Question

我试图从我的SQLite数据库中获取一些数据到我的(ptr + i)->roll。现在，当应用程序启动时，我的数据库中的数据会加载到ListView，所以我相信我正在走上正轨。我无法将数据放入Toast。我已经查看了一些教程，但我仍然不确定。这是我的ListView课程：

OverviewActivity.java

这是我的public class OverviewActivity extends ListActivity implements View.OnClickListener { private DBAdapter dbAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.overview_activity); dbAdapter = new DBAdapter(this); dbAdapter.open(); Cursor c = dbAdapter.getAllValues(); if (c.moveToFirst()) { do { DisplayTitle(c); } while (c.moveToNext()); } } public void DisplayTitle(Cursor c) { Toast.makeText(this, "id: " + c.getString(0) + "\n" + "Number: " + c.getString(1) + "\n" + "Name: " + c.getString(2) + "\n" + "Version: " + c.getString(3) + "\n" + "Method: " + c.getString(4) + "\n" + "Chain Number: " + c.getString(5) + "\n" + "Caught: " + c.getString(6) + "\n", Toast.LENGTH_LONG).show(); } @Override public void onClick(View view) { //TODO: AUTOGENERATED METHOD } @Override public void onDestroy(){ super.onDestroy(); dbAdapter.close(); } @Override public boolean onCreateOptionsMenu(Menu menu){ MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.menu, menu); return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.menu_add: Intent intent = new Intent(OverviewActivity.this, VersionMethodActivity.class); startActivity(intent); break; } return false; } }课程：

DBAdapter.java

有关如何实现这一目标的任何建议吗？

Answer 1

假设您对数据库中的每个列使用TextView，则可以在加载ListView的活动中使用以下代码：

DBAdapter db = new DBAdapter(this);
Cursor cursor = db.getAllValues();

// The columns that you want to bind
String[] columns = new String[] {
    db.KEY_NUMBER,
    db.KEY_NAME,
    db.KEY_VERSION,
    db.KEY_METHOD,
    db.KEY_CHAIN_NUMBER,
    db.KEY_CAUGHT
};

// The IDs of the TextViews you want to bind the columns with
int[] to = new int[] { 
    R.id.number,
    R.id.name,
    R.id.version,
    R.id.method,
    R.id.chain_number,
    R.id.caught
};

// Attach the layout file and the columns to the ListView
SimpleCursorAdapter adapter = new SimpleCursorAdapter(
    this, 
    R.layout.your_listview_layout, 
    cursor, 
    columns, 
    to,
    0);

ListView listView = (ListView) findViewById(R.id.your_listview);
// Assign the adapter to the ListView
listView.setAdapter(dataAdapter);

确保您拥有ListView的布局文件。您可能需要更改此代码以满足您的需求。如果您有任何疑问，请在下面评论。

将数据从SQLite数据库加载到ListView中

1 个答案: