这篇文章主要为大家展示了Android自定义textview如何实现竖直滚动跑马灯效果，内容简而易懂，希望大家可以学习一下，学习完之后肯定会有收获的，下面让小编带大家一起来看看吧。
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xml布局
<?xml version="1.0" encoding="utf-8"?>
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, attrs, 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);
}
}以上就是关于Android自定义textview如何实现竖直滚动跑马灯效果的内容，如果你们有学习到知识或者技能，可以把它分享出去让更多的人看到。
