我正在尝试将数据加载到mArrayAdapter。这有可能吗？
我希望列表看起来就像其他活动中的其他列表一样。
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Startpage.java,
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package com.example.sqltest;
import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.content.res.AssetManager;
import android.graphics.Color;
import android.graphics.Typeface;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class Startpage extends ListActivity {
final Context context = this;
String[] startpage;
private SQLiteAdapter mySQLiteAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
startpage = new String[]{SQLiteAdapter.KEY_CONTENT}; // <--- This returns the word"content"
//startpage = getResources().getStringArray(R.array.startpage); <---- How do I load SQL DATA to here?
setListAdapter(new mArrayAdapter(this, startpage));
mySQLiteAdapter = new SQLiteAdapter(this);
mySQLiteAdapter.openToWrite();
mySQLiteAdapter.deleteAll();
mySQLiteAdapter.insert("this");
mySQLiteAdapter.insert("that");
mySQLiteAdapter.insert("where");
mySQLiteAdapter.close();
getListView().setOnItemClickListener(
new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
switch (position) {
case 0:
Intent int1 = new Intent(view.getContext(),
AndroidSQLite.class);
startActivity(int1);
break;
case 1:
Intent int2 = new Intent(view.getContext(),
AndroidSQLite.class);
startActivity(int2);
break;
case 2:
Intent int3 = new Intent(view.getContext(),
AndroidSQLite.class);
startActivity(int3 );
break;
case 3:
Intent int4 = new Intent(view.getContext(),
AndroidSQLite.class);
startActivity(int4 );
break;
}
}
});
}
public class mArrayAdapter extends ArrayAdapter<String> {
private final Context context;
private final String[] values;
public mArrayAdapter(Context context, String[] values) {
super(context, R.layout.startpage, values);
this.context = context;
this.values = values;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View rowView = inflater.inflate(R.layout.startpage, parent, false);
TextView textView = (TextView) rowView.findViewById(R.id.startpage);
ImageView imageView = (ImageView) rowView.findViewById(R.id.logo);
ListView list = getListView();
list.setOnItemLongClickListener(new OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent,
View view, int position, long id) {
String s = values[position];
System.out.println(s);
if (s.equals("this")) {
Toast.makeText( Startpage.this, getItem(position), Toast.LENGTH_LONG).show();
} else if (s.equals("that")) {
Toast.makeText( Startpage.this, getItem(position), Toast.LENGTH_LONG).show();;
} else if (s.equals("where")) {
Toast.makeText( Startpage.this, getItem(position), Toast.LENGTH_LONG).show();
} else {
Toast.makeText( Startpage.this, getItem(position), Toast.LENGTH_LONG).show();
}
return true;
}
});
textView.setText(values[position]);
Context context1 = context;
AssetManager assetManager = context1.getResources().getAssets();
Typeface typeface = Typeface.createFromAsset(assetManager, (getString(R.string.font1)));
textView.setTextColor(Color.YELLOW);
textView.setTypeface(typeface);
String s = values[position];
System.out.println(s);
if (s.equals("this")) {
imageView.setImageResource(R.drawable.ic_launcher);
} else if (s.equals("that")) {
imageView.setImageResource(R.drawable.ic_launcher);
} else if (s.equals("where")) {
imageView.setImageResource(R.drawable.ic_launcher);
} else {
imageView.setImageResource(R.drawable.ic_launcher);
}
return rowView;
}
}
}
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SQLiteAdapter.java
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package com.example.sqltest;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
public class SQLiteAdapter {
public static final String MYDATABASE_NAME = "MY_DATABASE";
public static final String MYDATABASE_TABLE = "MY_TABLE";
public static final int MYDATABASE_VERSION = 1;
public static final String KEY_ID = "_id";
public static final String KEY_CONTENT = "Content";
//create table MY_DATABASE (ID integer primary key, Content text not null);
private static final String SCRIPT_CREATE_DATABASE =
"create table " + MYDATABASE_TABLE + " ("
+ KEY_ID + " integer primary key autoincrement, "
+ KEY_CONTENT + " text not null);";
private SQLiteHelper sqLiteHelper;
private SQLiteDatabase sqLiteDatabase;
private Context context;
public SQLiteAdapter(Context c){
context = c;
}
public SQLiteAdapter openToRead() throws android.database.SQLException {
sqLiteHelper = new SQLiteHelper(context, MYDATABASE_NAME, null, MYDATABASE_VERSION);
sqLiteDatabase = sqLiteHelper.getReadableDatabase();
return this;
}
public SQLiteAdapter openToWrite() throws android.database.SQLException {
sqLiteHelper = new SQLiteHelper(context, MYDATABASE_NAME, null, MYDATABASE_VERSION);
sqLiteDatabase = sqLiteHelper.getWritableDatabase();
return this;
}
public void close(){
sqLiteHelper.close();
}
public long insert(String content){
ContentValues contentValues = new ContentValues();
contentValues.put(KEY_CONTENT, content);
return sqLiteDatabase.insert(MYDATABASE_TABLE, null, contentValues);
}
public int deleteAll(){
return sqLiteDatabase.delete(MYDATABASE_TABLE, null, null);
}
public Cursor queueAll(){
String[] columns = new String[]{KEY_ID, KEY_CONTENT};
Cursor cursor = sqLiteDatabase.query(MYDATABASE_TABLE, columns,
null, null, null, null, null);
return cursor;
}
public class SQLiteHelper extends SQLiteOpenHelper {
public SQLiteHelper(Context context, String name,
CursorFactory factory, int version) {
super(context, name, factory, version);
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL(SCRIPT_CREATE_DATABASE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
}
}
}
----------------------------------
startpage.xml layout
----------------------------------
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="bottom|left"
android:padding="5dp" >
<ImageView
android:id="@+id/logo"
android:layout_width="50sp"
android:layout_height="50sp"
android:layout_marginLeft="5sp"
android:layout_marginRight="20sp"
android:layout_marginTop="5sp" />
<TextView
android:id="@+id/startpage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:gravity="bottom|left"
android:text="@+id/label"
android:textSize="27sp" />
</LinearLayout>
----------------------------------
main.xml layout
----------------------------------
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ListView
android:id="@+id/contentlist"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
</LinearLayout>
----------------------------------
row.xml layout
----------------------------------
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/text"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="10dip"/>
代码基于on a tutorial。
答案 0 :(得分：1)
调用setListAdapter(new mArrayAdapter(this, startpage));后，您尚未更新适配器的数据源。所有mySQLiteAdapter.<foo>代码只修改数据库中的数据，您再也不会实际检索它并将其交换到适配器中。你所拥有的只是一个包含一个项目的String数组，其值为“content”。
在mArrayAdapter类中添加一个方法：
public void setData(String[] newData) {
values = newData;
notifyDataSetChanged(); // tells the adapter the data has been updated
}
虽然，您可以使用CursorAdapter并使用从查询数据库获得的Cursor来填充列表。您可以查看sdk中的ApiDemos示例项目，了解如何使用CursorAdapter。