android 标签云的实现

package com.js.cloudtags; import java.util.LinkedList; import java.util.Random; import java.util.Vector; import android.content.Context; import android.graphics.Paint; import android.util.AttributeSet; import android.util.TypedValue; import android.view.Gravity; import android.view.View; import android.view.ViewTreeObserver.OnGlobalLayoutListener; import android.view.animation.AlphaAnimation; import android.view.animation.Animation; import android.view.animation.Animation.AnimationListener; import android.view.animation.AnimationSet; import android.view.animation.AnimationUtils; import android.view.animation.Interpolator; import android.view.animation.ScaleAnimation; import android.view.animation.TranslateAnimation; import android.widget.FrameLayout; import android.widget.TextView; public class KeywordsFlow extends FrameLayout implements OnGlobalLayoutListener { public static final int IDX_X = 0; public static final int IDX_Y = 1; public static final int IDX_TXT_LENGTH = 2; public static final int IDX_DIS_Y = 3; /** 由外至内的动画。 */ public static final int ANIMATION_IN = 1; /** 由内至外的动画。 */ public static final int ANIMATION_OUT = 2; /** 位移动画类型：从外围移动到坐标点。 */ public static final int OUTSIDE_TO_LOCATION = 1; /** 位移动画类型：从坐标点移动到外围。 */ public static final int LOCATION_TO_OUTSIDE = 2; /** 位移动画类型：从中心点移动到坐标点。 */ public static final int CENTER_TO_LOCATION = 3; /** 位移动画类型：从坐标点移动到中心点。 */ public static final int LOCATION_TO_CENTER = 4; public static final long ANIM_DURATION = 800l; public static final int MAX = 10; public static final int TEXT_SIZE_MAX = 25; public static final int TEXT_SIZE_MIN = 15; private OnClickListener itemClickListener; private static Interpolator interpolator; private static AlphaAnimation animAlpha2Opaque; private static AlphaAnimation animAlpha2Transparent; private static ScaleAnimation animScaleLarge2Normal, animScaleNormal2Large, animScaleZero2Normal, animScaleNormal2Zero; /** 存储显示的关键字。 */ private Vector<String> vecKeywords; private int width, height; /** * go2Show()中被赋值为true，标识开发人员触发其开始动画显示。<br/> * 本标识的作用是防止在填充keywrods未完成的过程中获取到width和height后提前启动动画。<br/> * 在show()方法中其被赋值为false。<br/> * 真正能够动画显示的另一必要条件：width 和 height不为0。<br/> */ private boolean enableShow; private Random random; /** * @see ANIMATION_IN * @see ANIMATION_OUT * @see OUTSIDE_TO_LOCATION * @see LOCATION_TO_OUTSIDE * @see LOCATION_TO_CENTER * @see CENTER_TO_LOCATION * */ private int txtAnimInType, txtAnimOutType; /** 最近一次启动动画显示的时间。 */ private long lastStartAnimationTime; /** 动画运行时间。 */ private long animDuration; public KeywordsFlow(Context context) { super(context); // TODO Auto-generated constructor stub init(); } public KeywordsFlow(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub init(); } public KeywordsFlow(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // TODO Auto-generated constructor stub init(); } private void init() { lastStartAnimationTime = 0l; animDuration = ANIM_DURATION; random = new Random(); vecKeywords = new Vector<String>(MAX); getViewTreeObserver().addOnGlobalLayoutListener(this); interpolator = AnimationUtils.loadInterpolator(getContext(), android.R.anim.decelerate_interpolator); animAlpha2Opaque = new AlphaAnimation(0.0f, 1.0f); animAlpha2Transparent = new AlphaAnimation(1.0f, 0.0f); animScaleLarge2Normal = new ScaleAnimation(2, 1, 2, 1); animScaleNormal2Large = new ScaleAnimation(1, 2, 1, 2); animScaleZero2Normal = new ScaleAnimation(0, 1, 0, 1); animScaleNormal2Zero = new ScaleAnimation(1, 0, 1, 0); } public long getDuration() { return animDuration; } public void setDuration(long duration) { animDuration = duration; } public boolean feedKeyword(String keyword) { boolean result = false; if (vecKeywords.size() < MAX) { result = vecKeywords.add(keyword); } return result; } /** * 开始动画显示。<br/> * 之前已经存在的TextView将会显示退出动画。<br/> * * @return 正常显示动画返回true；反之为false。返回false原因如下：<br/> * 1.时间上不允许，受lastStartAnimationTime的制约；<br/> * 2.未获取到width和height的值。<br/> */ public boolean go2Show(int animType) { if (System.currentTimeMillis() - lastStartAnimationTime > animDuration) { enableShow = true; if (animType == ANIMATION_IN) { txtAnimInType = OUTSIDE_TO_LOCATION; txtAnimOutType = LOCATION_TO_CENTER; } else if (animType == ANIMATION_OUT) { txtAnimInType = CENTER_TO_LOCATION; txtAnimOutType = LOCATION_TO_OUTSIDE; } disapper(); boolean result = show(); return result; } return false; } private void disapper() { int size = getChildCount(); for (int i = size - 1; i >= 0; i--) { final TextView txt = (TextView) getChildAt(i); if (txt.getVisibility() == View.GONE) { removeView(txt); continue; } FrameLayout.LayoutParams layParams = (LayoutParams) txt.getLayoutParams(); // Log.d("ANDROID_LAB", txt.getText() + " leftM=" + // layParams.leftMargin + " topM=" + layParams.topMargin // + " width=" + txt.getWidth()); int[] xy = new int[] { layParams.leftMargin, layParams.topMargin, txt.getWidth() }; AnimationSet animSet = getAnimationSet(xy, (width >> 1), (height >> 1), txtAnimOutType); txt.startAnimation(animSet); animSet.setAnimationListener(new AnimationListener() { public void onAnimationStart(Animation animation) { } public void onAnimationRepeat(Animation animation) { } public void onAnimationEnd(Animation animation) { txt.setOnClickListener(null); txt.setClickable(false); txt.setVisibility(View.GONE); } }); } } private boolean show() { if (width > 0 && height > 0 && vecKeywords != null && vecKeywords.size() > 0 && enableShow) { enableShow = false; lastStartAnimationTime = System.currentTimeMillis(); int xCenter = width >> 1, yCenter = height >> 1; int size = vecKeywords.size(); int xItem = width / size, yItem = height / size; // Log.d("ANDROID_LAB", "--------------------------width=" + width + // " height=" + height + " xItem=" + xItem // + " yItem=" + yItem + "----------