ViewPager局部滑动指引效果+ScrollView弹性异步加载效果

package com.ElasticScrollView.view; import java.util.Date; import com.ElasticScrollView.cjy.R; import android.content.Context; import android.util.AttributeSet; import android.util.Log; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.view.animation.LinearInterpolator; import android.view.animation.RotateAnimation; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.ProgressBar; import android.widget.ScrollView; import android.widget.TextView; public class ElasticScrollView extends ScrollView { private static final String TAG = "ElasticScrollView"; private final static int RELEASE_To_REFRESH = 0; private final static int PULL_To_REFRESH = 1; private final static int REFRESHING = 2; private final static int DONE = 3; private final static int LOADING = 4; // 实际的padding的距离与界面上偏移距离的比例 private final static int RATIO = 3; private int headContentWidth; private int headContentHeight; private LinearLayout innerLayout; private LinearLayout headView; private ImageView arrowImageView; private ProgressBar progressBar; private TextView tipsTextview; private TextView lastUpdatedTextView; private OnRefreshListener refreshListener; private boolean isRefreshable; private int state; private boolean isBack; private RotateAnimation animation; private RotateAnimation reverseAnimation; private boolean canReturn; private boolean isRecored; private int startY; public ElasticScrollView(Context context) { super(context); init(context); } public ElasticScrollView(Context context, AttributeSet attrs) { super(context, attrs); init(context); } private void init(Context context) { LayoutInflater inflater = LayoutInflater.from(context); innerLayout = new LinearLayout(context); innerLayout.setLayoutParams(new LinearLayout.LayoutParams( LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT)); innerLayout.setOrientation(LinearLayout.VERTICAL); headView = (LinearLayout) inflater.inflate(R.layout.mylistview_head, null); arrowImageView = (ImageView) headView.findViewById(R.id.head_arrowImageView); progressBar = (ProgressBar) headView.findViewById(R.id.head_progressBar); tipsTextview = (TextView) headView.findViewById(R.id.head_tipsTextView); lastUpdatedTextView = (TextView) headView.findViewById(R.id.head_lastUpdatedTextView); measureView(headView); headContentHeight = headView.getMeasuredHeight(); headContentWidth = headView.getMeasuredWidth(); headView.setPadding(0, -1 * headContentHeight, 0, 0); headView.invalidate(); Log.i("size", "width:" + headContentWidth + " height:" + headContentHeight); innerLayout.addView(headView); addView(innerLayout); animation = new RotateAnimation(0, -180, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f); animation.setInterpolator(new LinearInterpolator()); animation.setDuration(250); animation.setFillAfter(true); reverseAnimation = new RotateAnimation(-180, 0, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f); reverseAnimation.setInterpolator(new LinearInterpolator()); reverseAnimation.setDuration(200); reverseAnimation.setFillAfter(true); state = DONE; isRefreshable = false; canReturn = false; } @Override public boolean onTouchEvent(MotionEvent event) { if (isRefreshable) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: if (getScrollY() == 0 && !isRecored) { isRecored = true; startY = (int) event.getY(); Log.i(TAG, "在down时候记录当前位置"); } break; case MotionEvent.ACTION_UP: if (state != REFRESHING && state != LOADING) { if (state == DONE) { // 什么都不做 } if (state == PULL_To_REFRESH) { state = DONE; changeHeaderViewByState(); Log.i(TAG, "由下拉刷新状态，到done状态"); } if (state == RELEASE_To_REFRESH) { state = REFRESHING; changeHeaderViewByState(); onRefresh(); Log.i(TAG, "由松开刷新状态，到done状态"); } } isRecored = false; isBack = false; break; case MotionEvent.ACTION_MOVE: int tempY = (int) event.getY(); if (!isRecored && getScrollY() == 0) { Log.i(TAG, "在move时候记录下位置"); isRecored = true; startY = tempY; } if (state != REFRESHING && isRecored && state != LOADING) { // 可以松手去刷新了 if (state == RELEASE_To_REFRESH) { canReturn = true; if (((tempY - startY) / RATIO < headContentHeight) && (tempY - startY) > 0) { state = PULL_To_REFRESH; changeHeaderViewByState(); Log.i(TAG, "由松开刷新状态转变到下拉刷新状态"); } // 一下子推到顶了 else if (tempY - startY <= 0) { state = DONE; changeHeaderViewByState(); Log.i(TAG, "由松开刷新状态转变到done状态"); } else { // 不用进行特别的操作，只用更新paddingTop的值就行了 } } // 还没有到达显示松开刷新的时候,DONE或者是PULL_To_REFRESH状态 if (state == PULL_To_REFRESH) { canReturn = true; // 下拉到可以进入RELEASE_TO_REFRESH的状态 if ((tempY - startY) / RATIO >= headContentHeight) { state = RELEASE_To_REFRESH; isBack = true; changeHeaderViewByState(); Log.i(TAG, "由done或者下拉刷新状态转变到松开刷新"); } // 上推到顶了 else if (tempY - startY <= 0) { state = DONE; changeHeaderViewByState(); Log.i(TAG, "由DOne或者下拉刷新状态转变到done状态"); } } // done状态下 if (state == DONE) { if (tempY - startY > 0) { state = PULL_To_REFRESH; changeHeaderViewByState(); } } // 更新headView的size if (state == PULL_To_REFRESH) { headView.setPadding(0, -1 * headContentHeight + (tempY - startY) / RATIO, 0, 0); } // 更新headView的paddingTop if (state == RELEASE_To_REFRESH) { headView.setPadding(0, (tempY - startY) / RATIO - headContentHeight, 0, 0); } if (canReturn) { canReturn = false; return true; } } break; } } return super.onTouchEvent(event); } // 当状态改变时候，调用该方法，以更新界面 private void changeHeaderViewByState() { switch (state) { case RELEASE_To_REFRESH: arrowImageView.setVisibility(View.VISIBLE); progressBar.setVisibility(View.GONE); tipsTextview.setVisibility(View.VISIBLE); lastUpdatedTextView.setVisibility(View.VISIBLE); arrowImageView.clearAnimation(); arrowImageView.startAnimation(animation); tipsTextview.setText("松开刷新"); Log.i(TAG, "当前状态，松开刷新"); break; case PULL_To_REFRESH: progressBar.setVisibility(View.GONE); tipsTextview.setVisibility(View.VISIBLE); lastUpdatedTextView.setVisibility(View.VISIBLE); arrowImageView.clearAnimation(); arrowImageView.setVisibility(View.VISIBLE); // 是由RELEASE_To_REFRESH状态转变来的 if (isBack) { isBack = false; arrowImageView.clearAnimation(); arrowImageView.startAnimation(reverseAnimation); tipsTextview.setText("下拉刷新"); } else { tipsTextview.setText("下拉刷新"); } Log.i(TAG, "当前状态，下拉刷新"); break; case REFRESHING: headView.setPadding(0, 0, 0, 0); progressBar.setVisibility(View.VISIBLE); arrowImageView.clearAnimation(); arrowImageView.se