我从github这个源代码中得到了fork https://github.com/quocnguyenvan/food-sqlite-demo
我需要一些帮助 如何全屏添加显示图像？如果我们在食物列表中并单击图像，则图像将以全屏显示
还有一个，如何添加排序文件？因此，最新上传的内容将位于列表的顶部，感谢您帮助我，我需要将其用于我的办公室
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FoodList类
public class FoodList extends AppCompatActivity {
GridView gridView;
ArrayList<Food> list;
FoodListAdapter adapter = null;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.food_list_activity);
gridView = (GridView) findViewById(R.id.gridView);
list = new ArrayList<>();
adapter = new FoodListAdapter(this, R.layout.food_items, list);
gridView.setAdapter(adapter);
// get all data from sqlite
Cursor cursor = MainActivity.sqLiteHelper.getData("SELECT * FROM FOOD");
list.clear();
while (cursor.moveToNext()) {
int id = cursor.getInt(0);
String name = cursor.getString(1);
String price = cursor.getString(2);
byte[] image = cursor.getBlob(3);
list.add(new Food(name, price, image, id));
}
adapter.notifyDataSetChanged();
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {
CharSequence[] items = {"Preview", "Download"};
AlertDialog.Builder dialog = new AlertDialog.Builder(FoodList.this);
dialog.setTitle("Choose an action");
dialog.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
if (item == 0) {
Intent i = new Intent(getApplicationContext(), ImageDisplay.class);
i.putExtra("id", position);
startActivity(i);
Toast.makeText(getApplicationContext(),"You click on " + position, Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getApplicationContext(),"you download " + position, Toast.LENGTH_SHORT).show();
}
}
});
dialog.show();
//return true;
}
});
gridView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, final int position, long id) {
CharSequence[] items = {"Update", "Delete"};
AlertDialog.Builder dialog = new AlertDialog.Builder(FoodList.this);
dialog.setTitle("Choose an action");
dialog.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
if (item == 0) {
// update
Cursor c = MainActivity.sqLiteHelper.getData("SELECT id FROM FOOD");
ArrayList<Integer> arrID = new ArrayList<Integer>();
while (c.moveToNext()){
arrID.add(c.getInt(0));
}
// show dialog update at here
showDialogUpdate(FoodList.this, arrID.get(position));
} else {
// delete
Cursor c = MainActivity.sqLiteHelper.getData("SELECT id FROM FOOD");
ArrayList<Integer> arrID = new ArrayList<Integer>();
while (c.moveToNext()){
arrID.add(c.getInt(0));
}
showDialogDelete(arrID.get(position));
}
}
});
dialog.show();
return true;
}
});
}
ImageView imageViewFood;
private void showDialogUpdate(Activity activity, final int position){
final Dialog dialog = new Dialog(activity);
dialog.setContentView(R.layout.update_food_activity);
dialog.setTitle("Update");
imageViewFood = (ImageView) dialog.findViewById(R.id.imageViewFood);
final EditText edtName = (EditText) dialog.findViewById(R.id.edtName);
final EditText edtPrice = (EditText) dialog.findViewById(R.id.edtPrice);
Button btnUpdate = (Button) dialog.findViewById(R.id.btnUpdate);
// set width for dialog
int width = (int) (activity.getResources().getDisplayMetrics().widthPixels * 0.95);
// set height for dialog
int height = (int) (activity.getResources().getDisplayMetrics().heightPixels * 0.7);
dialog.getWindow().setLayout(width, height);
dialog.show();
imageViewFood.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// request photo library
ActivityCompat.requestPermissions(
FoodList.this,
new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
888
);
}
});
btnUpdate.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
try {
MainActivity.sqLiteHelper.updateData(
edtName.getText().toString().trim(),
edtPrice.getText().toString().trim(),
MainActivity.imageViewToByte(imageViewFood),
position
);
dialog.dismiss();
Toast.makeText(getApplicationContext(), "Update successfully!!!",Toast.LENGTH_SHORT).show();
}
catch (Exception error) {
Log.e("Update error", error.getMessage());
}
updateFoodList();
}
});
}
private void showDialogDelete(final int idFood){
final AlertDialog.Builder dialogDelete = new AlertDialog.Builder(FoodList.this);
dialogDelete.setTitle("Warning!!");
dialogDelete.setMessage("Are you sure you want to this delete?");
dialogDelete.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
try {
MainActivity.sqLiteHelper.deleteData(idFood);
Toast.makeText(getApplicationContext(), "Delete successfully!!!",Toast.LENGTH_SHORT).show();
} catch (Exception e){
Log.e("error", e.getMessage());
}
updateFoodList();
}
});
dialogDelete.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
dialogDelete.show();
}
private void updateFoodList(){
// get all data from sqlite
Cursor cursor = MainActivity.sqLiteHelper.getData("SELECT * FROM FOOD");
list.clear();
while (cursor.moveToNext()) {
int id = cursor.getInt(0);
String name = cursor.getString(1);
String price = cursor.getString(2);
byte[] image = cursor.getBlob(3);
list.add(new Food(name, price, image, id));
}
adapter.notifyDataSetChanged();
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
if(requestCode == 888){
if(grantResults.length >0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
Intent intent = new Intent(Intent.ACTION_PICK);
intent.setType("image/*");
startActivityForResult(intent, 888);
}
else {
Toast.makeText(getApplicationContext(), "You don't have permission to access file location!", Toast.LENGTH_SHORT).show();
}
return;
}
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode == 888 && resultCode == RESULT_OK && data != null){
Uri uri = data.getData();
try {
InputStream inputStream = getContentResolver().openInputStream(uri);
Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
imageViewFood.setImageBitmap(bitmap);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
super.onActivityResult(requestCode, resultCode, data);
}
}
我想在用户点击时全屏显示图像
这是我的DisplayImage类
public class ImageDisplay extends Activity {
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.imagedisplay);
Intent i = getIntent();
int position = i.getExtras().getInt("id");
ImageView imageViewFood = (ImageView) findViewById(R.id.fullimage);
imageViewFood.setImageResource(position);
}
}
它是正确的代码吗？请帮帮我，谢谢