How to dynamically change textColor of my list items?

Question

I have a list in which individual elements are defined in custom_row_views.xml:

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:id="@+id/showtitle" android:textSize="17sp" android:textStyle="bold" android:textColor="#FFFF00" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <TextView android:id="@+id/showdate" android:textSize="14sp" android:textStyle="italic" android:textColor="#CCCCCC" android:layout_width="wrap_content" android:layout_height="wrap_content"/> <TextView android:id="@+id/showsummary" android:textSize="17sp" android:textStyle="normal" android:textColor="#FFFFFF" android:layout_width="wrap_content" android:layout_height="wrap_content"/> </LinearLayout> 

Note that the three text images have different text colors.

Now, based on the setting in the settings, the user must change the text color of the textview elements.

Basically, I see two ways to do this. One uses the theme:

 <resources> <style name="ThemeBlack" parent="@android:style/Theme"> <item name="android:textColor">#FFFFFF</item> <item name="android:typeface">sans</item> <item name="android:background">#999999</item> <item name="android:textSize">16sp</item> </style> <style name="ThemeRed" parent="@android:style/Theme"> <item name="android:textColor">#0000FF</item> <item name="android:typeface">sans</item> <item name="android:background">#c81111</item> <item name="android:textSize">16sp</item> </style> </resources> 

and then in onCreate (), for example:

 this.setTheme(R.style.ThemeRed); 

The problem is that it changes all text colors of textviews to everything that is defined in styles. In other words, they no longer differ from each other. Therefore, my first specific questions:

Is there any way to define or apply styles so that they serve a list that has three text images with separate colors?

Another approach is to simply set the text color programmatically without using styles and themes. This was my first approach, and I thought it would be easy, but I struggled with it for several hours to no avail.

I tried the following in onCreate ListActivity:

 TextView tv = (TextView) findViewById(R.id.showsummary); tv.setTextColor(Color.RED); 

but this causes the application to crash.

Then I tried this:

 TextView tv = null; LayoutInflater inflater = this.getLayoutInflater(); View aView = inflater.inflate(R.layout.custom_row_view, null); tv = (TextView) aView.findViewById(R.id.showsummary); tv.setTextColor(Color.RED); 

This is not a failure, but it does not work either!

So my second question is:

How to change the text color of my list items in code?

Note that all list items must have a new color; The important thing is that three separate text images inside the elements must be individually colored. In other words, I'm not trying to set the colors of a single item in a list.

UPDATE: I don't know if any value matters, but this is how the popuplated listview:

 Cursor showsCursor = mDbHelper.fetchSummaries(mCategory); String[] from = new String[]{C2CDbAdapter.SUMMARY_TITLE, C2CDbAdapter.SUMMARY_DATE, C2CDbAdapter.SUMMARY_SUMMARY}; int[] to = new int[]{R.id.showtitle, R.id.showdate, R.id.showsummary}; SimpleCursorAdapter shows = new SimpleCursorAdapter(this, R.layout.custom_row_view, showsCursor, from, to); setListAdapter(shows); 

Answer 1

After many searches and trial and error, I found a fairly simple solution. This example overrides the adapter’s getView method, creating an anonymous method, but of course, you can also declare a new class based on SimpleCursorAdapter and use it in setListAdapter.

 setListAdapter(new SimpleCursorAdapter(this, R.layout.custom_row_view, showsCursor, from, to) { @Override public View getView(int position, View convertView, ViewGroup parent) { View row = super.getView(position, convertView, parent); // Here we get the textview and set the color TextView tv = (TextView) row.findViewById(R.id.showsummary); tv.setTextColor(Color.YELLOW); return row; } }); 

The best part with the anonymous method is that it can be used on any adapter without the need to subclass this class.

My coding is inspired by this blog post: http://sudarmuthu.com/blog/using-arrayadapter-and-listview-in-android-applications

Answer 2

Is this what you are asking for?

  setContentView(R.layout.main); TextView messageText = (TextView) findViewById(R.id.mainTextItem1); messageText.setText("This is a test"); messageText.setTextColor(Color.RED); 

Beginning of the XML world:

You can select colors using the switch statement. Colors are an int type.

int myColor = 0xffff0000; // This is red

int myColor = Color.RED; // and so on.

messageText.setTextColor (myColor); // now the user can select a color

Answer 3

try installing the tag in your textView, and then find it by the tag and finally set the color using the setTextColor(Color.RED); method setTextColor(Color.RED);