tv.setTextColor(this.getResources().getColor(R.color.red));

<?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"
  android:background="@drawable/white"
  >
<TextView
  android:id="@+id/tv01"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="@string/hello"
  android:autoLink="all"
  android:textColor="@color/red"
  />
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <drawable name="white">#FFFFFF</drawable>
  <drawable name="dark">#000000</drawable>
  <drawable name="red">#FF0000</drawable>
</resources>
strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
 <string name="hello">地址：http://yahaitt.javaeye.com</string>
  <string name="app_name">丫梨的笔记本</string>
</resources>

<?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"
  android:background="@drawable/white"
  >
<TextView
  android:id="@+id/tv01"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="@string/hello"
  android:autoLink="all"
  />
</LinearLayout>

package yahaitt.study03_01;
import android.app.Activity;
import android.os.Bundle;
public class Study03_01 extends Activity {    @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
  }
}

<color name="red">#FF0000</color>
<drawable name="red">#FF0000</drawable>
<string name="red">#FF0000</string>

package yahaitt.study03_01;
import android.app.Activity;
import android.content.res.Resources;
import android.graphics.Color;
import android.os.Bundle;
import android.widget.TextView;
public class Study03_01 extends Activity {
  private TextView tv;
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    tv = (TextView)this.findViewById(R.id.tv01);
    //tv.setTextColor(Color.RED);
    //tv.setTextColor(0xff000000);
  }
}