【特效】【自定义控件】关键字飘飞效果
布局文件
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" > <com.nil.android.keyword.KeywordsFlow android:id="@+id/keywordsFlow" android:layout_width="fill_parent" android:layout_height="fill_parent" /> <Button android:id="@+id/btnIn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:text="in" /> <Button android:id="@+id/btnOut" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentRight="true" android:text="out" /> </RelativeLayout>
自定义控件
package com.nil.android.keyword; 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, 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); // } }
主Activity
package com.nil.android.keyword; 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.widget.Button; import android.widget.TextView; public class MainActivity extends Activity implements OnClickListener { public static final String[] keywords = { "安卓", "IOS", "阅读器", "语音阅读器", "nil",// "androidsj", "语音阅读器", "刘德华", "BEYOND", "百度谷歌",// "作者", "fbreader", "FBReader"}; private KeywordsFlow keywordsFlow; private Button btnIn, btnOut; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_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); 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); } } }
DEMO完整下载路径：http://download.csdn.net/detail/androidsj/5524889