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我在每行都有一個textview和imageview的列表視圖，並試圖找出如何在點擊它們時放大圖像。用戶從他們的圖庫中獲取圖像並將其存儲在名稱數據庫中。它們是用於交付目的地的度假村/酒店的地圖。 這一切是如何佈局：Android單擊列表查看展開ImageView
我試圖讓我的應用程序，我可以點擊一個ImageView的，或只是簡單的列表視圖本身，並在中央放大的圖像的屏幕。如果不在屏幕中心放大，我甚至不介意在新的活動中打開放大的圖像。無論哪種方式都很好，我只希望能夠閱讀地圖，所以通過捏縮放來做一些事情會很棒！我從用戶的畫廊獲取圖像並將其存儲在一個列表中，並要求他們輸入酒店/度假村的名稱。然後我將這些信息保存到一個數據庫並在列表視圖中顯示。我將這些圖像剪下來，以縮略圖的形式將它們放入列表視圖中，但我想在點擊時將它們展開以方便閱讀。任何幫助將不勝感激！我的目標是讓它看起來像this問題的答案，但無法弄清楚如何將其優化到我的代碼中。
我的適配器類如下：
public class dataAdapter extends ArrayAdapter<Hotel> {
Context context;
ArrayList<Hotel> mHotel;
public dataAdapter(Context context, ArrayList<Hotel> hotel)
{
super(context, R.layout.listhotels, hotel);
this.context = context;
this.mHotel = hotel;
}
public class Holder
{
TextView nameFV;
ImageView pic;
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
Hotel data = getItem(position);
Holder viewHolder;
if (convertView == null)
{
viewHolder = new Holder();
LayoutInflater inflater = LayoutInflater.from(getContext());
convertView = inflater.inflate(R.layout.listhotels, parent, false);
viewHolder.nameFV = (TextView) convertView.findViewById(R.id.txtViewer);
viewHolder.pic = (ImageView) convertView.findViewById(R.id.imgView);
convertView.setTag(viewHolder);
}
else
{
viewHolder = (Holder) convertView.getTag();
}
viewHolder.nameFV.setText(data.getFName());
viewHolder.pic.setImageBitmap(convertToBitmap(data.getImage()));
return convertView;
}
private Bitmap convertToBitmap(byte[] b)
{
return BitmapFactory.decodeByteArray(b, 0, b.length);
}
}
我的代碼，以顯示酒店列表：
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.display_hotels);
lv = (ListView) findViewById(R.id.list1);
db = new DatabaseHandler(this);
pic = (ImageView) findViewById(R.id.pic);
fname = (EditText) findViewById(R.id.txt1);
final ArrayList<Hotel> hotels = new ArrayList<>(db.getAllHotels());
data = new dataAdapter(this, hotels);
data.sort(new Comparator<Hotel>()
{
@Override
public int compare(Hotel arg0, Hotel arg1)
{
return arg0.getFName().compareTo(arg1.getFName());
}
});
data.notifyDataSetChanged();
lv.setAdapter(data);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> parent, View v, int position, long id)
{
Intent i = new Intent(getApplicationContext(), display_full_image.class);
startActivity(i);
}
});
}
而我的主要活動：
public class MapsMainActivity extends AppCompatActivity {
private EditText fname;
private ImageView pic;
private DatabaseHandler db;
private String f_name;
private ListView lv;
private dataAdapter data;
private Hotel dataModel;
private Bitmap bp;
private byte[] photo;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps_main);
db = new DatabaseHandler(this);
lv = (ListView) findViewById(R.id.list1);
pic = (ImageView) findViewById(R.id.pic);
fname = (EditText) findViewById(R.id.txt1);
}
public void buttonClicked(View v)
{
int id = v.getId();
switch(id)
{
case R.id.save:
if (fname.getText().toString().trim().equals(""))
{
Toast.makeText(getApplicationContext(), "Name edit text is empty, Enter name", Toast.LENGTH_LONG).show();
}
else
{
addHotel();
}
break;
case R.id.display:
showRecords();
Intent intent = new Intent(getApplicationContext(), display_hotels.class);
startActivity(intent);
break;
case R.id.pic:
selectImage();
break;
}
}
public void selectImage()
{
Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
photoPickerIntent.setType("image/*");
startActivityForResult(photoPickerIntent, 2);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
switch(requestCode)
{
case 2:
if(resultCode == RESULT_OK)
{
Uri chosenImage = data.getData();
if(chosenImage != null)
{
bp = decodeUri(chosenImage, 400);
pic.setImageBitmap(bp);
}
}
}
}
protected Bitmap decodeUri(Uri selectedImage, int REQUIRED_SIZE)
{
try
{
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(getContentResolver().openInputStream(selectedImage), null, o);
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true)
{
if (width_tmp/2 < REQUIRED_SIZE || height_tmp/2 < REQUIRED_SIZE)
{
break;
}
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
return BitmapFactory.decodeStream(getContentResolver().openInputStream(selectedImage), null, o2);
}
catch (Exception e)
{
e.printStackTrace();
}
return null;
}
private byte[] profileImage(Bitmap b)
{
ByteArrayOutputStream bos = new ByteArrayOutputStream();
b.compress(Bitmap.CompressFormat.PNG, 0, bos);
return bos.toByteArray();
}
private void getValues()
{
f_name = fname.getText().toString();
photo = profileImage(bp);
}
private void addHotel()
{
getValues();
db.addHotels(new Hotel(f_name, photo));
Toast.makeText(getApplicationContext(), "Saved successfully", Toast.LENGTH_SHORT).show();
}
private void showRecords()
{
final ArrayList<Hotel> hotels = new ArrayList<>(db.getAllHotels());
data = new dataAdapter(this, hotels);
data.notifyDataSetChanged();
lv.setOnItemClickListener(new AdapterView.OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id)
{
dataModel = hotels.get(position);
Toast.makeText(getApplicationContext(), String.valueOf(dataModel.getID()), Toast.LENGTH_SHORT).show();
}
});
}
}
預先感謝您任何人都可以幫助我。我將不勝感激。這是我的移動應用程序開發課程的最後一個項目，這個課程將在2天內到期，我真的很接近完成它。感謝您的時間。
我不明白，你有，這是非常常見的任務問題，併爲您可以在互聯網上找到很多例子。簡而言之，您可以在列表視圖的項目中顯示圖像的縮略圖。對於整頁你使用完整的圖像。你發佈的代碼太多了。我甚至沒有看它。 – greenapps
你只是想用選定的圖像顯示放大的圖像，當你點擊listItem的圖像時，是嗎？ –
@ankit purwar是的，這正是我想要做的。 –