Android右侧字母排序
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import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
public class RightLetterView extends View {
String[] letters = { "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K",
"L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X",
"Y", "Z" };
Paint paint = new Paint();
OnTouchingLetterChangedListener onTouchingLetterChangedListener;
boolean showBkg = false;
int choose = -1;
int lettersLength;
public RightLetterView(Context context) {
super(context);
}
public RightLetterView(Context arg0, AttributeSet arg1, int arg2) {
super(arg0, arg1, arg2);
}
public RightLetterView(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onAttachedToWindow() {
// TODO Auto-generated method stub
super.onAttachedToWindow();
lettersLength = letters.length;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (showBkg) {
canvas.drawColor(Color.parseColor("#10000000")); //画透明黑色背景
}
int height = getHeight();
int width = getWidth();
int singleHeight = height / lettersLength;
for (int i = 0; i < lettersLength; i++) {
paint.setColor(Color.BLACK);
paint.setTypeface(Typeface.DEFAULT_BOLD);
paint.setAntiAlias(true); //平滑
paint.setTextSize(50.0f);
if (i == choose) {
paint.setColor(Color.parseColor("#3399ff"));
paint.setFakeBoldText(true);
}
float xPos = width / 2 - paint.measureText(letters[i]) / 2;
float yPos = singleHeight * (i + 1);
canvas.drawText(letters[i], xPos, yPos, paint);
paint.reset();
}
}
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
final int action = event.getAction();
final float y = event.getY();
final int oldChoose = choose;
final OnTouchingLetterChangedListener listener = onTouchingLetterChangedListener;
final int c = (int) (y / getHeight() * lettersLength);
switch (action) {
case MotionEvent.ACTION_DOWN:
showBkg = true;
if (oldChoose != c && listener != null) {
if (c > 0 && c <= lettersLength) {
listener.onTouchingLetterChanged(letters[c]);
choose = c;
invalidate();
}
}
break;
case MotionEvent.ACTION_MOVE:
if (oldChoose != c && listener != null) {
if (c > 0 && c <= lettersLength) {
listener.onTouchingLetterChanged(letters[c]);
choose = c;
invalidate();
}
}
break;
case MotionEvent.ACTION_UP:
showBkg = false;
choose = -1;
invalidate();
break;
default:
break;
}
return true;
}
@Override
public boolean onTouchEvent(MotionEvent arg0) {
return super.onTouchEvent(arg0);
}
public void setOnTouchingLetterChangedListener(
OnTouchingLetterChangedListener onTouchingLetterChangedListener) {
this.onTouchingLetterChangedListener = onTouchingLetterChangedListener;
}
public interface OnTouchingLetterChangedListener {
public void onTouchingLetterChanged(String s);
}
public void setLetters(String[] letters) {
this.letters = letters;
}
}
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