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POImageView doesn't slike on translationX animation
 

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  1. POImageView doesn't slike on translationX animation
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    <p>I'm trying to create a slider, when users fling left or right, this slider will slide animatedly, translation animation. However, it doesn't work in a right way.</p> <pre><code>package pete.android.study.home.scrollingindicator; import android.animation.Animator; import android.animation.AnimatorListenerAdapter; import android.animation.ObjectAnimator; import android.animation.ValueAnimator; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.util.DisplayMetrics; import android.util.Log; import android.view.GestureDetector; import android.view.MotionEvent; import android.view.View; import android.widget.ImageView; public class MainScreen extends Activity { protected ValueAnimator mScrollIndicatorAnimator; protected ValueAnimator mScrollator; protected ImageView mScrollIndicator = null; protected static final int sScrollIndicatorFadeInDuration = 150; protected static final int sScrollIndicatorFadeOutDuration = 650; protected static final int sScrollIndicatorFlashDuration = 650; public static final int PAGE_COUNT = 4; private int mPageWidth = 0; private int mCurrentPage = 0; private int mIndicatorPos = 0; private int mIndicatorSpace = 0; private GestureDetector mGestureDetector; private static final boolean DEBUG = true; private static final String TAG = "indicator"; private Handler mHandler; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); DisplayMetrics displaymetrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(displaymetrics); //ht = displaymetrics.heightPixels; mPageWidth = displaymetrics.widthPixels; mHandler = new Handler(); setupScrollingIndicator(); mGestureDetector = new GestureDetector(this, new LearnGestureListener()); } @Override public boolean onTouchEvent(MotionEvent event) { if (mGestureDetector.onTouchEvent(event)) return true; else return false; } public void setupScrollingIndicator() { if(mScrollIndicator == null) { mScrollIndicator = (ImageView) findViewById(R.id.indicator); } mIndicatorSpace = mPageWidth / PAGE_COUNT; mIndicatorPos = mIndicatorSpace * mCurrentPage; if(DEBUG) { Log.i(TAG, "mIndicatorSpace = " + mIndicatorSpace); Log.i(TAG, "mCurrentPage = " + mCurrentPage); Log.i(TAG, "mIndicatorPos = " + mIndicatorPos); } if(mScrollIndicator.getMeasuredWidth() != mIndicatorSpace) { mScrollIndicator.getLayoutParams().width = mIndicatorSpace; mScrollIndicator.requestLayout(); } mScrollIndicator.setTranslationX(mIndicatorPos); mScrollIndicator.invalidate(); } public void showIndicator() { setupScrollingIndicator(); mScrollIndicator.setVisibility(View.VISIBLE); cancelScrollingAnimations(); mScrollIndicatorAnimator = ObjectAnimator.ofFloat(mScrollIndicator, "alpha", 1f); mScrollIndicatorAnimator.setDuration(sScrollIndicatorFadeInDuration); mScrollIndicatorAnimator.start(); mScrollator = ObjectAnimator.ofFloat(mScrollIndicator, "translationX", mIndicatorPos); mScrollator.setDuration(sScrollIndicatorFlashDuration); mScrollator.start(); } Runnable hideScrollingIndicatorRunnable = new Runnable() { @Override public void run() { hideIndicator(); } }; protected void flashIndicator() { showIndicator(); mHandler.postDelayed(hideScrollingIndicatorRunnable, sScrollIndicatorFlashDuration); } public void hideIndicator() { setupScrollingIndicator(); cancelScrollingAnimations(); mScrollIndicatorAnimator = ObjectAnimator.ofFloat(mScrollIndicator, "alpha", 0f); mScrollIndicatorAnimator.setDuration(sScrollIndicatorFadeOutDuration); mScrollIndicatorAnimator.addListener(new AnimatorListenerAdapter() { private boolean cancelled = false; @Override public void onAnimationCancel(android.animation.Animator animation) { cancelled = true; } @Override public void onAnimationEnd(Animator animation) { if (!cancelled) { mScrollIndicator.setVisibility(View.INVISIBLE); } } }); mScrollIndicatorAnimator.start(); } public void cancelScrollingAnimations() { if(mScrollIndicatorAnimator != null) { mScrollIndicatorAnimator.cancel(); } } public void scrollToRight() { flashIndicator(); mCurrentPage++; if(mCurrentPage &gt;= PAGE_COUNT) { mCurrentPage = 0; } } public void scrollToLeft() { flashIndicator(); mCurrentPage--; if(mCurrentPage &lt; 0) { mCurrentPage = PAGE_COUNT - 1; } } class LearnGestureListener extends GestureDetector.SimpleOnGestureListener { @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { if(e2.getX() - e1.getX() &gt; 50) { scrollToLeft(); } else if(e2.getX() - e1.getX() &lt; 50) { scrollToRight(); } return true; } } } </code></pre> <p>Please help me fix this, thanks very much!</p>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USPete Houston
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. This table or related slice is empty.
 

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