小编Utk*_*tku的帖子

我正在尝试在ListFragment中显示数据库中的数据.为此,我在使用ListActivity时遵循相同的方式,创建了自己的适配器(适配器可能看起来很奇怪,我从一个在我的旧项目中扩展BaseAdapter的类转换它):

package com.mysys.asistan;

import android.app.ListFragment;
import android.content.Context;
import android.database.DataSetObserver;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListAdapter;
import android.widget.TextView;

import com.mysys.asistan.database.Company;

public class CompanyListFragment extends ListFragment {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setListAdapter(new CompanyListAdapter(getActivity()));
    }

    private class CompanyListAdapter implements ListAdapter {

        private final Context context;
        private DatabaseHelper dbHelper;

        public CompanyListAdapter(Context context) {
            this.context = context;
            this.dbHelper = new DatabaseHelper(context);
        }

        public int getCount() {
            return dbHelper.getCompanyCount();
        }

        public Object getItem(int position) {
            return dbHelper.getAllCompanies().get(position);
        }

        public …

我正在尝试DirectRunner在Google Cloud Dataflow上运行能够成功运行的管道。当我执行此Maven命令时：

mvn compile exec:java \
    -Dexec.mainClass=com.example.Pipeline \
    -Dexec.args="--project=project-name \
    --stagingLocation=gs://bucket-name/staging/ \
    ... custom arguments ...
    --runner=DataflowRunner"

我收到以下错误：

No Runner was specified and the DirectRunner was not found on the classpath.
[ERROR] Specify a runner by either:
[ERROR]     Explicitly specifying a runner by providing the 'runner' property
[ERROR]     Adding the DirectRunner to the classpath
[ERROR]     Calling 'PipelineOptions.setRunner(PipelineRunner)' directly

我有意DirectRunner从我的收藏夹中删除pom.xml并添加了以下内容：

<dependency>
    <groupId>org.apache.beam</groupId>
    <artifactId>beam-runners-google-cloud-dataflow-java</artifactId>
    <version>2.0.0</version>
    <scope>runtime</scope>
</dependency>

我继续删除了<scope>标签，然后调用了options.setRunner(DataflowRunner.class)，但没有帮助。PipelineOptions从扩展我自己的界面DataflowPipelineOptions …