您可以将File对象作为Intent的扩展数据的一部分(因为它实现 Serializable)，接收方需要 EXTRA_STREAM 的 Parcelable 实例，而 File 不是。