如何在android中使用广播接收器调用接口

Question

我想使用广播接收器在固定时间调用此方法的警报

/**
 * Delete all messages
 */
private void performDeleteAll() {
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder.setMessage(getString(R.string.confirm_message))
            .setCancelable(false)
            .setNegativeButton(getString(R.string.confirm_no),
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            dialog.cancel();
                        }
                    })
            .setPositiveButton(getString(R.string.confirm_yes),
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            // delete all messages
                            mHandler.post(mDeleteAllMessages);
                            adapter.refresh();
                        }
                    });
    AlertDialog alert = builder.create();
    alert.show();

}

删除所有消息，但没有发生，请提前帮我谢谢

/***删除所有消息。0-成功删除。1-没有要*删除的内容。*/

final Runnable mDeleteAllMessages = new Runnable() {
    public void run() {
        getActivity().setProgressBarIndeterminateVisibility(true);
        boolean result = false;

        int deleted = 0;

        if (adapter.getCount() == 0) {
            deleted = 1;
        } else {
            result = model.deleteAllMessages();
        }

        try {
            if (deleted == 1) {
                toastLong(R.string.no_messages_to_delete);
            } else {
                if (result) {

                    toastLong(R.string.messages_deleted);
                    showMessages();
                } else {
                    toastLong(R.string.messages_deleted_failed);
                }
            }
            getActivity().setProgressBarIndeterminateVisibility(false);
        } catch (Exception e) {
            return;
        }
    }
};

我正在使用这个广播接收器

public class AlarmReceiver extends BroadcastReceiver implements Runnable {

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        Toast.makeText(context, "Import Messages Invoke ",Toast.LENGTH_LONG).show();
    //  context.startService(new Intent(context,ImportMessagesTask.class));

        MessagesModel.deleteAllMessages();{
    //   new MessagesModel().deleteAllMessages();

        Database.mMessagesContentProvider.deleteAllMessages();
        }

    //  mHandler.post(mDeleteAllMessages);
    //  adapter.refresh();

正如你所说我做了我创建了一个活动

公共类Active扩展PendingMessages实现Runnable{

/**
 * Delete all messages. 0 - Successfully deleted. 1 - There is nothing to be
 * deleted.
 */

@Override
public void run() {
    // TODO Auto-generated method stub
    getActivity().setProgressBarIndeterminateVisibility(true);
    boolean result = false;

    int deleted = 0;

    if (adapter.getCount() == 0) {
        deleted = 1;
    } else {
        result = model.deleteAllMessages();
    }

    try {
        if (deleted == 1) {
            toastLong(R.string.no_messages_to_delete);
        } else {
            if (result) {

                toastLong(R.string.messages_deleted);
                showMessages();
            } else {
                toastLong(R.string.messages_deleted_failed);
            }
        }
        getActivity().setProgressBarIndeterminateVisibility(false);
    } catch (Exception e) {
        return;
    }
}

}

然后打电话过去

context.start服务（新意图（上下文，Activity.class））；

但它不工作，然后我打电话给它

上下文startActivity（新意图（上下文、活动、类））；

然后它的力量关闭，我没有得到任何帮助，请让我更正，提前谢谢

Answer 1

实际上，问题是我想在后台运行UI，但在Android中不可能。然后我使用服务在后台运行

Answer 2

无法从广播接收器显示UI。

将上述代码放入活动中，并从BroadcastReceiver启动活动

编辑：使用

context.startActivity(intent);

启动活动