android实现滚动文本效果

本文实例为大家分享了android实现滚动文本效果的具体代码，供大家参考，具体内容如下

效果图

实现方法

直接上代码

首先是一个自定义layout，继承自FrameLayout

public class AnimationTextLayout extends FrameLayout { private static final String TAG = 'AnimationTextLayout'; private List<String> tipList; private List<Integer> displayList; private List<TextView> viewList; private List<VirtualPos> virtualPosList; private double deviantAngle = 0; public AnimationTextLayout(@NonNull Context context) { super(context); initView(); } public AnimationTextLayout(@NonNull Context context, @Nullable AttributeSet attrs) { super(context, attrs); initView(); } public AnimationTextLayout(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); initView(); } private void initView() { viewList = new ArrayList<>(); displayList = new ArrayList<>(); virtualPosList = new ArrayList<>(); } /** * 设置需要显示的数据 * * @param data 需要显示的数据 */ public void setData(List<String> data) { this.tipList = data; initTips(); } private void initTips() { while (tipList.size() > viewList.size()) { addTipsView(); } refreshTips(); initVirPos(); post(new Runnable() { @Override public void run() { initPosition(); requestLayout(); } }); } /** * 计算虚拟位置 */ private void initVirPos() { virtualPosList.clear(); for (int i = 0; i < viewList.size(); i++) { double angle = (Math.PI * ((double) i / viewList.size())*2)+(deviantAngle*Math.PI*2); if (angle>Math.PI*2){ angle-=Math.PI*2; } VirtualPos virtualPos = new VirtualPos(); virtualPos.text = tipList.get(i); virtualPos.z = 100 * Math.sin(angle); virtualPos.y = 100 * Math.cos(angle); virtualPosList.add(virtualPos); } } /** * 将虚拟位置转化为实际高度和位置 */ private void initPosition() { for (int i = 0; i < viewList.size(); i++) { TextView textView = viewList.get(i); VirtualPos virtualPos=virtualPosList.get(i); int realY = (int) ((100 - virtualPos.y)/200 *getMeasuredHeight()); FrameLayout.LayoutParams layoutParams = (LayoutParams) textView.getLayoutParams(); layoutParams.topMargin = realY; if (virtualPos.z>=0){ float textSize= (float) (( virtualPos.z)/100)*20+5; textView.setTextSize(textSize); textView.setVisibility(VISIBLE); }else { textView.setVisibility(GONE); } Log.d(TAG, 'initPosition: y=='+realY); } } private void refreshTips() { for (int i = 0; i < viewList.size(); i++) { TextView tip = viewList.get(i); if (i < tipList.size()) { tip.setVisibility(VISIBLE); tip.setText(tipList.get(i)); continue; } tip.setVisibility(GONE); } } private TextView addTipsView() { TextView textView = new TextView(getContext()); textView.setTextSize(COMPLEX_UNIT_DIP, 12); textView.setTextColor(Color.parseColor('#444444')); textView.setPadding(ConvertUtil.dp2px(5), ConvertUtil.dp2px(3), ConvertUtil.dp2px(5), ConvertUtil.dp2px(3)); LayoutParams layoutParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); layoutParams.gravity=Gravity.CENTER_HORIZONTAL; layoutParams.rightMargin = ConvertUtil.dp2px(6); addView(textView, layoutParams); viewList.add(textView); return textView; } /** * 虚拟位置，最大x,y,z 最大值为100，最小值为-100 */ public static class VirtualPos { public double x; public double y; public double z; public String text; } /** * 滚动的偏移值 * @param deviantAngle 最大为1 */ public void setDeviantAngle(float deviantAngle) { this.deviantAngle = deviantAngle; initVirPos(); initPosition(); } public double getDeviantAngle() { return deviantAngle; }}

调用方布局

<FrameLayout xmlns:android='http://schemas.android.com/apk/res/android' xmlns:app='http://schemas.android.com/apk/res-auto' xmlns:tools='http://schemas.android.com/tools' android:layout_width='match_parent' android:layout_height='match_parent' tools:context='.AnimationTextActivity'> <com.lanlengran.test.view.AnimationTextLayout android: android:layout_width='match_parent' android:background='@color/colorAccent' android:layout_height='400dp'/></FrameLayout>

调用方代码

public class AnimationTextActivity extends Activity { private AnimationTextLayout mAnimTextLayout; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_animation_text); mAnimTextLayout = findViewById(R.id.anim_text_layout); List<String> testData = new ArrayList<>(); for (int i = 0; i < 30; i++) { testData.add('测试数据' + i); } mAnimTextLayout.setData(testData); ObjectAnimator animator = ObjectAnimator.ofFloat(mAnimTextLayout, 'deviantAngle', 0f, 1f); animator.setDuration(5000); animator.setRepeatCount(-1); animator.start(); }}

注意事项

此处的动画只是为了演示。可以根据需要改变自定view的改变滚动值的方法，就可以使滚轮滚动。例如将滚动的角度和手指拖动相结合啥的

/** * 滚动的偏移值 * @param deviantAngle 最大为1*/public void setDeviantAngle(float deviantAngle)

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持好吧啦网。