Question

我正在使用sql listview，但是我想在tablayout中将listview作为活动类（CountryListActivity.java）显示为片段。 dbManager = newDBManager（this）在将其更改为getActivity时出错，我该如何解决？

$ scalac -help
Usage: scalac <options> <source files>
where possible standard options include:
  -X                              Print a synopsis of advanced options.


$ scalac -X
Usage: scalac <options> <source files>

-- Notes on option parsing --
Boolean settings are always false unless set.
Where multiple values are accepted, they should be comma-separated.
  example: -Xplugin:option1,option2
<phases> means one or a comma-separated list of:
  (partial) phase names, phase ids, phase id ranges, or the string "all".
  example: -Xprint:all prints all phases.
  example: -Xprint:expl,24-26 prints phases explicitouter, closelim, dce, jvm.
  example: -Xprint:-4 prints only the phases up to typer.

Possible advanced options include:
  -Xlint:<_,warning,-warning>    Enable or disable specific warnings: `_' for all, `-Xlint:help' to list

数据库管理器类如下：

package com.trinitytabnavigationdrawer;

import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.widget.SimpleCursorAdapter;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.TextView;

public class CountryListActivity extends ActionBarActivity {

    private DBManager dbManager;

    private ListView listView;

    private SimpleCursorAdapter adapter;

    final String[] from = new String[] {
        DatabaseHelper._ID,
            DatabaseHelper.SUBJECT, DatabaseHelper.DESC
    };

    final int[] to = new int[] {
        R.id.id, R.id.title, R.id.desc
    };

    @
    Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.fragment_emp_list);

        dbManager = new DBManager(this);
        dbManager.open();
        Cursor cursor = dbManager.fetch();

        listView = (ListView) findViewById(R.id.list_view);
        listView.setEmptyView(findViewById(R.id.empty));

        adapter = new SimpleCursorAdapter(this, R.layout.activity_view_record, cursor, from, to, 0);
        adapter.notifyDataSetChanged();

        listView.setAdapter(adapter);

        // OnCLickListiner For List Items
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {@
            Override
            public void onItemClick(AdapterView <? > parent, View view, int position, long viewId) {
                TextView idTextView = (TextView) view.findViewById(R.id.id);
                TextView titleTextView = (TextView) view.findViewById(R.id.title);
                TextView descTextView = (TextView) view.findViewById(R.id.desc);

                String id = idTextView.getText().toString();
                String title = titleTextView.getText().toString();
                String desc = descTextView.getText().toString();

                Intent modify_intent = new Intent(getApplicationContext(), ModifyCountryActivity.class);
                modify_intent.putExtra("title", title);
                modify_intent.putExtra("desc", desc);
                modify_intent.putExtra("id", id);

                startActivity(modify_intent);
            }
        });
    }

    @
    Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @
    Override
    public boolean onOptionsItemSelected(MenuItem item) {

        int id = item.getItemId();
        if (id == R.id.add_record) {

            Intent add_mem = new Intent(this, AddCountryActivity.class);
            startActivity(add_mem);

        }
        return super.onOptionsItemSelected(item);
    }

}

我不知道还能做什么！已经尝试了一个星期了，对不起，我不擅长这个，只是按照一些教程！：（

Answer 1

初始化dbManager和其他需要onAttach (Context context)内的上下文而不是onCreateView() Fragment方法的对象。

如何将此活动转换为片段？

1 个答案: