Android GridView 0 position issue

I know this question is already asked but I didn't get any proper solution to solve 0 position issue. I am working on Gridview and created one adaptor (ButtonAdapter) for this. so I have 4 buttons and If I click any one of them then selected button should change bg color and remaining all three buttons should have reduced opacity let say 0.3 but My problem is that my first button does not change the alpha. So what is the exact issue?

package adaptor;

    import android.content.Context;

    import android.view.LayoutInflater;

    import android.view.View;

    import android.view.ViewGroup;

    import android.widget.BaseAdapter;

    import android.widget.Button;



    import com.appsee.Appsee;

    import com.regiumconsulting.donationssumup.MainActivity;

    import com.regiumconsulting.donationssumup.R;



    import java.math.BigDecimal;

    import java.util.HashMap;

    import java.util.Map;



    public class ButtonAdapter extends BaseAdapter {



        private Context context;

        private final String mobileValues;

        private BigDecimal amnt;

        private Button chosenone = new Button[1];

        private Button tempBtn = null;

        private BigDecimal amount;

        private Map<Button, BigDecimal> buttons = new HashMap<>();



        public ButtonAdapter(Context context, String mobileValues) {

            this.context = context;

            this.mobileValues = mobileValues;

            tempBtn = new Button[mobileValues.length];

        }



        public View getView(final int position, View convertView, ViewGroup parent) {



            View gridView = null;



            if (convertView == null) {



                LayoutInflater inflater = (LayoutInflater) context

                        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);



                gridView = new View(context);

                // get layout from item_adaptor.xmlor.xml

                gridView = inflater.inflate(R.layout.item_adaptor, null);



            } else {

                gridView = convertView;

            }



            // set image based on selected text

            final Button btnView = (Button) gridView

                    .findViewById(R.id.grid_item_image);



            setBtnAmnt(position, btnView);



            btnView.setBackgroundResource(R.drawable.button_bg_dashed_border);

            tempBtn[position] = btnView;



            btnView.setOnClickListener(new View.OnClickListener() {

                @Override

                public void onClick(View v) {



                 for (int i = 0; i < tempBtn.length; i++) {//set alpha to 0.5 for all buttons

                 tempBtn[i].setAlpha(0.3f);//updating only three buttons bg not for 1st one.

                }

                 chosenone[0] = btnView;



                amount = buttons.get(chosenone[0]);



        chosenone[0].setBackgroundResource(R.drawable.button_bg_border);//set alpha 1 to selected one and set selected color

                chosenone[0].setAlpha(1f);



         }     

      }  

    });

     return gridView;

  }



        @Override

        public int getCount() {

            return mobileValues.length;

        }



        @Override

        public Object getItem(int position) {

            return null;

        }



        @Override

        public long getItemId(int position) {

            return 0;

        }



        private void setBtnAmnt(int position, Button imageView) {

            amnt = new BigDecimal(mobileValues[position]);

            imageView.setText(String.format("£ %s", amnt.toString()));

            buttons.put(imageView, amnt);



        }

    }



    Also, I have created on method inside main activity let say screenClick.



    public void screenClick() {

            gridView.setAdapter(adaptor);

            adaptor.notifyDataSetChanged();

        }



So If I call this method and then perform the same operation as mentioned above then only it will work and it will set 0.3 alpha for a 1st button. So what is the issue I don't understand?



I have also attached a screenshot link where a 1st button doesn't have reduced opacity.

https://imgur.com/a/bofGMk4

asked Jan 2 at 7:26

Ashish Jain

114110

You said you have 4 buttons in grid_item_image . But i am seeing only one button here which is R.id.grid_item_image.

– ADM
Jan 2 at 8:00

@ADM Yes in Adaptor I have defined one button and it depends on String mobileValues length, which I am passing through mainactivity class as a constructor.

– Ashish Jain
Jan 2 at 8:23

So where is the 4 buttons ? Your question is quite unclear . Attach an screen shot of your grid view .

– ADM
Jan 2 at 8:28

@ADM please see this imgur.com/a/bofGMk4

– Ashish Jain
Jan 2 at 8:29

this is One button = one grid item . Then why are having this array of Button in your adapter . I can provide you solution but i can not understand why you have used those Button array.

– ADM
Jan 2 at 8:34

|
show 3 more comments

package adaptor;

    import android.content.Context;

    import android.view.LayoutInflater;

    import android.view.View;

    import android.view.ViewGroup;

    import android.widget.BaseAdapter;

    import android.widget.Button;



    import com.appsee.Appsee;

    import com.regiumconsulting.donationssumup.MainActivity;

    import com.regiumconsulting.donationssumup.R;



    import java.math.BigDecimal;

    import java.util.HashMap;

    import java.util.Map;



    public class ButtonAdapter extends BaseAdapter {



        private Context context;

        private final String mobileValues;

        private BigDecimal amnt;

        private Button chosenone = new Button[1];

        private Button tempBtn = null;

        private BigDecimal amount;

        private Map<Button, BigDecimal> buttons = new HashMap<>();



        public ButtonAdapter(Context context, String mobileValues) {

            this.context = context;

            this.mobileValues = mobileValues;

            tempBtn = new Button[mobileValues.length];

        }



        public View getView(final int position, View convertView, ViewGroup parent) {



            View gridView = null;



            if (convertView == null) {



                LayoutInflater inflater = (LayoutInflater) context

                        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);



                gridView = new View(context);

                // get layout from item_adaptor.xmlor.xml

                gridView = inflater.inflate(R.layout.item_adaptor, null);



            } else {

                gridView = convertView;

            }



            // set image based on selected text

            final Button btnView = (Button) gridView

                    .findViewById(R.id.grid_item_image);



            setBtnAmnt(position, btnView);



            btnView.setBackgroundResource(R.drawable.button_bg_dashed_border);

            tempBtn[position] = btnView;



            btnView.setOnClickListener(new View.OnClickListener() {

                @Override

                public void onClick(View v) {



                 for (int i = 0; i < tempBtn.length; i++) {//set alpha to 0.5 for all buttons

                 tempBtn[i].setAlpha(0.3f);//updating only three buttons bg not for 1st one.

                }

                 chosenone[0] = btnView;



                amount = buttons.get(chosenone[0]);



        chosenone[0].setBackgroundResource(R.drawable.button_bg_border);//set alpha 1 to selected one and set selected color

                chosenone[0].setAlpha(1f);



         }     

      }  

    });

     return gridView;

  }



        @Override

        public int getCount() {

            return mobileValues.length;

        }



        @Override

        public Object getItem(int position) {

            return null;

        }



        @Override

        public long getItemId(int position) {

            return 0;

        }



        private void setBtnAmnt(int position, Button imageView) {

            amnt = new BigDecimal(mobileValues[position]);

            imageView.setText(String.format("£ %s", amnt.toString()));

            buttons.put(imageView, amnt);



        }

    }



    Also, I have created on method inside main activity let say screenClick.



    public void screenClick() {

            gridView.setAdapter(adaptor);

            adaptor.notifyDataSetChanged();

        }



So If I call this method and then perform the same operation as mentioned above then only it will work and it will set 0.3 alpha for a 1st button. So what is the issue I don't understand?



I have also attached a screenshot link where a 1st button doesn't have reduced opacity.

https://imgur.com/a/bofGMk4

asked Jan 2 at 7:26

Ashish Jain

114110

You said you have 4 buttons in grid_item_image . But i am seeing only one button here which is R.id.grid_item_image.

– ADM
Jan 2 at 8:00

@ADM Yes in Adaptor I have defined one button and it depends on String mobileValues length, which I am passing through mainactivity class as a constructor.

– Ashish Jain
Jan 2 at 8:23

So where is the 4 buttons ? Your question is quite unclear . Attach an screen shot of your grid view .

– ADM
Jan 2 at 8:28

@ADM please see this imgur.com/a/bofGMk4

– Ashish Jain
Jan 2 at 8:29

this is One button = one grid item . Then why are having this array of Button in your adapter . I can provide you solution but i can not understand why you have used those Button array.

– ADM
Jan 2 at 8:34

|
show 3 more comments

package adaptor;

    import android.content.Context;

    import android.view.LayoutInflater;

    import android.view.View;

    import android.view.ViewGroup;

    import android.widget.BaseAdapter;

    import android.widget.Button;



    import com.appsee.Appsee;

    import com.regiumconsulting.donationssumup.MainActivity;

    import com.regiumconsulting.donationssumup.R;



    import java.math.BigDecimal;

    import java.util.HashMap;

    import java.util.Map;



    public class ButtonAdapter extends BaseAdapter {



        private Context context;

        private final String mobileValues;

        private BigDecimal amnt;

        private Button chosenone = new Button[1];

        private Button tempBtn = null;

        private BigDecimal amount;

        private Map<Button, BigDecimal> buttons = new HashMap<>();



        public ButtonAdapter(Context context, String mobileValues) {

            this.context = context;

            this.mobileValues = mobileValues;

            tempBtn = new Button[mobileValues.length];

        }



        public View getView(final int position, View convertView, ViewGroup parent) {



            View gridView = null;



            if (convertView == null) {



                LayoutInflater inflater = (LayoutInflater) context

                        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);



                gridView = new View(context);

                // get layout from item_adaptor.xmlor.xml

                gridView = inflater.inflate(R.layout.item_adaptor, null);



            } else {

                gridView = convertView;

            }



            // set image based on selected text

            final Button btnView = (Button) gridView

                    .findViewById(R.id.grid_item_image);



            setBtnAmnt(position, btnView);



            btnView.setBackgroundResource(R.drawable.button_bg_dashed_border);

            tempBtn[position] = btnView;



            btnView.setOnClickListener(new View.OnClickListener() {

                @Override

                public void onClick(View v) {



                 for (int i = 0; i < tempBtn.length; i++) {//set alpha to 0.5 for all buttons

                 tempBtn[i].setAlpha(0.3f);//updating only three buttons bg not for 1st one.

                }

                 chosenone[0] = btnView;



                amount = buttons.get(chosenone[0]);



        chosenone[0].setBackgroundResource(R.drawable.button_bg_border);//set alpha 1 to selected one and set selected color

                chosenone[0].setAlpha(1f);



         }     

      }  

    });

     return gridView;

  }



        @Override

        public int getCount() {

            return mobileValues.length;

        }



        @Override

        public Object getItem(int position) {

            return null;

        }



        @Override

        public long getItemId(int position) {

            return 0;

        }



        private void setBtnAmnt(int position, Button imageView) {

            amnt = new BigDecimal(mobileValues[position]);

            imageView.setText(String.format("£ %s", amnt.toString()));

            buttons.put(imageView, amnt);



        }

    }



    Also, I have created on method inside main activity let say screenClick.



    public void screenClick() {

            gridView.setAdapter(adaptor);

            adaptor.notifyDataSetChanged();

        }



So If I call this method and then perform the same operation as mentioned above then only it will work and it will set 0.3 alpha for a 1st button. So what is the issue I don't understand?



I have also attached a screenshot link where a 1st button doesn't have reduced opacity.

https://imgur.com/a/bofGMk4

asked Jan 2 at 7:26

Ashish Jain

114110

package adaptor;

    import android.content.Context;

    import android.view.LayoutInflater;

    import android.view.View;

    import android.view.ViewGroup;

    import android.widget.BaseAdapter;

    import android.widget.Button;



    import com.appsee.Appsee;

    import com.regiumconsulting.donationssumup.MainActivity;

    import com.regiumconsulting.donationssumup.R;



    import java.math.BigDecimal;

    import java.util.HashMap;

    import java.util.Map;



    public class ButtonAdapter extends BaseAdapter {



        private Context context;

        private final String mobileValues;

        private BigDecimal amnt;

        private Button chosenone = new Button[1];

        private Button tempBtn = null;

        private BigDecimal amount;

        private Map<Button, BigDecimal> buttons = new HashMap<>();



        public ButtonAdapter(Context context, String mobileValues) {

            this.context = context;

            this.mobileValues = mobileValues;

            tempBtn = new Button[mobileValues.length];

        }



        public View getView(final int position, View convertView, ViewGroup parent) {



            View gridView = null;



            if (convertView == null) {



                LayoutInflater inflater = (LayoutInflater) context

                        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);



                gridView = new View(context);

                // get layout from item_adaptor.xmlor.xml

                gridView = inflater.inflate(R.layout.item_adaptor, null);



            } else {

                gridView = convertView;

            }



            // set image based on selected text

            final Button btnView = (Button) gridView

                    .findViewById(R.id.grid_item_image);



            setBtnAmnt(position, btnView);



            btnView.setBackgroundResource(R.drawable.button_bg_dashed_border);

            tempBtn[position] = btnView;



            btnView.setOnClickListener(new View.OnClickListener() {

                @Override

                public void onClick(View v) {



                 for (int i = 0; i < tempBtn.length; i++) {//set alpha to 0.5 for all buttons

                 tempBtn[i].setAlpha(0.3f);//updating only three buttons bg not for 1st one.

                }

                 chosenone[0] = btnView;



                amount = buttons.get(chosenone[0]);



        chosenone[0].setBackgroundResource(R.drawable.button_bg_border);//set alpha 1 to selected one and set selected color

                chosenone[0].setAlpha(1f);



         }     

      }  

    });

     return gridView;

  }



        @Override

        public int getCount() {

            return mobileValues.length;

        }



        @Override

        public Object getItem(int position) {

            return null;

        }



        @Override

        public long getItemId(int position) {

            return 0;

        }



        private void setBtnAmnt(int position, Button imageView) {

            amnt = new BigDecimal(mobileValues[position]);

            imageView.setText(String.format("£ %s", amnt.toString()));

            buttons.put(imageView, amnt);



        }

    }



    Also, I have created on method inside main activity let say screenClick.



    public void screenClick() {

            gridView.setAdapter(adaptor);

            adaptor.notifyDataSetChanged();

        }



So If I call this method and then perform the same operation as mentioned above then only it will work and it will set 0.3 alpha for a 1st button. So what is the issue I don't understand?



I have also attached a screenshot link where a 1st button doesn't have reduced opacity.

https://imgur.com/a/bofGMk4

android gridview

asked Jan 2 at 7:26

Ashish Jain

114110

asked Jan 2 at 7:26

Ashish Jain

114110

asked Jan 2 at 7:26

Ashish Jain

114110

asked Jan 2 at 7:26

Ashish Jain

114110

asked Jan 2 at 7:26

Ashish Jain

114110

You said you have 4 buttons in grid_item_image . But i am seeing only one button here which is R.id.grid_item_image.

– ADM
Jan 2 at 8:00

@ADM Yes in Adaptor I have defined one button and it depends on String mobileValues length, which I am passing through mainactivity class as a constructor.

– Ashish Jain
Jan 2 at 8:23

So where is the 4 buttons ? Your question is quite unclear . Attach an screen shot of your grid view .

– ADM
Jan 2 at 8:28

@ADM please see this imgur.com/a/bofGMk4

– Ashish Jain
Jan 2 at 8:29

this is One button = one grid item . Then why are having this array of Button in your adapter . I can provide you solution but i can not understand why you have used those Button array.

– ADM
Jan 2 at 8:34

|
show 3 more comments

You said you have 4 buttons in grid_item_image . But i am seeing only one button here which is R.id.grid_item_image.

– ADM
Jan 2 at 8:00

@ADM Yes in Adaptor I have defined one button and it depends on String mobileValues length, which I am passing through mainactivity class as a constructor.

– Ashish Jain
Jan 2 at 8:23

So where is the 4 buttons ? Your question is quite unclear . Attach an screen shot of your grid view .

– ADM
Jan 2 at 8:28

@ADM please see this imgur.com/a/bofGMk4

– Ashish Jain
Jan 2 at 8:29

this is One button = one grid item . Then why are having this array of Button in your adapter . I can provide you solution but i can not understand why you have used those Button array.

– ADM
Jan 2 at 8:34

You said you have 4 buttons in grid_item_image . But i am seeing only one button here which is R.id.grid_item_image.

– ADM
Jan 2 at 8:00

@ADM Yes in Adaptor I have defined one button and it depends on String mobileValues length, which I am passing through mainactivity class as a constructor.

– Ashish Jain
Jan 2 at 8:23

So where is the 4 buttons ? Your question is quite unclear . Attach an screen shot of your grid view .

– ADM
Jan 2 at 8:28

@ADM please see this imgur.com/a/bofGMk4

– Ashish Jain
Jan 2 at 8:29

this is One button = one grid item . Then why are having this array of Button in your adapter . I can provide you solution but i can not understand why you have used those Button array.

– ADM
Jan 2 at 8:34

|
show 3 more comments

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