简单实现Android滚动公告栏

Danica ·

更新时间:2024-11-14

· 667 次阅读

实现的效果，是一个滚动的公告栏，是这样的：

可以看到这个公告栏一方面是滚动，另外一方面是可点击。

实现的思路：

1.textView放在ViewFlipper中实现滑动效果（可设置左右、或者上下滚动），很明显这应该是自定义view；

2.利用textView的点击事件即可实现点击；

OK，先看看自定义view的代码：


public class MarqueeTextView extends LinearLayout { 
 private Context mContext; 
 private ViewFlipper viewFlipper; 
 private View marqueeTextView; 
 private String[] textArrays; 
 private MarqueeTextViewClickListener marqueeTextViewClickListener; 
 public MarqueeTextView(Context context) { 
 super(context); 
 mContext = context; 
 initBasicView(); 
 } 
 public MarqueeTextView(Context context, AttributeSet attrs) { 
 super(context, attrs); 
 mContext = context; 
 initBasicView(); 
 } 
 public void setTextArraysAndClickListener(String[] textArrays, MarqueeTextViewClickListener marqueeTextViewClickListener) {//1.设置数据源；2.设置监听回调（将textView点击事件传递到目标界面进行操作） 
 this.textArrays = textArrays; 
 this.marqueeTextViewClickListener = marqueeTextViewClickListener; 
 initMarqueeTextView(textArrays, marqueeTextViewClickListener); 
 } 
 public void initBasicView() {//加载布局，初始化ViewFlipper组件及效果 
 marqueeTextView = LayoutInflater.from(mContext).inflate(R.layout.marquee_textview_layout, null); 
 LayoutParams layoutParams = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); 
 addView(marqueeTextView, layoutParams); 
 viewFlipper = (ViewFlipper) marqueeTextView.findViewById(R.id.viewFlipper); 
 viewFlipper.setInAnimation(AnimationUtils.loadAnimation(mContext, R.anim.slide_in_bottom));//设置上下的动画效果（自定义动画，所以改左右也很简单） 
 viewFlipper.setOutAnimation(AnimationUtils.loadAnimation(mContext, R.anim.slide_out_top)); 
 viewFlipper.startFlipping(); 
 } 
 public void initMarqueeTextView(String[] textArrays, MarqueeTextViewClickListener marqueeTextViewClickListener) { 
 if (textArrays.length == 0) { 
  return; 
 } 
 int i = 0; 
 viewFlipper.removeAllViews(); 
 while (i < textArrays.length) { 
  TextView textView = new TextView(mContext); 
  textView.setText(textArrays[i]); 
  textView.setOnClickListener(marqueeTextViewClickListener); 
  LayoutParams lp = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); 
  viewFlipper.addView(textView, lp); 
  i++; 
 } 
 } 
 public void releaseResources() { 
 if (marqueeTextView != null) { 
  if (viewFlipper != null) { 
  viewFlipper.stopFlipping(); 
  viewFlipper.removeAllViews(); 
  viewFlipper = null; 
  } 
  marqueeTextView = null; 
 } 
 } 
}

然后，主Activity异常简单（还是封装得好）：


public class MainActivity extends AppCompatActivity { 
 private MarqueeTextView marqueeTv; 
 private String [] textArrays = new String[]{"this is content No.1","this is content No.2","this is content No.3"}; 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.activity_main); 
 marqueeTv = (MarqueeTextView) findViewById(R.id.marqueeTv); 
 marqueeTv.setTextArraysAndClickListener(textArrays, new MarqueeTextViewClickListener() { 
  @Override 
  public void onClick(View view) { 
  startActivity(new Intent(MainActivity.this,AnotherActivity.class)); 
  } 
 }); 
 } 
 @Override 
 protected void onDestroy() { 
 marqueeTv.releaseResources(); 
 super.onDestroy(); 
 } 
}

Git地址>>https://github.com/ganshenml/MarqueeTextViewApp

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公告栏 Android

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