Android programming sets the TextView color setTextColor usage instance

This article illustrates the Android programming setting TextView color setTextColor usage. To share for your reference, the details are as follows:

The android method for setting the color of TextView, setTextColor, is overridden and can pass in two arguments.

public void setTextColor(int color) {
 mTextColor = ColorStateList.valueOf(color);
 updateTextColors();
}
public void setTextColor(ColorStateList colors) {
 if (colors == null) {
  throw new NullPointerException();
 }
 mTextColor = colors;
 updateTextColors();
}

Here's how to use each method to set the color of TextView:

TextView tv = new TextView(this);
tv.setText("Test set TextView's color.");
// plan 1 : Pass in the code argb The value of the way 
tv.setTextColor(Color.rgb(255, 255, 255));

This means passing in the int color value, which is not the int value automatically assigned in the R file, so be careful. This is the color int value constructed by the static methods in the Color class.

Resources resource = (Resources) getBaseContext().getResources();
ColorStateList csl = (ColorStateList) resource.getColorStateList(R.color.my_color);
if (csl != null) {
 tv.setTextColor(csl);
}

This method uses ColorStateList to get the colors configured in xml. Many that need to be configured in xml will need a mapping xml file like this.

Here's another way:

XmlResourceParser xrp = getResources().getXml(R.color.my_color);
try {
 ColorStateList csl = ColorStateList.createFromXml(getResources(), xrp);
 tv.setTextColor(csl);
} catch (Exception e) {
}

All codes:

package com.txlong;
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.widget.TextView;
public class ListViewDemoActivity extends Activity {
 // private ListView listView;
 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  TextView tv = new TextView(this);
  tv.setText("Test set TextView's color.");
  // plan 1 Through: ARGB The value of the way 
  /**
   * set the TextView color as the 0~255's ARGB . These component values
   * should be [0..255], but there is no range check performed, so if they
   * are out of range, the returned color is undefined
   */
//  tv.setTextColor(Color.rgb(255, 255, 255));
  /**
   * set the TextView color as the #RRGGBB #AARRGGBB 'red', 'blue',
   * 'green', 'black', 'white', 'gray', 'cyan', 'magenta', 'yellow',
   * 'lightgray', 'darkgray'
   */
  tv.setTextColor(Color.parseColor("#FFFFFF"));
  /**  The original do not know the above method, with this clumsy method  */
//  String StrColor = null;
//  StrColor = "FFFFFFFF";
//  int length = StrColor.length();
//  if (length == 6) {
//   tv.setTextColor(Color.rgb(
//     Integer.valueOf(StrColor.substring(0, 2), 16),
//     Integer.valueOf(StrColor.substring(2, 4), 16),
//     Integer.valueOf(StrColor.substring(4, 6), 16)));
//  } else if (length == 8) {
//   tv.setTextColor(Color.argb(
//     Integer.valueOf(StrColor.substring(0, 2), 16),
//     Integer.valueOf(StrColor.substring(2, 4), 16),
//     Integer.valueOf(StrColor.substring(4, 6), 16),
//     Integer.valueOf(StrColor.substring(6, 8), 16)));
//  }
  // plan 2 : By resource reference 
//  tv.setTextColor(getResources().getColor(R.color.my_color));
  // plan 3 : Write through the resource file at String.xml In the 
//  Resources resource = (Resources) getBaseContext().getResources();
//  ColorStateList csl = (ColorStateList) resource.getColorStateList(R.color.my_color);
//  if (csl != null) {
//   tv.setTextColor(csl);
//  }
  // plan 4 Through: xml Files, such as /res/text_color.xml
//  XmlPullParser xrp = getResources().getXml(R.color.text_color);
//  try {
//   ColorStateList csl = ColorStateList.createFromXml(getResources(), xrp);
//   tv.setTextColor(csl);
//  } catch (Exception e) {
//  }
  // listView = new ListView(this);
  //
  // Cursor cursor = getContentResolver().query(
  // Uri.parse("content://contacts/people"), null, null, null, null);
  //
  // startManagingCursor(cursor);
  //
  // ListAdapter listAdapter = new SimpleCursorAdapter(this,
  // android.R.layout.simple_expandable_list_item_2, cursor,
  // new String[] { "name", "name" }, new int[] {
  // android.R.id.text1, android.R.id.text2 });
  //
  // listView.setAdapter(listAdapter);
  // setContentView(listView);
  setContentView(tv);
 }
}

String. xml is as follows:

<?xml version="1.0" encoding="utf-8"?>
<resources>
 <string name="hello">Hello World, ListViewDemoActivity!</string>
 <string name="app_name">ListViewDemo</string>
 <color name="my_color">#FFFFFF</color>
</resources>

/res/color/text_color.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:state_pressed="true" android:color="#FF111111"/>
  <!-- pressed -->
  <item android:state_focused="true" android:color="#FF222222"/>
  <!-- focused -->
  <item android:state_selected="true" android:color="#FF333333"/>
  <!-- selected -->
  <item android:state_active="true" android:color="#FF444444"/>
  <!-- active -->
  <item android:state_checkable="true" android:color="#FF555555"/>
  <!-- checkable -->
  <item android:state_checked="true" android:color="#FF666666"/>
  <!-- checked -->
  <item android:state_enabled="true" android:color="#FF777777"/>
  <!-- enabled -->
  <item android:state_window_focused="true" android:color="#FF888888"/>
  <!-- window_focused -->
</selector>

I hope this article has been helpful in Android programming.