Delete row Listview (2)

We want to delete a row of ListView and when user reopen activity the row deleted not appear again.

In folder layout, create a file name li3.xml, put a checked textView in it.

<?xml version="1.0" encoding="utf-8"?>

<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"

    android:id="@+id/text"

    android:layout_width="fill_parent"

    android:layout_height="46dp"

    android:checkMark="@android:drawable/btn_radio"

    android:gravity="center_vertical"

    android:paddingLeft="2dip"

    android:paddingRight="2dip"

    android:textAppearance="?android:attr/textAppearanceLarge"

    android:textColor="#000080"

    android:textSize="17sp" />

Declare an arraylist string.

ArrayList<String> fru = new ArrayList<String>();

fru.add("Pear");

          fru.add("Banana");

          fru.add("Cashew");

          fru.add("Orange");

          fru.add("Water melon");

          fru.add("Peach");

          fru.add("Grape");

          fru.add("Mango");

          fru.add("Plum");

First we read file list.txt to an array.

Declare an ArrayList name check.

ArrayList<String> check = new ArrayList<String>();

Read file list.txt.

String line = "";

          try {

FileInputStream In = openFileInput("list.txt");

InputStreamReader inputReader = new InputStreamReader(In);

BufferedReader BR = new BufferedReader(inputReader);

          while ((line = BR.readLine()) != null) {

          check.add(line);

          }

          BR.close();

          } catch (IOException e) {

               e.printStackTrace();

          }

Check size of array, if size =0 mean there 's no file list.txt, we write data from array fru to file txt.

if(check.size()==0){

         try {

FileOutputStream fos = openFileOutput(

                          "list.txt", Context.MODE_APPEND);

OutputStreamWriter osw = new OutputStreamWriter(

                          fos);

          for (int i = 0; i < fru.length; i++) {

          osw.append(fru[i] + "\n");

               }

               osw.flush();

               osw.close();

          } catch (FileNotFoundException e) {

               // TODO Auto-generated catch block

               e.printStackTrace();

          } catch (IOException e) {

               // TODO Auto-generated catch block

               e.printStackTrace();

          }

          }

Import libraries.

Now declare data array fru2 use for ListView.

Command to read file list.txt:

String line = "";

try {

FileInputStream In = openFileInput("list.txt");

InputStreamReader inputReader = new InputStreamReader(In);

BufferedReader BR = new BufferedReader(inputReader);

          while ((line = BR.readLine()) != null) {

          fru2.add(line);

          }

          BR.close();

          } catch (IOException e) {

          e.printStackTrace();

          }   

Create file li3.xml in folder layout, trong đó có một checked textView.

<?xml version="1.0" encoding="utf-8"?>

<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"

    android:id="@+id/text"

    android:layout_width="fill_parent"

    android:layout_height="46dp"

    android:checkMark="@android:drawable/btn_radio"

    android:gravity="center_vertical"

    android:paddingLeft="2dip"

    android:paddingRight="2dip"

    android:textAppearance="?android:attr/textAppearanceLarge"

    android:textColor="#000080"

    android:textSize="17sp" />

Set adapter for ListView .

adapter=new ArrayAdapter<String>(this,R.layout.li3,R.id.text, fru2);

In delete button, we delete and rewrite file list.txt.

b1.setOnClickListener(new View.OnClickListener() {

     @Override

     public void onClick(View v) {

     if (count == 0) {

Toast.makeText(forth.this, "Please choose a row!",

                                    Toast.LENGTH_SHORT).show();

} else {

SparseBooleanArray checked = lv.getCheckedItemPositions();

          for (int i = 0; i < lv.getCount(); i++) {

               if (checked.get(i) == true) {

                    fu2.remove(i);

                     }

               adapter.notifyDataSetChanged();

          }

          lv.clearChoices();

          deleteFile("list.txt");

     try {

FileOutputStream fos = openFileOutput("list.txt",

                                         Context.MODE_APPEND);

OutputStreamWriter osw = new OutputStreamWriter(fos);

     for (int i = 0; i < fru2.size(); i++) {

          osw.append(fru2.get(i) + "\n");

          }

          osw.flush();

          osw.close();

          } catch (FileNotFoundException e) {

               // TODO Auto-generated catch block

          e.printStackTrace();

     } catch (IOException e) {

     // TODO Auto-generated catch block

     e.printStackTrace();

     }

     count = 0;

Toast.makeText(forth.this, "Data deleted!",

                                    Toast.LENGTH_SHORT).show();

     }

}

});

Run to see result.