在我的第一个活动中，我有一个ListView从数据库（SQLite）获取数据。 我可以在ListView上显示描述（例如购买圣诞礼物，购买火鸡......）。
public class OpenHelper extends SQLiteOpenHelper {
public static final String NAME = "oef.db";
public static final int VERSION = 1;
public OpenHelper(Context context) {
super(context, NAME, null, VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
onUpgrade(db, 1, VERSION);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
String sqlCreateTodo = "CREATE TABLE TODOS (_id INTEGER PRIMARY KEY AUTOINCREMENT, description TEXT, reason TEXT, image TEXT)";
db.execSQL(sqlCreateTodo);
String sqlInsertTodo = "INSERT INTO TODOS (description, reason, image) VALUES(?,?,?)";
db.execSQL(sqlInsertTodo, new Object[] { "Buy Christmas presents.", "Family", "ic_launcher" });
db.execSQL(sqlInsertTodo, new Object[] { "Buy turkey.", "Family", "ic_launcher" });
db.execSQL(sqlInsertTodo, new Object[] { "Buy beer.", "Me", "ic_launcher" });
db.execSQL(sqlInsertTodo, new Object[] { "Buy more beer.", "Me", "ic_launcher" });
db.execSQL(sqlInsertTodo, new Object[] { "Buy tree.", "Family", "ic_launcher" });
}
}
第一个问题：我还希望在MainActivity上显示图片和原因。 （图片 - 描述 - 原因）
public class MainActivity extends ListActivity implements LoaderCallbacks<Cursor>{
private static final int TEST_LOADER = 0;
private SimpleCursorAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_main);
String[] from = new String[] { "description" };
int[] to = new int[] { android.R.id.text1 };
adapter = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_1, null, from, to, 0);
setListAdapter(adapter);
getLoaderManager().initLoader(TEST_LOADER, null, this);
//listtest.setOnItemClickListener(new AdapterView.OnItemClickListener() {
//ListView listtest = (ListView) findViewById(R.id.list);
ListView lv = getListView();
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> adapter, View view, int position, long id){
Intent intent = new Intent(MainActivity.this, Detail.class);
intent.putExtra("id", id);
startActivity(intent);
// startActivityForResult(intent, 0);
}
});
}
@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
if (id == TEST_LOADER){
SQLiteCursorLoader cursorLoader = new SQLiteCursorLoader(this, new OpenHelper(this), "SELECT _id, description FROM TODOS", null);
return cursorLoader;
}
return null;
}
@Override
public void onLoadFinished(Loader<Cursor> arg0, Cursor arg1) {
adapter.swapCursor(arg1);
}
@Override
public void onLoaderReset(Loader<Cursor> arg0) {
adapter.swapCursor(null);
}
}
第二个问题：当点击ListView中的项目时，我想将该项目的数据传递给第二个活动。在控件中显示图像，描述和原因。 （例如，当点击第一行时 - ＆gt; myDescription text =购买圣诞礼物，myReason tex = family，myImage =设置背景图片）
<ImageView
android:id="@+id/myImage"
android:layout_width="100dp"
android:layout_height="100dp"
android:contentDescription="@string/hello_world"
android:layout_marginTop="5dp"
android:layout_centerHorizontal="true"
android:src="@drawable/ic_launcher" />
<TextView
android:id="@+id/myDescription"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="@string/hello_world" />
<TextView
android:id="@+id/myReason"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/myDescription"
android:layout_below="@+id/myDescription"
android:layout_marginTop="57dp"
android:text="@string/hello_world" />
第二项活动：
public class Detail extends Activity {
public static String[] DESCRIPTION = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail);
Bundle b = new Bundle();
b = getIntent().getExtras();
long id = b.getLong("id");
TextView t = new TextView(this);
t =(TextView)findViewById(R.id.myDescription);
t.setText(String.valueOf(id));
/* TextView t = new TextView(this);
t =(TextView)findViewById(R.id.myDescription);
t.setText("Show description"); */
TextView t1 = new TextView(this);
t1 =(TextView)findViewById(R.id.myReason);
t1.setText("Show reason");
//Show the correct image
ImageView image = new ImageView(this);
image = (ImageView)findViewById(R.id.myImage);
// .... image.setBackground
//image.setBackgroundResource(R.drawable.ic_launcher);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.detail, menu);
return true;
}
}
对于第二个问题，我可能需要查询数据库？谢谢你们！
答案 0 :(得分：1)
您可以创建一个Hashmap，将其用作列表视图的适配器。
ArrayList<HashMap<String, String>> yourlist = new ArrayList<HashMap<String, String>>();
HashMap<String,String> hm = new HashMap<String,String>();
hm.put("description",description);
yourlistview.add(hm);
如果您想要显示图片，只需确保您的xml中有一个imageview，这样就可以执行以下操作：
String[] from = { "image","some text","some other text" };
//Id(s of the views in your listviewlayout
int[] to = { R.id.image,R.id.sometext,R.id.someothertext};
SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), yourlist, R.layout.listview_layout, from, to);
在itemclick事件中，您可以访问以下项目：
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
HashMap<String, String> map = (HashMap<String, String>) yourlistview.getItemAtPosition(position);
yourlistview.getItemAtPosition(position);
Intent intent = new Intent(MainActivity.this, Detail.class);
intent.putExtra("description", map.get("description"));
...
}
答案 1 :(得分：0)
您可以创建一个包含数据的对象，然后将整个对象传递给第二个活动。您可以查看here以在活动之间传递对象。
答案 2 :(得分：0)
由于您正在使用CursorAdapter，因此列表视图包含光标，该光标包含您从数据库查询并存储在适配器中的项目。因此，listitemclicklistener中的lv.getItemAtPosition（position）将返回指向所选＆＃39;位置的项目的光标。从游标中，您可以使用cursor.getString（）获取所需的值。