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| public class AutoSwitchView extends AppCompatTextView {
private final int DEFAULT_IDLE_TIME = 3000;
private final int DEFAULT_SWITCH_TIME = 1000;
private int mIdleTime = DEFAULT_IDLE_TIME;
private int mSwitchTime = DEFAULT_SWITCH_TIME;
private Paint mPaint;
private String mCurStr;
private String mNextStr;
private List<String> mContentList;
private int mCurIndex = 0;
private float mCurValue;
private boolean mIsRunning = false;
private ValueAnimator mAnimator;
private Paint.FontMetrics mFontMetrics;
private Runnable mRunnable;
private int mWidth;
private int mPaddingLeft;
private int mPaddingRight;
private int mPaddingTop;
private int mPaddingBottom;
private int mHeight;
private float mTextBaseY;
public AutoSwitchView(Context context) {
super(context);
init(context);
}
public AutoSwitchView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init(context);
}
public AutoSwitchView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context);
}
private void init(Context context) {
mPaint = new Paint();
mPaint.setTextAlign(Paint.Align.CENTER);
mAnimator = ValueAnimator.ofFloat(0, 1);
mAnimator.setStartDelay(mIdleTime);
mAnimator.setDuration(mSwitchTime);
mAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
mCurValue = (float) animation.getAnimatedValue();
if (mCurValue < 1.0) {
invalidate();
}
}
});
mAnimator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation, boolean isReverse) {
if (!mIsRunning) {
return;
}
mCurIndex = (mCurIndex + 1) % mContentList.size();
mCurStr = mContentList.get(mCurIndex);
mNextStr = mContentList.get((mCurIndex + 1) % mContentList.size());
if (mRunnable == null) {
mRunnable = new Runnable() {
@Override
public void run() {
mAnimator.start();
}
};
}
postDelayed(mRunnable, mIdleTime);
}
@Override
public void onAnimationCancel(Animator animation) {
mIsRunning = false;
}
});
}
public void start() {
if (mContentList == null || mContentList.size() == 0)
return;
if (mIsRunning) {
return;
}
if (mContentList.size() > 1) {
mCurStr = mContentList.get(0);
mNextStr = mContentList.get(1);
} else {
mCurStr = mContentList.get(0);
mNextStr = mContentList.get(0);
}
mCurIndex = 0;
mIsRunning = true;
mAnimator.start();
mAnimator.setStartDelay(mIdleTime);
}
public void stop() {
if (mRunnable != null) {
removeCallbacks(mRunnable);
}
mAnimator.cancel();
mIsRunning = false;
mCurIndex = 0;
}
public void setContentList(List<String> contentList) {
if (contentList == null || contentList.size() == 0)
return;
mContentList = contentList;
start();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
mWidth = MeasureSpec.getSize(widthMeasureSpec);
mPaddingLeft = getPaddingLeft();
mPaddingRight = getPaddingRight();
mPaddingTop = getPaddingTop();
mPaddingBottom = getPaddingBottom();
mPaint.setTextSize(getTextSize());
mFontMetrics = mPaint.getFontMetrics();
mTextBaseY = -mFontMetrics.top + mPaddingTop;
mHeight = Math.round(mFontMetrics.bottom - mFontMetrics.top) + mPaddingTop + mPaddingBottom;
setMeasuredDimension(mWidth, mHeight);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
float curStartX = mPaddingLeft + mPaint.measureText(mCurStr) / 2;
float nextStartX = mPaddingLeft + mPaint.measureText(mNextStr) / 2;
float baseY = 2 * mTextBaseY * (0.5f - mCurValue);
if (baseY > 0) {
canvas.drawText(mCurStr, curStartX, baseY, mPaint);
} else {
canvas.drawText(mNextStr, nextStartX, 2 * mTextBaseY + baseY, mPaint);
}
}
}
|