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POHow can I build up a display using an EditText with different colors for command and response strings?
 

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  1. POHow can I build up a display using an EditText with different colors for command and response strings?
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    <p>I am trying to implement a hypertext-like application so I can use a tablet via USB to talk to a PIC system. My concept is to have a fragment showing two EditText views, one to allow a command to be composed and edited on the tablet, the other to hold all the traffic in both directions.</p> <p>I have got as far as getting the composed string sorted and added to the traffic view. However, I would like to be able to show the tablet-generated strings in a different color to that used for the PIC-generated replies. I have tried numerous combinations and permutations of setSpan but with no luck - any ideas? I am also open to other ways of achieving the same end.</p> <p>The Java code I am using is:</p> <pre><code>package durdle.bruce.fragment_trial; import android.app.Fragment; import android.os.Bundle; import android.text.Spannable; import android.text.SpannableStringBuilder; import android.text.style.ForegroundColorSpan; import android.util.Log; import android.view.KeyEvent; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnKeyListener; import android.view.ViewGroup; import android.widget.EditText; import android.widget.TextView; public class PanelFragment extends Fragment implements OnKeyListener { private final String TAG = "Panel Fragment:- "; EditText cmdLine; EditText traffic_panel; int lineCount = 0; CharSequence cs; CharSequence nextLine; SpannableStringBuilder cmdString; SpannableStringBuilder traffic; SpannableStringBuilder ss; ForegroundColorSpan cmdTextColor; ForegroundColorSpan trafTextColor; String cntString; char newLine = '\n'; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.textfragment,container, false); cmdLine = (EditText) view.findViewById(R.id.enterCmd); cmdLine.setOnKeyListener(this); cmdTextColor = new ForegroundColorSpan(0x0000FF); trafTextColor = new ForegroundColorSpan(0xFF0000); traffic = new SpannableStringBuilder(); return view; } public boolean onKey(View v, int keyCode, KeyEvent event) { if ((event.getAction() == KeyEvent.ACTION_DOWN) &amp;&amp; (keyCode == KeyEvent.KEYCODE_ENTER)) { traffic_panel = (EditText) getView().findViewById(R.id.detailsText); cmdString = (SpannableStringBuilder) cmdLine.getText(); Log.d(TAG,"ENTER pressed " + cmdString); cs = String.valueOf(lineCount) + "-" + '\n'; ss = new SpannableStringBuilder(cs); ss.setSpan(trafTextColor,0,ss.length(),Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); traffic = traffic.append(ss); cmdString.setSpan(cmdTextColor,0,cmdString.length(),Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); nextLine = cmdString.append(newLine); traffic = traffic.append(nextLine); Log.d(TAG, "traffic string = " + traffic); ((TextView) traffic_panel).setText(traffic); cmdLine.setText(""); lineCount++; } return false; } } </code></pre> <p>Working code with Html.fromHtml is:</p> <pre><code>package durdle.bruce.fragment_trial; import android.app.Fragment; import android.os.Bundle; import android.text.Html; import android.text.SpannableStringBuilder; import android.text.style.ForegroundColorSpan; import android.util.Log; import android.view.KeyEvent; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnKeyListener; import android.view.ViewGroup; import android.widget.EditText; import android.widget.TextView; public class PanelFragment extends Fragment implements OnKeyListener { private final String TAG = "Panel Fragment:- "; EditText cmdLine; TextView traffic_panel; int lineCount = 0; int oldTrafficLength; int newTrafficLength; CharSequence cs; CharSequence nextLine; SpannableStringBuilder cmdString; SpannableStringBuilder traffic; SpannableStringBuilder ss; ForegroundColorSpan cmdTextColor; ForegroundColorSpan trafTextColor; String cntString; char newLine = '\n'; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.textfragment,container, false); cmdLine = (EditText) view.findViewById(R.id.enterCmd); cmdLine.setOnKeyListener(this); cmdTextColor = new ForegroundColorSpan(0xFF0000); trafTextColor = new ForegroundColorSpan(0x0000FF); traffic = new SpannableStringBuilder(); return view; } public boolean onKey(View v, int keyCode, KeyEvent event) { if ((event.getAction() == KeyEvent.ACTION_DOWN) &amp;&amp; (keyCode == KeyEvent.KEYCODE_ENTER)) { traffic_panel = (TextView) getView().findViewById(R.id.detailsText); cmdString = (SpannableStringBuilder) cmdLine.getText(); Log.d(TAG,"ENTER pressed " + cmdString); cmdString = cmdString.append(newLine); lineCount++; cs = String.valueOf(lineCount) + "-" + '\n'; traffic = traffic.append(Html.fromHtml("&lt;font color=\"blue\"&gt;" + cs + "&lt;/font&gt;")); traffic = traffic.append('\n'); traffic = traffic.append(Html.fromHtml("&lt;font color=\"red\"&gt;" + cmdString + "&lt;/font&gt;")); traffic.append('\n'); ((TextView) traffic_panel).setText(traffic); cmdLine.setText(""); } return false; } </code></pre> <p>}</p>
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