横向无限滚动TextView和竖向无限滚动TextView
一、横向无限滚动TextView
1.自定义HorizontalTextView
public class HorizontalTextView extends android.support.v7.widget.AppCompatTextView implements View.OnClickListener {
public final static String TAG = HorizontalTextView.class.getSimpleName();
private float textLength = 0f;//文本长度
private float viewWidth = 0f;
private float step = 0f;//文字的横坐标
private float y = 0f;//文字的纵坐标
private float temp_view_plus_text_length = 0.0f;//用于计算的临时变量
private float temp_view_plus_two_text_length = 0.0f;//用于计算的临时变量
public boolean isStarting = false;//是否开始滚动
private Paint paint = null;//绘图样式
private String text = "";//文本内容
public HorizontalTextView(Context context) {
super(context);
initView();
}
public HorizontalTextView(Context context, AttributeSet attrs) {
super(context, attrs);
initView();
}
public HorizontalTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initView();
}
private void initView()
{
setOnClickListener(this);
}
public void init(WindowManager windowManager)
{
paint = getPaint();
text = getText().toString();
textLength = paint.measureText(text);
viewWidth = getWidth();
if(viewWidth == 0)
{
if(windowManager != null)
{
Display display = windowManager.getDefaultDisplay();
viewWidth = display.getWidth();
}
}
step = textLength;
temp_view_plus_text_length = viewWidth + textLength;
temp_view_plus_two_text_length = viewWidth + textLength * 2;
y = getTextSize() + getPaddingTop();
}
@Override
public Parcelable onSaveInstanceState()
{
Parcelable superState = super.onSaveInstanceState();
SavedState ss = new SavedState(superState);
ss.step = step;
ss.isStarting = isStarting;
return ss;
}
@Override
public void onRestoreInstanceState(Parcelable state)
{
if (!(state instanceof SavedState)) {
super.onRestoreInstanceState(state);
return;
}
SavedState ss = (SavedState)state;
super.onRestoreInstanceState(ss.getSuperState());
step = ss.step;
isStarting = ss.isStarting;
}
public static class SavedState extends BaseSavedState {
public boolean isStarting = false;
public float step = 0.0f;
SavedState(Parcelable superState) {
super(superState);
}
@Override
public void writeToParcel(Parcel out, int flags) {
super.writeToParcel(out, flags);
out.writeBooleanArray(new boolean[]{isStarting});
out.writeFloat(step);
}
public static final Parcelable.Creator CREATOR
= new Parcelable.Creator() {
public SavedState[] newArray(int size) {
return new SavedState[size];
}
@Override
public SavedState createFromParcel(Parcel in) {
return new SavedState(in);
}
};
private SavedState(Parcel in) {
super(in);
boolean[] b = null;
in.readBooleanArray(b);
if(b != null && b.length > 0)
isStarting = b[0];
step = in.readFloat();
}
}
public void startScroll()
{
isStarting = true;
invalidate();
}
public void stopScroll()
{
isStarting = false;
invalidate();
}
@Override
public void onDraw(Canvas canvas) {
canvas.drawText(text, temp_view_plus_text_length - step, y, paint);
if(!isStarting)
{
return;
}
step += 0.5;//0.5为文字滚动速度。
if(step > temp_view_plus_two_text_length)
step = textLength;
invalidate();
}
@Override
public void onClick(View v) {
if(isStarting)
stopScroll();
else
startScroll();
}
} 2.布局
<***.HorizontalTextView
android:id="@+id/the_htv"
android:layout_width="fill_parent"
android:layout_height="30px"
android:background="#EEE"
android:inputType="text"
android:textColor="#000"
android:textSize="20px" />
注：*** 为包名
3.使用
theHtv.setText("你好呀");
theHtv.init(getActivity().getWindowManager());
theHtv.startScroll();
二、竖向无限滚动TextView
1.自定义VerticalTextView
public class VerticalTextView extends TextSwitcher implements ViewSwitcher.ViewFactory {
private static final int FLAG_START_AUTO_SCROLL = 0;
private static final int FLAG_STOP_AUTO_SCROLL = 1;
private float mTextSize = 16;
private int mPadding = 5;
private int textColor = Color.BLACK;
/**
* @param textSize 字号
* @param padding 内边距
* @param textColor 字体颜色
*/
public void setText(float textSize, int padding, int textColor) {
mTextSize = textSize;
mPadding = padding;
this.textColor = textColor;
}
private OnItemClickListener itemClickListener;
private Context mContext;
private int currentId = -1;
private ArrayList textList;
private Handler handler;
public VerticalTextView(Context context) {
this(context, null);
mContext = context;
}
public VerticalTextView(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
textList = new ArrayList();
}
public void setAnimTime(long animDuration) {
setFactory(this);
Animation in = new TranslateAnimation(0, 0, animDuration, 0);
in.setDuration(animDuration);
in.setInterpolator(new AccelerateInterpolator());
Animation out = new TranslateAnimation(0, 0, 0, -animDuration);
out.setDuration(animDuration);
out.setInterpolator(new AccelerateInterpolator());
setInAnimation(in);
setOutAnimation(out);
}
/**
* 间隔时间
*
* @param time
*/
public void setTextStillTime(final long time) {
handler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case FLAG_START_AUTO_SCROLL:
if (textList.size() > 0) {
currentId++;
setText(textList.get(currentId % textList.size()));
}
handler.sendEmptyMessageDelayed(FLAG_START_AUTO_SCROLL, time);
break;
case FLAG_STOP_AUTO_SCROLL:
handler.removeMessages(FLAG_START_AUTO_SCROLL);
break;
}
}
};
}
/**
* 设置数据源
*
* @param titles
*/
public void setTextList(ArrayList titles) {
textList.clear();
textList.addAll(titles);
currentId = -1;
}
/**
* 开始滚动
*/
public void startAutoScroll() {
handler.sendEmptyMessage(FLAG_START_AUTO_SCROLL);
}
/**
* 停止滚动
*/
public void stopAutoScroll() {
handler.sendEmptyMessage(FLAG_STOP_AUTO_SCROLL);
}
@Override
public View makeView() {
TextView t = new TextView(mContext);
t.setGravity(Gravity.CENTER_VERTICAL | Gravity.CENTER);
t.setMaxLines(1);
t.setPadding(mPadding, mPadding, mPadding, mPadding);
t.setTextColor(textColor);
t.setTextSize(mTextSize);
t.setClickable(true);
t.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (itemClickListener != null && textList.size() > 0 && currentId != -1) {
itemClickListener.onItemClick(currentId % textList.size());
}
}
});
return t;
}
/**
* 设置点击事件监听
*
* @param itemClickListener
*/
public void setOnItemClickListener(OnItemClickListener itemClickListener) {
this.itemClickListener = itemClickListener;
}
/**
* 轮播文本点击监听器
*/
public interface OnItemClickListener {
/**
* 点击回调
*
* @param position 当前点击ID
*/
void onItemClick(int position);
}
} 2.布局
<***.VerticalTextView
android:id="@+id/the_vtv"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
注：*** 为包名
3.使用
数据源
List
titleList .add("哈哈");
titleList .add("呵呵");
titleList .add("嘿嘿");
theVtv.setTextList(titleList);
theVtv.setText(14, 5, Color.RED);//设置属性
theVtv.setTextStillTime(3000);//设置停留时长间隔
theVtv.setAnimTime(300);//设置进入和退出的时间间隔
theVtv.startAutoScroll();
停止滚动
@Override
public void onDestroyView() {
super.onDestroyView();
theVtv.stopAutoScroll();
}