效果图：
布局去指定
view.custom.shangguigucustomview.MyCustomIndexView 自定义View对象
<!-- 自定义联系人快速索引 -->
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".ShangGuiguTestActivity"> <ListView
android:layout_width="match_parent"
android:layout_height="wrap_content">
</ListView> <TextView
android:id="@+id/tv_word"
android:layout_width="80dp"
android:layout_height="80dp"
android:background="#22000000"
android:layout_centerInParent="true"
android:textSize="40dp"
android:textColor="@android:color/black"
android:gravity="center_horizontal|center_vertical"
android:visibility="gone"
/> <view.custom.shangguigucustomview.MyCustomIndexView
android:id="@+id/mycustom_indexview"
android:layout_width="30dp"
android:layout_height="match_parent"
android:layout_alignParentRight="true"
android:background="#f00000"
/> </RelativeLayout>
自定义联系人快速索引处理类：
public class MyCustomIndexView extends View { // 为什么是继承View，因为不需要操纵孩子，只需要操纵TextView
private static final String TAG = MyCustomIndexView.class.getSimpleName();
private String[] words = {"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"};
private IMyCustomIndexBack iBack2;
public void setBack(IMyCustomIndexBack iBack2) {
this.iBack2 = iBack2;
}
private Paint paint;
public MyCustomIndexView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
paint = new Paint();
paint.setTextSize(40);
paint.setAntiAlias(true);
paint.setTypeface(Typeface.DEFAULT_BOLD);
paint.setColor(Color.WHITE);
}
private int indexViewWidth;
private int itemIndexViewHeight;
private int heightMeasureSpec;
private int itemHeight;
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
itemIndexViewHeight = heightMeasureSpec / words.length;
indexViewWidth = widthMeasureSpec;
this.heightMeasureSpec = heightMeasureSpec;
// setMeasuredDimension(indexViewWidth, indexViewHeight);
// itemHeight = getMeasuredHeight() / words.length;
itemHeight = MeasureSpec.getSize(heightMeasureSpec) / words.length;
Log.i(TAG, "高度实验: getMeasuredHeight():"+getMeasuredHeight() + " heightMeasureSpec:" + heightMeasureSpec);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
int w = MeasureSpec.getSize(indexViewWidth);
int h = MeasureSpec.getSize(itemIndexViewHeight);
int defaultH = MeasureSpec.getSize(heightMeasureSpec);
int defaultH26 = defaultH / words.length;
for (int i=0; i<words.length;i++) {
if (wordIndexValue==i) {
paint.setColor(Color.BLACK);
paint.setTextSize(50);
} else {
paint.setColor(Color.WHITE);
paint.setTextSize(40);
}
String word = words[i];
// 我要得到字体到宽度
Rect rect = new Rect();
// 需要用到画笔 把值处理好传递给Rect
paint.getTextBounds(word, 0, 1, rect);
canvas.drawText(word, (w/2) - rect.width()/2, i==0?defaultH26:defaultH26*(i+1), paint);
}
}
private int wordIndexValue = -1;
private int tempWordIndexValue;
@Override
public boolean onTouchEvent(MotionEvent event) {
super.onTouchEvent(event);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_MOVE:
/*float endY = event.getY();
Log.i(TAG, "endy:" + endY);
// 得到字母索引
int abcIndex = (int) (endY / itemIndexViewHeight);
Log.i(TAG, "abcIndex:" + abcIndex);*/
float Y = event.getY();
wordIndexValue = (int) (Y/itemHeight);//字母索引
Log.i(TAG, "wordIndexValue;" + wordIndexValue);
if (tempWordIndexValue != wordIndexValue) {
iBack2.back(wordIndexValue, words[wordIndexValue]);
}
tempWordIndexValue = wordIndexValue;
invalidate();
break;
case MotionEvent.ACTION_UP:
iBack2.upEnd();
tempWordIndexValue = 0;
wordIndexValue = -1;
invalidate();
break;
default:
break;
}
return true;
}
}如何使用自定义联系人快速索引：
/**
* 自定义联系人快速索引
*/
tv_word = (TextView) findViewById(R.id.tv_word); final MyCustomIndexView myCustomIndexView = findViewById(R.id.mycustom_indexview);
myCustomIndexView.setBack(new IMyCustomIndexBack() {
@Override
public void back(int index, String word) {
tv_word.setVisibility(View.VISIBLE);
tv_word.setText(word);
// Toast.makeText(MainActivity.this, "index:" + index + " word:" + word, Toast.LENGTH_SHORT).show();
} @Override
public void upEnd() {
handler.sendEmptyMessageDelayed(0, 0);
}
});
/**
* 自定义联系人快速索引
*/
private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
AlphaAnimation alphaAnimation = new AlphaAnimation(1.0f, 0.0f);
alphaAnimation.setDuration(3000);
alphaAnimation.setFillAfter(true); tv_word.startAnimation(alphaAnimation);
// tv_word.setVisibility(View.GONE);
}
};