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POChanging TextView Text Size in Custom List View in run time
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  1. POChanging TextView Text Size in Custom List View in run time
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    copied!<p>I'm now implementing a custom <code>ListView</code>. When I tried to change the <code>TextView</code> that is located in <code>CustomAdaper.xml</code> from <code>MainActivity</code>. It show NullPointerException. Isn't it possible to do like this . Help me finding it Please . I get so confused . </p> <p>Below is my <strong>MainActivity.java</strong> Code : </p> <pre><code>setContentView(R.layout.activity_main); txt_Position = (TextView)findViewById(R.id.txtposition);//still ok txt_memberName = (TextView)findViewById(R.id.txtmemberName);// still ok LayoutParams params = (LayoutParams) layout_Date.getLayoutParams(); LayoutParams params1 = (LayoutParams) layout_List.getLayoutParams(); LayoutParams params2 = (LayoutParams) layout_Rotation.getLayoutParams(); int screenSize = getResources().getConfiguration().screenLayout &amp; Configuration.SCREENLAYOUT_SIZE_MASK; switch(screenSize) { case Configuration.SCREENLAYOUT_SIZE_LARGE: Toast.makeText(this, "Large", Toast.LENGTH_LONG).show(); params.height = 100; params1.height = 330 ; params2.height = 200; txt_Position.setTextSize((float)18.0); //locate in CustomAdapter.xml and this is the line logCat Error Pointed . break; </code></pre> <p>CustomAdapter.Java</p> <pre><code>public class CustomAdapter extends BaseAdapter { private Activity activity; private ArrayList data; private static LayoutInflater inflater=null; public Resources res; ListModel getList; int size ; int i=0; public CustomAdapter(Activity a, ArrayList d,Resources resLocal, int size) { activity = a; data=d; res = resLocal; this.size = size; inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE); } public int getCount() { if(data.size()&lt;=0) return 1; return data.size(); } public Object getItem(int position) { return position; } public long getItemId(int position) { return position; } public static class ViewHolder{ public TextView txt_Name; public TextView txt_Status; public TextView txt_Position; public ImageButton imgbtn_senka; public ImageButton imgbtn_fuenka; //public TableRow tblrow_btn; public RelativeLayout layoutbtn; public ImageView image; } public View getView(final int position, View convertView, ViewGroup parent) { View vi=convertView; final ViewHolder holder; if(convertView==null){ /********** Inflate tabitem.xml file for each row ( Defined below ) ************/ vi = inflater.inflate(R.layout.customadapter, null); holder=new ViewHolder(); holder.txt_Name = (TextView)vi.findViewById(R.id.txtmemberName); holder.txt_Status = (TextView)vi.findViewById(R.id.txtmemberStatus); holder.image = (ImageView)vi.findViewById(R.id.imgPlayer); holder.imgbtn_fuenka = (ImageButton) vi.findViewById(R.id.btnfusenka); holder.imgbtn_senka = (ImageButton) vi.findViewById(R.id.btnsenka); holder.txt_Position = (TextView)vi.findViewById(R.id.txtposition); holder.layoutbtn = (RelativeLayout)vi.findViewById(R.id.layoutbutton); vi.setTag(holder); } else holder=(ViewHolder)vi.getTag(); if(data.size()&lt;=0) { holder.txt_Name.setText("No Data"); } else { getList=null; getList = (ListModel) data.get(position); if(getList.getMemberStatus() == 3){ holder.txt_Status.setVisibility(View.INVISIBLE); holder.imgbtn_fuenka.setVisibility(View.VISIBLE); holder.imgbtn_senka.setVisibility(View.VISIBLE); if(getList.getEntry() == 1){ holder.imgbtn_senka.setImageResource(R.drawable.sankagray); holder.imgbtn_senka.setEnabled(false); } else if(getList.getEntry() == 0){ holder.imgbtn_fuenka.setImageResource(R.drawable.fusankagray); holder.imgbtn_fuenka.setEnabled(false); } holder.imgbtn_senka.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { String entry = "1"; CustomListViewAndroidExample sct = (CustomListViewAndroidExample)activity; sct.updateData(position , entry); holder.imgbtn_senka.setImageResource(R.drawable.sankagray); holder.imgbtn_senka.setEnabled(false); holder.imgbtn_fuenka.setEnabled(true); holder.imgbtn_fuenka.setImageResource(R.drawable.fusanka); } }); holder.imgbtn_fuenka.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { String entry = "0"; CustomListViewAndroidExample sct = (CustomListViewAndroidExample)activity; sct.updateData(position , entry); holder.imgbtn_fuenka.setImageResource(R.drawable.fusankagray); holder.imgbtn_fuenka.setEnabled(false); holder.imgbtn_senka.setEnabled(true); holder.imgbtn_senka.setImageResource(R.drawable.sanka); } }); } else{ holder.txt_Status.setVisibility(View.VISIBLE); holder.imgbtn_fuenka.setVisibility(View.INVISIBLE); holder.imgbtn_senka.setVisibility(View.INVISIBLE); if(getList.getEntry() == 0){ holder.txt_Status.setText("未確認"); } else if(getList.getEntry() == 1){ holder.txt_Status.setText("参加"); } else if(getList.getEntry() == 2){ holder.txt_Status.setText("不参加"); } else if(getList.getEntry() == 3){ holder.txt_Status.setText("取消"); } } holder.txt_Name.setText(getList.getMemberName()); holder.txt_Position.setText(getList.getPosition()); String url="http://10.0.2.2/football365/Photo/"+getList.getImage(); try { Bitmap bitmap= BitmapFactory.decodeStream((InputStream) new URL(url).getContent()); Bitmap resized = Bitmap.createScaledBitmap(bitmap, 76, 76, false); holder.image.setImageBitmap(resized); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } // holder.image.setImageResource(res.getIdentifier("http://10.0.2.2/football365/Photo/"+getList.getImage(),null,null)); } if(size == 1){ holder.txt_Name.setTextSize((float)20.0); } return vi; } public void changeSize(){ ViewHolder holder = new ViewHolder(); holder.txt_Position.setTextSize((float)18.0); holder.txt_Name.setTextSize((float)20.0); } </code></pre> <p>}</p> <p>This is CustomAdapter.xml</p> <pre><code>&lt;TableRow xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:id="@+id/tblrowtotal" android:layout_marginTop="3dp" android:layout_marginBottom="3dp" android:layout_marginLeft="3dp" android:layout_marginRight="3dp" android:background="@drawable/blackrow2" android:layout_height="wrap_content"&gt; &lt;ImageView android:id="@+id/imglin1" android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_marginLeft="2dp" android:src="@drawable/liney" /&gt; &lt;LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" &gt; &lt;ImageView android:layout_marginLeft="3dp" android:id="@+id/imgPlayer" android:layout_width="60dp" android:layout_height="70dp" android:layout_gravity="left|top" android:layout_marginTop="2dp" android:scaleType="center" style="@style/AppBaseTheme" android:background="@null" /&gt; &lt;/LinearLayout&gt; &lt;TableLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="top" android:paddingTop="0dip" &gt; &lt;TableRow&gt; &lt;TextView android:id="@+id/txtmemberName" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="3dp" android:layout_marginTop="15dp" android:textColor="#FFFFFF" android:textSize="13sp" /&gt; &lt;/TableRow&gt; &lt;ImageView android:id="@+id/imgview1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/linex" /&gt; &lt;TableRow android:layout_width="wrap_content" &gt; &lt;ImageView android:id="@+id/position" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="3dp" android:layout_marginTop="10dp" android:src="@drawable/c_position" /&gt; &lt;TextView android:id="@+id/txtposition" android:layout_width="45dp" android:layout_height="30dp" android:layout_marginLeft="3dp" android:layout_marginTop="7dp" android:textColor="#FFFFFF" android:textSize="15sp" /&gt; &lt;ImageView android:id="@+id/img2" android:layout_width="wrap_content" android:layout_height="match_parent" android:scaleType="center" android:layout_marginLeft="0dp" android:src="@drawable/liney" /&gt; &lt;RelativeLayout android:id="@+id/layoutbutton" android:layout_width="wrap_content" android:gravity="right" android:layout_height="wrap_content" &gt; &lt;TextView android:id="@+id/txtmemberStatus" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:layout_marginTop="2dp" android:gravity="center_horizontal" android:textColor="#FFFFFF" android:textSize="16sp" /&gt; &lt;ImageButton android:id="@+id/btnfusenka" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="70dp" android:layout_marginRight="3dp" android:background="@null" android:focusable="false" android:src="@drawable/fusanka"/&gt; &lt;ImageButton android:id="@+id/btnsenka" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:background="@null" android:focusable="false" android:src="@drawable/sanka" /&gt; &lt;/RelativeLayout&gt; &lt;/TableRow&gt; &lt;ImageView android:id="@+id/img3" android:layout_width="fill_parent" android:layout_marginLeft="0dp" android:layout_height="wrap_content" android:src="@drawable/linex" /&gt; &lt;/TableLayout&gt; &lt;/TableRow&gt; </code></pre>
 

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