我有一個問題,即,我有一個應用程序顯示在RecyclerView 2類型的沙拉,並按後,其中一個應該顯示一個視圖顯示其確切的細節,我們不喜歡它。這些數據顯然是從數據庫中檢索的。而且一切都有效,直到我們進入詳細視圖 - 當我們點擊希臘沙拉的圖片時,我們看到一片空白的景色,但是當點擊雞肉沙拉時,我們只能看到希臘沙拉的景色,有趣的是什麼?那麼雞肉沙拉的視角在哪裏?爲什麼這些觀點變成了地方。我將底部的代碼附在圖片上,以便您可以準確理解問題所在。數據庫不能正確顯示數據
DatabaseHelper
public class DatabaseHelper extends SQLiteOpenHelper {
private static final String DB_NAME = "app";
private static final int DB_VERSION = 1;
public MiodzioDatabaseHelper(Context context) {
super(context, DB_NAME, null, DB_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE SALAD (_id INTEGER PRIMARY KEY AUTOINCREMENT, "
+ "NAME TEXT, "
+ "IMAGE_RESOURCE_ID INTEGER, "
+ "FAVORITE INTEGER);");
insertSalatki(db, "Greek salad", R.drawable.salad_greek, 0);
insertSalatki(db, "Chicken salad", R.drawable.salad_chicken, 0);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
private static void insertSalatki(SQLiteDatabase db, String name, int resourceId, int favorite){
ContentValues saladValues = new ContentValues();
salatkiValues.put("NAME", name);
salatkiValues.put("IMAGE_RESOURCE_ID", resourceId);
salatkiValues.put("Favorite", favorite);
db.insert("SALAD", null, salatkiValues);
}
}
沙拉
public class Salad {
private String name;
private int imageResourceId;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getImageResourceId() {
return imageResourceId;
}
public void setImageResourceId(int imageResourceId) {
this.imageResourceId = imageResourceId;
}
}
SaladDe tailActivity
public class SaladDetailActivity extends AppCompatActivity {
public static final String EXTRA_SALAD = "salad";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_salatki_detail);
int salads = (Integer) getIntent().getExtras().get(EXTRA_SALAD);
try {
SQLiteOpenHelper miodzioDatabaseHelper = new MiodzioDatabaseHelper(this);
SQLiteDatabase db = miodzioDatabaseHelper.getWritableDatabase();
Cursor cursor = db.query("SALATKI",
new String[]{"NAME", "IMAGE_RESOURCE_ID", "FAVORITE"},
"_id = ?",
new String[]{Integer.toString(salads)},
null, null, null);
if(cursor != null) {
if (cursor.moveToFirst()) {
do {
String nameText = cursor.getString(0);
int photoId = cursor.getInt(1);
boolean isFavorite = (cursor.getInt(2) == 1);
TextView name = (TextView) findViewById(R.id.salad_text);
name.setText(nameText);
ImageView photo = (ImageView) findViewById(R.id.salad_image);
photo.setImageResource(photoId);
photo.setContentDescription(nameText);
CheckBox favorite = (CheckBox) findViewById(R.id.favorite);
favorite.setChecked(isFavorite);
}while (cursor.moveToNext());
}
}
cursor.close();
db.close();
}catch (SQLiteException e){
Toast.makeText(this, "Database does not work!", Toast.LENGTH_SHORT).show();
}
Toolbar myChildToolbar = (Toolbar) findViewById(R.id.my_child_toolbar_salad_detail);
setSupportActionBar(myChildToolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_create_order:
Intent intent = new Intent(this, AddActivity.class);
startActivity(intent);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
public void onFavoriteClicked(View view) {
int salads = (Integer) getIntent().getExtras().get(EXTRA_SALAD);
CheckBox favorite = (CheckBox) findViewById(R.id.favorite);
ContentValues saladValues = new ContentValues();
saladValues.put("FAVORITE", favorite.isChecked());
SQLiteOpenHelper databaseHelper = new DatabaseHelper(this);
SQLiteDatabase db = databaseHelper.getWritableDatabase();
db.update("SALAD", saladValues,
"_id = ?", new String[]{Integer.toString(salads)});
db.close();
}
}
SaladMaterialFragment
public class SaladMaterialFragment extends Fragment {
private DatabaseHelper dataBaseHelper;
private Cursor cursor;
private ArrayList<Salad> arrayList = new ArrayList<>();
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
RecyclerView saladRecyler = (RecyclerView) inflater.inflate(R.layout.fragment_salad_material, container, false);
try{
SQLiteOpenHelper databaseHelper = new databaseHelper(inflater.getContext());
SQLiteDatabase db = databaseHelper.getReadableDatabase();
cursor = db.query("SALAD",
new String[] {"NAME", "IMAGE_RESOURCE_ID"},
null, null, null, null, null);
if(cursor != null){
if(cursor.moveToFirst()){
do{
Salad salads = new Salad();
salad.setName(cursor.getString(0));
salad.setImageResourceId(cursor.getInt(1));
arrayList.add(salad);
}while (cursor.moveToNext());
}
}
}catch (SQLiteException e){
Toast.makeText(inflater.getContext(), "Database does not work!", Toast.LENGTH_SHORT).show();
}
CaptionedImagesAdapter adapter = new CaptionedImagesAdapter(getActivity(), arrayList);
saladRecyler.setAdapter(adapter);
GridLayoutManager gridLayoutManager = new GridLayoutManager(getActivity(), 2);
saladRecyler.setLayoutManager(gridLayoutManager);
adapter.setListener(new CaptionedImagesAdapter.Listener() {
@Override
public void onClick(int position) {
Intent intent = new Intent(getActivity(), SaladDetailActivity.class);
intent.putExtra(SaladDetailActivity.EXTRA_SALAD, position);
getActivity().startActivity(intent);
}
});
return salatkaRecyler;
}
}
SaladDetailLayout
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.hfad.SaladDetailActivity">
<android.support.v7.widget.Toolbar
android:id="@+id/my_child_toolbar_salad_detail"
android:layout_width="match_parent"
android:layout_height="?android:attr/actionBarSize"
android:background="@android:color/holo_green_light"
android:elevation="4dp"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
/>
<TextView
android:id="@+id/salatki_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"/>
<ImageView
android:id="@+id/salad_image"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:adjustViewBounds="true"/>
<CheckBox
android:id="@+id/favorite"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/favorite"
android:onClick="onFavoriteClicked"/>
所以,當我點擊希臘沙拉,我得到一個空的觀點僅與它是否是一個最喜歡的選項。當我點擊雞肉沙拉時,我會看到希臘沙拉。我不知道發生了什麼事?
我沒有看到您的recyclerview或適配器。你確定你在使用它們嗎? – msecilmis
爲我自己說話,但我不認爲我們需要截圖。我希望看到Layout xml內容。 – Barns
@msecilmis 你是對的,我的錯誤兩次,我複製了SaladDetailActivity代碼,我已經修復了,還應該有一個SaladFragment類,它是RecyclerView。我添加了一個RecyclerAdapter類,其中有一個接口偵聽器。 – newActivity21