我使用GridView来显示电池类型的图像。当用户单击任何图像时，该特定电池的功能将在下一页打印。图像和功能从服务器获取。问题是我打开GridView时显示的第一个电池图像，但只有在我滚动屏幕两到三次后，其他电池图像才显示在GridView中。但是我想在打开GridView后显示所有图像。
private void getDatasFromIntent() {
alHM = new ArrayList<>();
Intent intent = getIntent();
String typeResp = intent.getStringExtra("IMG_S");
try {
JSONObject jsonObject = new JSONObject(typeResp);
JSONArray jsonArray = jsonObject.getJSONArray("process");
for (int i = 0; i < jsonArray.length(); i++) {
HashMap<String, String> hm = new HashMap<>();
JSONObject bat_json = jsonArray.getJSONObject(i);
String battery_featues_id = bat_json.getString("battery_featues_id");
String battery = bat_json.getString("battery_type");
String battery_image = bat_json.getString("battery_image");
battery_image = battery_image.replace("\\", "");
hm.put("battery_featues_id", battery_featues_id);
hm.put("battery_type", battery);
hm.put("battery_image", battery_image);
alHM.add(hm);
}
// prepared arraylist and passed it to the Adapter class
mAdapter = new GridviewAdapter(this, alHM);
// Set custom adapter to gridview
GridView gridView = (GridView) findViewById(R.id.gridView1);
gridView.setAdapter(mAdapter);
// Implement On Item click listener
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position,
long arg3) {
Toast.makeText(SampleBatteryList.this, "a: " + mAdapter.getItem(position), Toast.LENGTH_SHORT).show();
}
});
} catch (JSONException e) {
e.printStackTrace();
}
}
public class GridviewAdapter extends BaseAdapter {
private ArrayList<HashMap<String, String>> list;
private final SampleBatteryList activity;
public GridviewAdapter(SampleBatteryList sampleBatteryList,
ArrayList<HashMap<String, String>> alHM) {
this.activity = sampleBatteryList;
this.list = alHM;
Log.d("VOLLY", "ADP :" + alHM);
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int i) {
return list.get(i);
}
@Override
public long getItemId(int i) {
return i;
}
public class ViewHolder {
public ImageView imgViewFlag;
public TextView txtViewTitle;
public Button button;
ViewHolder view;
}
@Override
public View getView(int i, View contentView, ViewGroup viewGroup) {
Log.d("VOLLY", "INT : " + i);
ViewHolder view;
LayoutInflater inflator = activity.getLayoutInflater();
if (contentView == null) {
view = new ViewHolder();
contentView = inflator.inflate(R.layout.grid_content_sub, null);
view.txtViewTitle = (TextView)
contentView.findViewById(R.id.tv_battery_type);
view.imgViewFlag = (ImageView)
contentView.findViewById(R.id.img_battery);
view.button = (Button)
contentView.findViewById(R.id.btn_card_type);
contentView.setTag(view);
} else {
view = (ViewHolder) contentView.getTag();
view.txtViewTitle.setText(list.get(i).get("battery_type"));
view.imgViewFlag.setImageResource(R.drawable.branded_logo);
view.imgViewFlag.setImageDrawable(null);
Picasso.with(SampleBatteryList.this)
.load(Links._img + list.get(i).get("battery_image"))
.fit().centerCrop()
.into(view.imgViewFlag);
final int ii = i;
final Button btn = view.button;
view.button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
btn.setText(list.get(ii).get("battery_type"));
btn.setSingleLine(true);
YoYo.with(Techniques.TakingOff).duration(2000).playOn(btn);
showDialog();
Log.d("VOLLY", "id :" +list.get(ii).get("battery_featues_id"));
callVollyForFeature(list.get(ii).get("battery_featues_id"));
}
});
}
return contentView;
}
}
答案 0 :(得分：0)
这里你使用的是视图持有者类，但在初始化之后，部分和赋值部分都在if和else中，因此没有显示。
@Override
public View getView(int i, View contentView, ViewGroup viewGroup) {
Log.d("VOLLY", "INT : " + i);
ViewHolder view;
LayoutInflater inflator = activity.getLayoutInflater();
if (contentView == null) {
view = new ViewHolder();
contentView = inflator.inflate(R.layout.grid_content_sub, null);
view.txtViewTitle = (TextView)
contentView.findViewById(R.id.tv_battery_type);
view.imgViewFlag = (ImageView)
contentView.findViewById(R.id.img_battery);
view.button = (Button)
contentView.findViewById(R.id.btn_card_type);
contentView.setTag(view);
} else {
view = (ViewHolder) contentView.getTag();
view.txtViewTitle.setText(list.get(i).get("battery_type"));
view.imgViewFlag.setImageResource(R.drawable.branded_logo);
view.imgViewFlag.setImageDrawable(null);
Picasso.with(SampleBatteryList.this)
.load(Links._img + list.get(i).get("battery_image"))
.fit().centerCrop()
.into(view.imgViewFlag);
final int ii = i;
final Button btn = view.button;
view.button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
btn.setText(list.get(ii).get("battery_type"));
btn.setSingleLine(true);
YoYo.with(Techniques.TakingOff).duration(2000).playOn(btn);
showDialog();
Log.d("VOLLY", "id :" +list.get(ii).get("battery_featues_id"));
callVollyForFeature(list.get(ii).get("battery_featues_id"));
}
});
}
return contentView;
}
更改为
@Override
public View getView(int i, View contentView, ViewGroup viewGroup) {
Log.d("VOLLY", "INT : " + i);
ViewHolder view;
LayoutInflater inflator = activity.getLayoutInflater();
if (contentView == null) {
view = new ViewHolder();
contentView = inflator.inflate(R.layout.grid_content_sub, null);
view.txtViewTitle = (TextView)
contentView.findViewById(R.id.tv_battery_type);
view.imgViewFlag = (ImageView)
contentView.findViewById(R.id.img_battery);
view.button = (Button)
contentView.findViewById(R.id.btn_card_type);
contentView.setTag(view);
}else{
view = (ViewHolder) contentView.getTag();
}
view.txtViewTitle.setText(list.get(i).get("battery_type"));
view.imgViewFlag.setImageResource(R.drawable.branded_logo);
view.imgViewFlag.setImageDrawable(null);
Picasso.with(SampleBatteryList.this)
.load(Links._img + list.get(i).get("battery_image"))
.fit().centerCrop()
.into(view.imgViewFlag);
final int ii = i;
final Button btn = view.button;
view.button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
btn.setText(list.get(ii).get("battery_type"));
btn.setSingleLine(true);
YoYo.with(Techniques.TakingOff).duration(2000).playOn(btn);
showDialog();
Log.d("VOLLY", "id :" +list.get(ii).get("battery_featues_id"));
callVollyForFeature(list.get(ii).get("battery_featues_id"));
}
});
return contentView;
}