首先，我能够将存储在SQLite数据库中的图像路径加载到Gridview中，但我似乎无法找到一种基于SQLite数据库获取图像路径位置的方法带有onClicklistener的Gridview中的row_ID用于删除目的。
我试过这个：
//CHECKBOXES ONCLICKLISTENER
AdapterView.OnItemClickListener Checkbox_MulClickListener = new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
adapter.changeSelection(v, position);
System.out.println("position : " + position);
return;
}
};
但无论SQLite数据库的row_ID如何，它总是从0开始给我一个位置。
我的目标是根据SQLite数据库中的row_ID，使用onClicklistener从Gridview获取图像路径的位置。
例如，
SQLite数据库：
ROW_ID：
3
4
5
当我点击Gridview中的图片时，
它会给我从3而不是0开始的row_id。
SQLite_Database.java：
public class SQLite_Database extends SQLiteOpenHelper {
private static final String KEY_ID = "ROW_ID";
private static final String KEY_IMAGE = "image_file";
private static final String DATABASE_NAME = "imagesdb";
private static final int DATABASE_VERSION = 1;
private static final String IMAGES_TABLE_NAME = "images";
private static final String IMAGES_TABLE_CREATE =
"CREATE TABLE " + IMAGES_TABLE_NAME + "("+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_IMAGE + " TEXT);";
ViewSwitcher viewSwitcher;
Gallery_Adapter_Activity adapter;
public SQLite_Database(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(IMAGES_TABLE_CREATE);
db.execSQL(COUNT_TABLE_CREATE);
}
public void addImageFile(String file) {
ContentValues values = new ContentValues();
values.put(KEY_IMAGE, file);
getWritableDatabase().insert(IMAGES_TABLE_NAME, null, values);
}
public ArrayList<SDcardPath_Activity> readImageFiles() { //(0) //(1)
Cursor cursor = getReadableDatabase().query(IMAGES_TABLE_NAME, new String[] { KEY_ID, KEY_IMAGE }, null,
null, null, null, null);
try {
if (!cursor.moveToFirst()) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(IMAGES_TABLE_NAME, null, null);
db.close();
}
ArrayList<SDcardPath_Activity> sdcardPath_SQLite_Path = new ArrayList<SDcardPath_Activity>();
do {
String SQ_single_key_id = cursor.getString(0);
String SQ_single_path = cursor.getString(1);
Shared_Data_Class shared_data_class = new Shared_Data_Class(); SDcardPath_Activity SQ_SDcardPath_Class = new SDcardPath_Activity();
shared_data_class.putID(Integer.parseInt(SQ_single_key_id));
SQ_SDcardPath_Class.sdcardPath = SQ_single_path;
sdcardPath_SQLite_Path.add(SQ_SDcardPath_Class);
} while (cursor.moveToNext());
return sdcardPath_SQLite_Path;
}
finally {
cursor.close();
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
// on upgrade drop older tables
db.execSQL("DROP TABLE IF EXISTS " + IMAGES_TABLE_CREATE);
// create new tables
onCreate(db);
}
// Deleting single SQLite_data
public void delete_SQLite_data(Shared_Data_Class shared_data_class) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(IMAGES_TABLE_NAME, KEY_ID + " = ?", new String[] {
String.valueOf(shared_data_class.read_String_method()) });
db.close();
}
}
Image_MainActivity.java：
public class Image_MainActivity extends Activity {
ArrayList<Shared_Data_Class> Shared_Data_Class_DATA = new ArrayList<Shared_Data_Class>();
GridView gridGallery;
Handler handler;
Gallery_Adapter_Activity adapter;
Button add_images_btn;
ViewSwitcher viewSwitcher;
ImageLoader imageLoader;
SQLite_Database SQ_LITE_DATABASE;
int add_image_count;
int result_requestcode = 542182;
public boolean isSeleted;
public String sdcardPath;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
initImageLoader();
init();
//Initialize other classes (or else error will occur)
SQ_LITE_DATABASE = new SQLite_Database(Image_MainActivity.this);
//LOAD IMAGE PATHS FROM SQLITE_DATABASE TO THE GRIDVIEW
try {
ArrayList<SDcardPath_Activity> SQLite_Databse_Data = SQ_LITE_DATABASE.readImageFiles();
viewSwitcher.setDisplayedChild(0);
adapter.addAll(SQLite_Databse_Data);
} catch (Exception e)
{
e.printStackTrace();
return;
}
Button delete = (Button) findViewById(R.id.delete);
delete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
}
private void initImageLoader() {
@SuppressWarnings("deprecation")
DisplayImageOptions defaultOptions = new DisplayImageOptions.Builder().cacheOnDisc().imageScaleType
(ImageScaleType.EXACTLY_STRETCHED).bitmapConfig(Bitmap.Config.RGB_565).build();
ImageLoaderConfiguration.Builder builder = new ImageLoaderConfiguration.Builder(
this).defaultDisplayImageOptions(defaultOptions).memoryCache(new WeakMemoryCache());
ImageLoaderConfiguration config = builder.build();
imageLoader = ImageLoader.getInstance();
imageLoader.init(config);
}
//CHECKBOXES ONCLICKLISTENER
AdapterView.OnItemClickListener Checkbox_MulClickListener = new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
adapter.changeSelection(v, position);
System.out.println("position : " + position);
return;
}
};
private void init() {
handler = new Handler();
gridGallery = (GridView) findViewById(R.id.main_gridGallery);
gridGallery.setFastScrollEnabled(true); //To have fast scroll bar on the screen
adapter = new Gallery_Adapter_Activity(getApplicationContext(), imageLoader);
gridGallery.setOnItemClickListener(Checkbox_MulClickListener); //for checkboxes OnItemClickListener
adapter.setMultiplePick(true); //Turn on checkboxes in Image_MainActivity Class
gridGallery.setAdapter(adapter);
viewSwitcher = (ViewSwitcher) findViewById(R.id.viewSwitcher);
viewSwitcher.setDisplayedChild(1);
Button done_button = (Button) findViewById(R.id.done);
done_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) { //Done Button OnClickListener
finish();
}
});
add_images_btn = (Button) findViewById(R.id.add_images_button);
add_images_btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) { //Add Images Button OnClickListener
Intent i = new Intent(Multiple_Pick_Activity.ACTION_MULTIPLE_PICK);
startActivityForResult(i, result_requestcode);
//result_requestcode is the sent code. The request code must match
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
//result_requestcode is the sent code. The request code must match
if (requestCode == result_requestcode && resultCode == Activity.RESULT_OK)
//RESULT_OK is from Gallery_View_Activity
{
SDcardPath_Activity SDcardPath_Class = new SDcardPath_Activity();
String[] ALL_Paths = data.getStringArrayExtra("all_path");
for (String single_path : ALL_Paths)
{
SQ_LITE_DATABASE.addImageFile(single_path); // Add single_path to method addImageFile() {
// in SQLite_Database class
}
try {
ArrayList<SDcardPath_Activity> SQLite_Databse_Data = SQ_LITE_DATABASE.readImageFiles();
SQLite_Databse_Data.add(SDcardPath_Class);
viewSwitcher.setDisplayedChild(0);
adapter.addAll(SQLite_Databse_Data);
Intent intent = new Intent (Image_MainActivity.this, Image_MainActivity.class);
startActivity(intent);
finish();
} catch (Exception e)
{
e.printStackTrace();
return;
}
}
}
如果有人可以帮助我，我们将不胜感激。
非常感谢。
编辑：添加
Gallery_Adapter_Activity.java
@Override
public int getCount() {
return data.size();
}
@Override
public SDcardPath_Activity getItem(int position) {
return data.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
public void setMultiplePick(boolean isMultiplePick) {
this.isActionMultiplePick = isMultiplePick;
}
public void selectAll(boolean selection) {
for (int i = 0; i < data.size(); i++) {
data.get(i).isSeleted = selection;
}
notifyDataSetChanged();
}
答案 0 :(得分：1)
您应该将适配器传递给模型对象的arraylist;称之为myArray。使用具有对所需路径的引用的模型对象填充数组。然后你可以调用myArray.get（position），它会给你一个模型对象;称之为myObject。然后调用myObject.getPath（）。
模型对象：您创建的具有要检索的密切相关数据的类（请参阅http://www.javapractices.com/topic/TopicAction.do?Id=187），在这种情况下，它将引用图片位置。您应该为每个字段输入模型类setter和getter。您的类将有一个字段，其中包含对图像路径的引用。
类似的东西：
class MyPic {
private String path;
public MyPic(String path){
this.path = path;
}
public getPath(){
return path;
}
etc . . .
}