Android TextView显示彩字
一. 實現很簡單，就是對顏色進行線性的漸變。用到的類是LinearGradient.直接貼代碼：
public class Test extends Activity {
private TextViewTest mTextViewTest;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mTextViewTest = new TextViewTest(this);
setContentView(mTextViewTest);
}
public class TextViewTest extends TextView {
private LinearGradient mGradient;
private int[] mGradientColors= { Color.RED, Color.rgb(255, 165, 0),
Color.YELLOW, Color.GREEN, Color.rgb(0, 255, 255), Color.BLUE,
Color.rgb(160, 32, 240) };
private int mTitleWidth;
private String mTitle = "三十六天罡,七十二地煞,乃是天地正邪之氣所生,如今奉命下凡轉世為科學家.但法用以正,則可以造福人群;";
public TextViewTest(Context context) {
super(context);
// TODO Auto-generated constructor stub
setLayoutParams(new https://www.360docs.net/doc/2113504093.html,youtParams(
https://www.360docs.net/doc/2113504093.html,youtParams.FILL_PARENT,
https://www.360docs.net/doc/2113504093.html,youtParams.FILL_PARENT));
setWillNotDraw(false);
}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
measure(0, 0);
Paint paint = new Paint();
paint.setStyle(Style.FILL_AND_STROKE);
mGradient = new LinearGradient(0, 0, getWidth(),
getMeasuredHeight(), mGradientColors, null, TileMode.REPEAT);
paint.setShader(mGradient);
mTitleWidth = 0;
float[] width = new float[mTitle.length()];
paint.getTextWidths(mTitle, width);
Log.i("Tag", "Width.length= " + width.length);
int start = 0;
int offsetY = 10;
for (int j = 0; j < mTitle.length(); j++) {
mTitleWidth += (int) Math.ceil(width[j]);
if (mTitleWidth > getWidth()) {
canvas.drawText(mTitle.substring(start, j), 0, offsetY,
paint);
mTitleWidth = 0;
start = start + j;
offsetY = offsetY + getMeasuredHeight() + 5;
j--;
}
}
if (mTitleWidth > 0) {
canvas.drawText(mTitle.substring(start), 0, offsetY, paint);
}
}
}
}
二. 實例圖
三. 轉載請尊重原創，這裡是https://www.360docs.net/doc/2113504093.html,/ljlkings/home的空間。