putParcelableArrayListExtra(ArrayList<Uri>) 抛出 ArrayList 不能强制转换为 android.os.Parcelable

Question

我想添加多个图像作为电子邮件的附件。因此，我尝试将java.util.ArrayList添加到电子邮件Intent中。该列表包含android.net.Uri元素。但它抛出了一个ClassCastException:

java.lang.ClassCastException: java.util.ArrayList cannot be cast to android.os.Parcelable
 at android.os.Bundle.getParcelable(Bundle.java:792)
 at android.content.Intent.getParcelableExtra(Intent.java:5377)
 at android.content.Intent.migrateExtraStreamToClipData(Intent.java:8144)
 at android.content.Intent.migrateExtraStreamToClipData(Intent.java:8124)
 at android.app.Instrumentation.execStartActivity(Instrumentation.java:1505)
 at android.app.Activity.startActivityForResult(Activity.java:3917)
 at android.app.Activity.startActivityForResult(Activity.java:3877)
 at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:843)
 at android.app.Activity.startActivity(Activity.java:4200)
 at android.app.Activity.startActivity(Activity.java:4168)
 at de.zinnet.parkingoffenders.ParkingOffendersActivity.sendEmail(ParkingOffendersActivity.java:135)
 at de.zinnet.parkingoffenders.ParkingOffendersActivity.onOptionsItemSelected(ParkingOffendersActivity.java:103)
 at android.app.Activity.onMenuItemSelected(Activity.java:2908)
 at android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:404)

我尝试了Intent的不同类型。我调用的方法创建Intent并启动Activity:

private void sendEmail() {
    ParkingOffendersListFragment fragment = (ParkingOffendersListFragment) getFragmentManager().findFragmentById(R.id.fragment_list);
    Intent emailIntent = new Intent(Intent.ACTION_SEND);
    emailIntent.setType("text/plain");
    SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
    String[] to = {settings.getString(getResources().getString(R.string.key_receiver_mail), "")};
    emailIntent .putExtra(Intent.EXTRA_EMAIL, to);
    String subject = settings.getString(getResources().getString(R.string.key_subject_mail), "");
    emailIntent.putExtra(Intent.EXTRA_SUBJECT, subject);
    String text = settings.getString(getResources().getString(R.string.key_template_mail), "");
    emailIntent.putExtra(Intent.EXTRA_TEXT, text);
    ArrayList<Parcelable> uris = new ArrayList<>();
    ParkingOffendersListAdapter adapter = fragment.getAdapter();
    for(ParkingOffender parkingOffender : adapter.getSelectedItems()) {
        if(parkingOffender.getImageFilePath() != null) {
            uris.add(Uri.parse(parkingOffender.getImageFilePath()));
        }
    }
    emailIntent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris);
    startActivity(Intent.createChooser(emailIntent , "Send email..."));
}

我找不到解决办法。这并没有解决我的问题。

Answer 1

ACTION_SEND支持EXTRA_STREAM，但仅适用于单个Uri。ACTION_SEND_MULTIPLE通过ArrayList<Uri>支持EXTRA_STREAM。所以，要么改变动作，要么改变额外的动作。

Answer 2

尝试将Strings的ArrayList作为Intent的额外值，然后当从下一个Activity获取额外值时，只需将其解析回Uris即可。

请参阅此答案