我正在使用警告对话框显示文件中的图像。但当我按下按钮显示警告对话框时，应用程序冻结了6秒钟，然后警报对话框将会出现...... 我的代码......
listView_prev.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, final View arg1, int arg2, long arg3) {
//listview click event handling
TextView id = (TextView) arg1.findViewById(R.id.textView17);
final int id_To_Search = Integer.valueOf(id.getText().toString());
Cursor item=mydb.singlecons(id_To_Search);
Cursor att=mydb.attrs(id_To_Search);
Cursor picloc=mydb.singleconspic(id_To_Search);
att.moveToFirst();
List<String> list = new ArrayList<>();
// Log.d("temp",att.getColumnName(1));
while (!att.isAfterLast())
{
int l=att.getColumnCount();
Log.d("length", String.valueOf(l));
for(int i=2;i<l;i++){
Log.d("for","for");
if(att.getString(i)!=null){
String b= att.getColumnName(i)+" "+att.getString(i);
list.add(b);
Log.d("att",b);
}
}
Log.d("while","while");
att.moveToNext();
}
att.close();
Log.d("list", String.valueOf(list));
picloc.moveToFirst();
FilePathStrings = new String[picloc.getCount()];
int i=0;
while (!picloc.isAfterLast()){
Log.d("picloc",picloc.getString(2));
FilePathStrings[i]=picloc.getString(2);
i++;
picloc.moveToNext();
}
item.moveToFirst();
AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(Consultation.this);
LayoutInflater inflater = getLayoutInflater();
View dialogView = inflater.inflate(R.layout.alert_label_editor, null);
dialogBuilder.setView(dialogView);
TextView con=(TextView)dialogView.findViewById(R.id.textView29);
con.setText("Consultation on "+item.getString(4));
TextView des=(TextView)dialogView.findViewById(R.id.textView28);
des.setText(item.getString(2));
TextView pre=(TextView)dialogView.findViewById(R.id.textView31);
pre.setText(item.getString(3));
TextView fee=(TextView)dialogView.findViewById(R.id.textView32);
fee.setText(item.getString(5));
adapter1 = new GridViewAdapter(FilePathStrings,getApplicationContext());
grid = (GridView) dialogView.findViewById(R.id.gridview);
grid.setAdapter(adapter1);
grid.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.parse("file://" + FilePathStrings[position]), "image/*");
startActivity(intent);
}
});
AlertDialog alertDialog = dialogBuilder.create();
alertDialog.show();
Gridviewadapter.java
class GridViewAdapter extends BaseAdapter {
private String[] filepath;
private static LayoutInflater inflater = null;
GridViewAdapter(String[] fpath,Context context) {
filepath = fpath;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public int getCount() {
return filepath.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView, ViewGroup parent) {
View vi = convertView;
if (convertView == null)
vi = inflater.inflate(R.layout.gridview_item, null);
ImageView image = (ImageView) vi.findViewById(R.id.image);
Bitmap bmp = BitmapFactory.decodeFile(filepath[position]);
Bitmap thumbBitmap = ThumbnailUtils.extractThumbnail(BitmapFactory.decodeFile(filepath[position]),320,240);
image.setImageBitmap(thumbBitmap);
return vi;
}
}
我该如何解决这个问题。我知道asyctask会有所帮助......我该如何解决这个问题
答案 0 :(得分：0)
使用处理程序，
default答案 1 :(得分：-1)
我认为，为了获得最佳效果，请在另一项活动中执行此操作
无论如何，如果没有，请使用AsyncTask类，例如：
listView_prev.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, final View arg1, int arg2, long arg3) {
//listview click event handling
TextView id = (TextView) arg1.findViewById(R.id.textView17);
final int id_To_Search = Integer.valueOf(id.getText().toString());
new displaysImages().execute(id_To_Search);
}});
....
class displaysImages extends AsyncTask<Integer, Void, Void> {
ProgressDialog dialog;
Cursor item=null;
String FilePathStrings[];
@Override
protected void onPreExecute() {
super.onPreExecute();
/* show ProgressDialog before doing anything*/
dialog = ProgressDialog.show(getApplicationContext(), "Veuillez patienter", "Chargement des données....", true);
}
@Override
protected Void doInBackground(Integer... param) {
try {
item=mydb.singlecons(param[0]);
Cursor att=mydb.attrs(param[0]);
Cursor picloc=mydb.singleconspic(param[0]);
att.moveToFirst();
List<String> list = new ArrayList<>();
// Log.d("temp",att.getColumnName(1));
while (!att.isAfterLast())
{
int l=att.getColumnCount();
Log.d("length", String.valueOf(l));
for(int i=2;i<l;i++){
Log.d("for","for");
if(att.getString(i)!=null){
String b= att.getColumnName(i)+" "+att.getString(i);
list.add(b);
Log.d("att",b);
}
}
Log.d("while","while");
att.moveToNext();
}
att.close();
Log.d("list", String.valueOf(list));
picloc.moveToFirst();
FilePathStrings = new String[picloc.getCount()];
int i=0;
while (!picloc.isAfterLast()){
Log.d("picloc",picloc.getString(2));
FilePathStrings[i]=picloc.getString(2);
i++;
picloc.moveToNext();
}
item.moveToFirst();
} catch (Exception e) {
e.printStackTrace();
dialog.dismiss();
}
return null;
}
@Override
protected void onPostExecute(Void res) {
AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(Consultation.this);
LayoutInflater inflater = getLayoutInflater();
View dialogView = inflater.inflate(R.layout.alert_label_editor, null);
dialogBuilder.setView(dialogView);
TextView con=(TextView)dialogView.findViewById(R.id.textView29);
con.setText("Consultation on "+item.getString(4));
TextView des=(TextView)dialogView.findViewById(R.id.textView28);
des.setText(item.getString(2));
TextView pre=(TextView)dialogView.findViewById(R.id.textView31);
pre.setText(item.getString(3));
TextView fee=(TextView)dialogView.findViewById(R.id.textView32);
fee.setText(item.getString(5));
adapter1 = new GridViewAdapter(FilePathStrings,getApplicationContext());
grid = (GridView) dialogView.findViewById(R.id.gridview);
grid.setAdapter(adapter1);
grid.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.parse("file://" + FilePathStrings[position]), "image/*");
startActivity(intent);
}
});
AlertDialog alertDialog = dialogBuilder.create();
dialog.dismiss();
alertDialog.show();
}}
我没有测试代码，但我认为它的工作原理