Android自定义textview实现竖直滚动跑马灯效果

本文实例为大家分享了Android自定义textview实现跑马灯效果的具体代码，供大家参考，具体内容如下

xml布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:id="@+id/activity_main"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context="myandroidstituds.test3.MainActivity">

  <LinearLayout
    android:layout_centerInParent="true"
    android:layout_width="180dp"
    android:layout_height="50dp">
  <TextView
    android:padding="10dp"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#55000000"
    />
  </LinearLayout>
  <myandroidstituds.test3.MarqueeLayout
    android:id="@+id/mar"
    android:layout_centerInParent="true"
    android:layout_width="180dp"
    android:layout_height="50dp">
    <TextView
      android:id="@+id/tv1"
      android:textSize="20sp"
      android:gravity="center"
      android:background="@android:color/transparent"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:textColor="#000000"
      android:visibility="gone"
      android:text="两个黄鹂鸣翠柳"
      />
    <TextView
      android:id="@+id/tv2"
      android:textSize="20sp"
      android:background="@android:color/transparent"
      android:gravity="center"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:textColor="#000000"
      android:visibility="gone"
      android:text="一行白鹭上青天"
      />
  </myandroidstituds.test3.MarqueeLayout>
</RelativeLayout>

自定义MarqueeLayout

public class MarqueeLayout extends FrameLayout implements ViewTreeObserver.OnGlobalLayoutListener{
  private View view1;
  private View view2;
  public int interval = 2000;
  public MarqueeLayout(Context context) {
    this(context,null);
  }
  public MarqueeLayout(Context context,AttributeSet attrs) {
    this(context,attrs,0);
  }
  public MarqueeLayout(Context context,AttributeSet attrs,int defStyleAttr) {
    super(context,defStyleAttr);
    getViewTreeObserver().addOnGlobalLayoutListener(this);
  }
  @Override
  protected void onFinishInflate() {
    super.onFinishInflate();
    if(getChildCount()!=2){
      throw new IllegalArgumentException("MarqueeLayout should have 2 child!");
    }
    view1 = getChildAt(0);
    view2 = getChildAt(1);
  }
  @Override
  public void onGlobalLayout() {
    getViewTreeObserver().removeGlobalOnLayoutListener(this);

    view2.setTranslationY(view2.getHeight());
  }

  private Handler handler = new Handler(){
    @Override
    public void handleMessage(Message msg) {
      super.handleMessage(msg);
      startAnim();
    }
  };
  boolean isAniming = false;
  /**
   * 开始滚动
   */
  public void start(){
    getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
      @Override
      public void onGlobalLayout() {
        getViewTreeObserver().removeGlobalOnLayoutListener(this);
        startAnim();
      }
    });
  }
  public void startAnim(){
    if(isAniming)return;

    isAniming = true;
    int targetY1 = view1.getTranslationY()==0?-view1.getHeight():0;
    int targetY2 = view2.getTranslationY()==0?-view2.getHeight():0;

    ViewCompat.animate(view1)
        .translationY(targetY1)
        .setListener(new ViewPropertyAnimatorListenerAdapter(){
          @Override
          public void onAnimationEnd(View view) {
            super.onAnimationEnd(view);
            //移动到下方
            resetView(view);
          }
        })
        .setDuration(400).start();
    ViewCompat.animate(view2)
        .translationY(targetY2)
        .setListener(new ViewPropertyAnimatorListenerAdapter(){
          @Override
          public void onAnimationEnd(View view) {
            super.onAnimationEnd(view);
            //移动到下方
            resetView(view);
            isAniming = false;
            handler.sendEmptyMessageDelayed(0,interval);
          }
        })
        .setDuration(400)
        .start();
  }
  private void resetView(View view) {
    if(view.getTranslationY()==-view.getHeight()){
      view.setTranslationY(view.getHeight()*2);
    }
  }
  public void stop(){
    handler.removeCallbacksAndMessages(null);
  }
}

在Activity中的使用

public class MainActivity extends AppCompatActivity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    MarqueeLayout marqueeLayout = (MarqueeLayout) findViewById(R.id.mar);
    TextView tv1 = (TextView) findViewById(R.id.tv1);
    TextView tv2 = (TextView) findViewById(R.id.tv2);
    marqueeLayout.start();
    tv1.setVisibility(tv1.getTranslationY() == 0 ? View.VISIBLE : View.GONE);
    tv2.setVisibility(tv2.getTranslationY() == 0 ? View.VISIBLE : View.GONE);

  }
}

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编程小技巧。