简单实现Android滚动公告栏

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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