弹慕实现的两种方式

来源：互联网发布：厦门关键词优化编辑：程序博客网时间：2024/05/22 09:40

第一种，属性动画方式：

/** * 弹幕动画 */private int width;private int duration = 5000;List<ObjectAnimator> obj = new ArrayList();class MyHandler extends Handler {   @Override   public void handleMessage(Message msg) {      super.handleMessage(msg);      if(msg.what == 2){         handlers.removeMessages(2);         final View vv = getTView();         int wr = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);         int hr = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);         vv.measure(wr, hr);         int widthr =vv.getMeasuredWidth();         width = DeviceInfoUtils.getScreenWidth(mContext);         final int top = setRandomTopMargin();         if(top==-1){            handlers.sendEmptyMessageDelayed(2, 3000);            return;         }         FrameLayout.LayoutParams txtlp = new FrameLayout.LayoutParams(widthr, ViewGroup.LayoutParams.WRAP_CONTENT);         txtlp.leftMargin = DeviceInfoUtils.getScreenWidth(mContext);         txtlp.topMargin =top;         vv.setTag(top+"");         int time = duration*widthr/width;         containerVG.addView(vv,txtlp);         final ObjectAnimator anim = ObjectAnimator.ofFloat(vv, "translationX", 0,-(width+widthr));         anim.setDuration(duration+time);         anim.setInterpolator(new LinearInterpolator());         anim.addListener(new AnimatorListenerAdapter() {            @Override            public void onAnimationEnd(Animator animation) {               containerVG.removeView(vv);               obj.remove(anim);               existMarginValues.remove(vv.getTag());            }         });         anim.start();         obj.add(anim);         handlers.sendEmptyMessageDelayed(2, 3000);      }   }}

//随机位置弹出

public int setRandomTopMargin() {   int posY = -1;   if (linesCount == 0) {      linesCount = bvHeight / txtheight;   }   if(linesCount==0)return 0;   while (true) {      int randomIndex = (int) (Math.random() * linesCount);      int marginValue = randomIndex * txtheight;      if(existMarginValues.size()==linesCount){         break;      }      if (!existMarginValues.contains(marginValue+"")) {         posY = marginValue;         existMarginValues.add(marginValue+"");         break;      }   }   return posY;}

//动态获取textview

public View getTView() {   TextView vv = new TextView(mContext);   vv.setText(tanmuBean.getDamulist().get(random.nextInt(N)).getTitle());   vv.setGravity(Gravity.CENTER);   vv.setTextColor(white);   vv.setSingleLine();   vv.setTextSize(18);   vv.setBackgroundResource(R.drawable.xueche_text_black);   return vv;}

二，第二种，自定义view（来自网络)

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ObjectAnimator;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.os.Handler;
import android.os.Message;
import android.os.SystemClock;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.LinearInterpolator;
import android.view.animation.TranslateAnimation;
import android.widget.FrameLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;

import com.jxedt.R;
import com.jxedt.bean.TanmuBean;
import com.jxedt.common.Tool;
import com.wuba.android.lib.commons.DeviceInfoUtils;

import java.lang.ref.WeakReference;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.Set;
import java.util.concurrent.ExecutorService;

/**
* Created by

* 会导致严重耗电，发热
*/
public class BarrageView {
private Random random = new Random();
Context mContext;
RelativeLayout containerVG;
int dp_textSize;
public BarrageView(RelativeLayout containerVG,Context mContext,int danmuHeight){
this.containerVG = containerVG;
this.mContext = mContext;
this.danmuHeight = danmuHeight;
tanmuBean = new TanmuBean();
tanmuBean.setItems(new String[]{"测试一下", "弹幕这东", "总是出现各种问题~~", "什么？麻烦！", "哪位大?", "I need your help.",
"测试一下", "弹幕这东西真不好做啊", "总是出现各种问题~~", "也不知道都是为什么？麻烦！", "哪位大神可以帮帮我啊?", "I need your help.",
"测试一下", "弹幕这东西真不好做啊", "总是出", "麻烦！", "哪位大神可以帮帮我啊?", "I need your help."});
N = tanmuBean.getItems().length;
handler = new MyHandler(this);
if (containerVG.getChildCount() > 0) {
return;
}
handler.sendEmptyMessageDelayed(1, 500);
}
public void showTanmuView(String content, int dp_textSize) {
this.dp_textSize = dp_textSize;
final TextView textView = new TextView(mContext);
textView.setTextSize(dp_textSize);
textView.setBackgroundResource(R.drawable.xueche_text_black);
textView.setText(content);
textView.setSingleLine();
textView.setTextColor(Color.WHITE);
int leftMargin = containerVG.getRight() - containerVG.getLeft() - containerVG.getPaddingLeft();
int verticalMargin = getRandomTopMargin();
textView.setTag(verticalMargin);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.ALIGN_PARENT_TOP);
params.topMargin = verticalMargin;

textView.setLayoutParams(params);
Animation anim = createTranslateAnim(mContext, leftMargin, -DeviceInfoUtils.getScreenWidth(mContext));
anim.setAnimationListener(new Animation.AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
}

@Override
public void onAnimationEnd(Animation animation) {
containerVG.removeView(textView);
int verticalMargin = (int) textView.getTag();
existMarginValues.remove(verticalMargin);
}

@Override
public void onAnimationRepeat(Animation animation) {

}
});
textView.startAnimation(anim);
containerVG.addView(textView);
handler.sendEmptyMessageDelayed(1, 2600);//首次进入延迟2秒移动

}

public Animation createTranslateAnim(Context context, int fromX, int toX) {
TranslateAnimation tlAnim = new TranslateAnimation(fromX, toX, 0, 0);
//自动计算时间
long duration = (long) (Math.abs(toX - fromX) * 1.0f / DeviceInfoUtils.getScreenWidth(context) * 4000);
tlAnim.setDuration(duration);
tlAnim.setInterpolator(new LinearInterpolator());
tlAnim.setFillAfter(true);
return tlAnim;
}
//记录当前仍在显示状态的弹幕的位置（避免重复）
private Set existMarginValues = new HashSet<>();
private int linesCount;
private int getRandomTopMargin() {
//计算用于弹幕显示的空间高度
if (validHeightSpace == 0) {
validHeightSpace = containerVG.getBottom() - containerVG.getTop()- containerVG.getPaddingTop() - containerVG.getPaddingBottom();
}

//计算可用的行数
if (linesCount == 0) {
linesCount = validHeightSpace / danmuHeight;
if (linesCount == 0) {
return 0;
// throw new RuntimeException("Not enough space to show text.");
}
}
while (true) {
int randomIndex = (int) (Math.random() * linesCount);
int marginValue = randomIndex * (validHeightSpace / linesCount);
if (!existMarginValues.contains(marginValue)) {
existMarginValues.add(marginValue);
return marginValue;
}
}
}

//父组件的高度
private int validHeightSpace;
private MyHandler handler;
//弹幕内容
private TanmuBean tanmuBean;

//需要在主线城中添加组件
class MyHandler extends Handler {
private WeakReference ref;
MyHandler(BarrageView ac) {
ref = new WeakReference<>(ac);
}
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if (msg.what == 1 && !isPause) {
BarrageView ac = (BarrageView) ref.get();
if (ac != null && ac.tanmuBean != null) {
int index = random.nextInt(N);
String content = ac.tanmuBean.getItems()[index];
int textSize = ac.tanmuBean.getMinTextSize();
ac.showTanmuView(content, textSize);
}
}
}
}
int danmuHeight=0;
int N =0;
boolean isPause = false;

public void setPause(boolean pause) {
isPause = pause;
if(!isPause){
handler.sendEmptyMessageDelayed(1, 500);
}
}
}

//初始化

private void initBarrageView(){for(int i=0;i<3;i++){TextView vv = new TextView(mContext);vv.setVisibility(View.GONE);vv.setId(i);containerVG.addView(vv);}handlers = new MyHandler();handlers.sendEmptyMessageDelayed(2, 0);//首次进入延迟2秒移动}

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