[置顶] 关键字弹出动画

【ActKeywordAnim.java】

package co.cm.cn;

import java.util.Random;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.TextView;

public class ActKeywordAnim extends Activity implements OnClickListener {
	public static final String[] keywords = { "敬飞", "小薛子", "汉子", "小白", "飞爷",
			"咸鱼干", "老于", "带鱼", "蕴子", "老板", "小淫贱", "建平", "小尹子", "老宋", "宋少",
			"阿娇", "国星", "焦爷", "焦羊羊", "蕴逼", "大梅", "老妹", "琪琪", "琪爷", "炮爷", "小钢炮",
			"晋琪", "崔健", "雪梅", "之君", "小贱", "死胖子", "菊花", "潇潇", "洋仔", "基友之家",
			"花逼", "茂升", "贱人", "臭鱼", "开心", "快乐", "幸福", "友爱", "知足", "夜生活", "激情",
			"基情", "小磊子", "小飞子", "小琪子", "小君子", "小洋子", "小宋子", "小梅子", "廷儿", "延廷" };
	private KeywordsFlow keywordsFlow;
	private Button btnIn, btnOut;

	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.main);
		btnIn = (Button) findViewById(R.id.btnIn);
		btnOut = (Button) findViewById(R.id.btnOut);
		btnIn.setOnClickListener(this);
		btnOut.setOnClickListener(this);
		keywordsFlow = (KeywordsFlow) findViewById(R.id.keywordsFlow);
		keywordsFlow.setDuration(800l);// 设置持续时间
		keywordsFlow.setOnItemClickListener(this);
		// 添加
		feedKeywordsFlow(keywordsFlow, keywords);
		keywordsFlow.go2Show(KeywordsFlow.ANIMATION_IN);
	}

	private static void feedKeywordsFlow(KeywordsFlow keywordsFlow, String[] arr) {
		Random random = new Random();
		for (int i = 0; i < KeywordsFlow.MAX; i++) {
			int ran = random.nextInt(arr.length);
			String tmp = arr[ran];
			keywordsFlow.feedKeyword(tmp);
		}
	}

	@Override
	public void onClick(View v) {
		if (v == btnIn) {
			keywordsFlow.rubKeywords();
			// keywordsFlow.rubAllViews();
			feedKeywordsFlow(keywordsFlow, keywords);
			keywordsFlow.go2Show(KeywordsFlow.ANIMATION_IN);
		} else if (v == btnOut) {
			keywordsFlow.rubKeywords();
			// keywordsFlow.rubAllViews();
			feedKeywordsFlow(keywordsFlow, keywords);
			keywordsFlow.go2Show(KeywordsFlow.ANIMATION_OUT);
		} else if (v instanceof TextView) {
			String keyword = ((TextView) v).getText().toString();
			Intent intent = new Intent();
			intent.setAction(Intent.ACTION_VIEW);
			intent.addCategory(Intent.CATEGORY_DEFAULT);
			intent.setData(Uri.parse("http://www.google.com.hk/#q=" + keyword));
			startActivity(intent);
		}
	}
}

【KeywordsFlow.java】

package co.cm.cn;

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;

/**
 * 注意，出包时出混淆包，应在proguard.cfg中加入：<br/>
 * -keep public class * extends android.widget.FrameLayout<br/>
 */
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, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		init();
	}

	public KeywordsFlow(Context context, AttributeSet attrs) {
		super(context, attrs);
		init();
	}

	public KeywordsFlow(Context context) {
		super(context);
		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 + "---------------------------");
			LinkedList<Integer> listX = new LinkedList<Integer>(), listY = new LinkedList<Integer>();
			for (int i = 0; i < size; i++) {
				// 准备随机候选数，分别对应x/y轴位置
				listX.add(i * xItem);
				listY.add(i * yItem + (yItem >> 2));
			}
			// TextView[] txtArr = new TextView[size];
			LinkedList<TextView> listTxtTop = new LinkedList<TextView>();
			LinkedList<TextView> listTxtBottom = new LinkedList<TextView>();
			for (int i = 0; i < size; i++) {
				String keyword = vecKeywords.get(i);
				// 随机颜色
				int ranColor = 0xff000000 | random.nextInt(0x0077ffff);
				// 随机位置，糙值
				int xy[] = randomXY(random, listX, listY, xItem);
				// 随机字体大小
				int txtSize = TEXT_SIZE_MIN
						+ random.nextInt(TEXT_SIZE_MAX - TEXT_SIZE_MIN + 1);
				// 实例化TextView
				final TextView txt = new TextView(getContext());
				txt.setOnClickListener(itemClickListener);
				txt.setText(keyword);
				txt.setTextColor(ranColor);
				txt.setTextSize(TypedValue.COMPLEX_UNIT_SP, txtSize);
				txt.setShadowLayer(2, 2, 2, 0xff696969);
				txt.setGravity(Gravity.CENTER);
				// 获取文本长度
				Paint paint = txt.getPaint();
				int strWidth = (int) Math.ceil(paint.measureText(keyword));
				xy[IDX_TXT_LENGTH] = strWidth;
				// 第一次修正:修正x坐标
				if (xy[IDX_X] + strWidth > width - (xItem >> 1)) {
					int baseX = width - strWidth;
					// 减少文本右边缘一样的概率
					xy[IDX_X] = baseX - xItem + random.nextInt(xItem >> 1);
				} else if (xy[IDX_X] == 0) {
					// 减少文本左边缘一样的概率
					xy[IDX_X] = Math.max(random.nextInt(xItem), xItem / 3);
				}
				xy[IDX_DIS_Y] = Math.abs(xy[IDX_Y] - yCenter);
				txt.setTag(xy);
				if (xy[IDX_Y] > yCenter) {
					listTxtBottom.add(txt);
				} else {
					listTxtTop.add(txt);
				}
			}
			attach2Screen(listTxtTop, xCenter, yCenter, yItem);
			attach2Screen(listTxtBottom, xCenter, yCenter, yItem);
			return true;
		}
		return false;
	}

	/** 修正TextView的Y坐标将将其添加到容器上。 */
	private void attach2Screen(LinkedList<TextView> listTxt, int xCenter,
			int yCenter, int yItem) {
		int size = listTxt.size();
		sortXYList(listTxt, size);
		for (int i = 0; i < size; i++) {
			TextView txt = listTxt.get(i);
			int[] iXY = (int[]) txt.getTag();
			// Log.d("ANDROID_LAB", "fix[  " + txt.getText() + "  ] x:" +
			// iXY[IDX_X] + " y:" + iXY[IDX_Y] + " r2="
			// + iXY[IDX_DIS_Y]);
			// 第二次修正:修正y坐标
			int yDistance = iXY[IDX_Y] - yCenter;
			// 对于最靠近中心点的，其值不会大于yItem<br/>
			// 对于可以一路下降到中心点的，则该值也是其应调整的大小<br/>
			int yMove = Math.abs(yDistance);
			inner: for (int k = i - 1; k >= 0; k--) {
				int[] kXY = (int[]) listTxt.get(k).getTag();
				int startX = kXY[IDX_X];
				int endX = startX + kXY[IDX_TXT_LENGTH];
				// y轴以中心点为分隔线，在同一侧
				if (yDistance * (kXY[IDX_Y] - yCenter) > 0) {
					// Log.d("ANDROID_LAB", "compare:" +
					// listTxt.get(k).getText());
					if (isXMixed(startX, endX, iXY[IDX_X], iXY[IDX_X]
							+ iXY[IDX_TXT_LENGTH])) {
						int tmpMove = Math.abs(iXY[IDX_Y] - kXY[IDX_Y]);
						if (tmpMove > yItem) {
							yMove = tmpMove;
						} else if (yMove > 0) {
							// 取消默认值。
							yMove = 0;
						}
						// Log.d("ANDROID_LAB", "break");
						break inner;
					}
				}
			}
			// Log.d("ANDROID_LAB", txt.getText() + " yMove=" + yMove);
			if (yMove > yItem) {
				int maxMove = yMove - yItem;
				int randomMove = random.nextInt(maxMove);
				int realMove = Math.max(randomMove, maxMove >> 1) * yDistance
						/ Math.abs(yDistance);
				iXY[IDX_Y] = iXY[IDX_Y] - realMove;
				iXY[IDX_DIS_Y] = Math.abs(iXY[IDX_Y] - yCenter);
				// 已经调整过前i个需要再次排序
				sortXYList(listTxt, i + 1);
			}
			FrameLayout.LayoutParams layParams = new FrameLayout.LayoutParams(
					FrameLayout.LayoutParams.WRAP_CONTENT,
					FrameLayout.LayoutParams.WRAP_CONTENT);
			layParams.gravity = Gravity.LEFT | Gravity.TOP;
			layParams.leftMargin = iXY[IDX_X];
			layParams.topMargin = iXY[IDX_Y];
			addView(txt, layParams);
			// 动画
			AnimationSet animSet = getAnimationSet(iXY, xCenter, yCenter,
					txtAnimInType);
			txt.startAnimation(animSet);
		}
	}

	public AnimationSet getAnimationSet(int[] xy, int xCenter, int yCenter,
			int type) {
		AnimationSet animSet = new AnimationSet(true);
		animSet.setInterpolator(interpolator);
		if (type == OUTSIDE_TO_LOCATION) {
			animSet.addAnimation(animAlpha2Opaque);
			animSet.addAnimation(animScaleLarge2Normal);
			TranslateAnimation translate = new TranslateAnimation((xy[IDX_X]
					+ (xy[IDX_TXT_LENGTH] >> 1) - xCenter) << 1, 0,
					(xy[IDX_Y] - yCenter) << 1, 0);
			animSet.addAnimation(translate);
		} else if (type == LOCATION_TO_OUTSIDE) {
			animSet.addAnimation(animAlpha2Transparent);
			animSet.addAnimation(animScaleNormal2Large);
			TranslateAnimation translate = new TranslateAnimation(0, (xy[IDX_X]
					+ (xy[IDX_TXT_LENGTH] >> 1) - xCenter) << 1, 0,
					(xy[IDX_Y] - yCenter) << 1);
			animSet.addAnimation(translate);
		} else if (type == LOCATION_TO_CENTER) {
			animSet.addAnimation(animAlpha2Transparent);
			animSet.addAnimation(animScaleNormal2Zero);
			TranslateAnimation translate = new TranslateAnimation(0,
					(-xy[IDX_X] + xCenter), 0, (-xy[IDX_Y] + yCenter));
			animSet.addAnimation(translate);
		} else if (type == CENTER_TO_LOCATION) {
			animSet.addAnimation(animAlpha2Opaque);
			animSet.addAnimation(animScaleZero2Normal);
			TranslateAnimation translate = new TranslateAnimation(
					(-xy[IDX_X] + xCenter), 0, (-xy[IDX_Y] + yCenter), 0);
			animSet.addAnimation(translate);
		}
		animSet.setDuration(animDuration);
		return animSet;
	}

	/**
	 * 根据与中心点的距离由近到远进行冒泡排序。
	 * 
	 * @param endIdx
	 *            起始位置。
	 * @param txtArr
	 *            待排序的数组。
	 * 
	 */
	private void sortXYList(LinkedList<TextView> listTxt, int endIdx) {
		for (int i = 0; i < endIdx; i++) {
			for (int k = i + 1; k < endIdx; k++) {
				if (((int[]) listTxt.get(k).getTag())[IDX_DIS_Y] < ((int[]) listTxt
						.get(i).getTag())[IDX_DIS_Y]) {
					TextView iTmp = listTxt.get(i);
					TextView kTmp = listTxt.get(k);
					listTxt.set(i, kTmp);
					listTxt.set(k, iTmp);
				}
			}
		}
	}

	/** A线段与B线段所代表的直线在X轴映射上是否有交集。 */
	private boolean isXMixed(int startA, int endA, int startB, int endB) {
		boolean result = false;
		if (startB >= startA && startB <= endA) {
			result = true;
		} else if (endB >= startA && endB <= endA) {
			result = true;
		} else if (startA >= startB && startA <= endB) {
			result = true;
		} else if (endA >= startB && endA <= endB) {
			result = true;
		}
		return result;
	}

	private int[] randomXY(Random ran, LinkedList<Integer> listX,
			LinkedList<Integer> listY, int xItem) {
		int[] arr = new int[4];
		arr[IDX_X] = listX.remove(ran.nextInt(listX.size()));
		arr[IDX_Y] = listY.remove(ran.nextInt(listY.size()));
		return arr;
	}

	public void onGlobalLayout() {
		int tmpW = getWidth();
		int tmpH = getHeight();
		if (width != tmpW || height != tmpH) {
			width = tmpW;
			height = tmpH;
			show();
		}
	}

	public Vector<String> getKeywords() {
		return vecKeywords;
	}

	public void rubKeywords() {
		vecKeywords.clear();
	}

	/** 直接清除所有的TextView。在清除之前不会显示动画。 */
	public void rubAllViews() {
		removeAllViews();
	}

	public void setOnItemClickListener(OnClickListener listener) {
		itemClickListener = listener;
	}

	// public void onDraw(Canvas canvas) {
	// super.onDraw(canvas);
	// Paint p = new Paint();
	// p.setColor(Color.BLACK);
	// canvas.drawCircle((width >> 1) - 2, (height >> 1) - 2, 4, p);
	// p.setColor(Color.RED);
	// }
}

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