橫向無限滾動TextView和豎向無限滾動TextView
阿新 • • 發佈：2018-12-04
一、橫向無限滾動TextView
1.自定義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;//文字長度 private float viewWidth = 0f; private float step = 0f;//文字的橫座標 private float y = 0f;//文字的縱座標 private float temp_view_plus_text_length = 0.0f;//用於計算的臨時變數 private float temp_view_plus_two_text_length = 0.0f;//用於計算的臨時變數 public boolean isStarting = false;//是否開始滾動 private Paint paint = null;//繪圖樣式 private String text = "";//文字內容 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<SavedState> CREATOR = new Parcelable.Creator<SavedState>() { 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為文字滾動速度。 if(step > temp_view_plus_two_text_length) step = textLength; invalidate(); } @Override public void onClick(View v) { if(isStarting) stopScroll(); else startScroll(); } }
2.佈局
<***.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：*** 為包名
3.使用
theHtv.setText("你好呀");
theHtv.init(getActivity().getWindowManager());
theHtv.startScroll();
二、豎向無限滾動TextView
1.自定義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 字號 * @param padding 內邊距 * @param textColor 字型顏色 */ 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<String> 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<String>(); } 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); } /** * 間隔時間 * * @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; } } }; } /** * 設定資料來源 * * @param titles */ public void setTextList(ArrayList<String> titles) { textList.clear(); textList.addAll(titles); currentId = -1; } /** * 開始滾動 */ public void startAutoScroll() { handler.sendEmptyMessage(FLAG_START_AUTO_SCROLL); } /** * 停止滾動 */ 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; } /** * 設定點選事件監聽 * * @param itemClickListener */ public void setOnItemClickListener(OnItemClickListener itemClickListener) { this.itemClickListener = itemClickListener; } /** * 輪播文字點選監聽器 */ public interface OnItemClickListener { /** * 點選回撥 * * @param position 當前點選ID */ void onItemClick(int position); } }
2.佈局
<***.VerticalTextView
android:id="@+id/the_vtv"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
注：*** 為包名
3.使用
資料來源
List<String> titleList = new ArrayList<>();
titleList .add("哈哈");
titleList .add("呵呵");
titleList .add("嘿嘿");
theVtv.setTextList(titleList);
theVtv.setText(14, 5, Color.RED);//設定屬性
theVtv.setTextStillTime(3000);//設定停留時長間隔
theVtv.setAnimTime(300);//設定進入和退出的時間間隔
theVtv.startAutoScroll();
停止滾動
@Override
public void onDestroyView() {
super.onDestroyView();
theVtv.stopAutoScroll();
}