Android滚动公告栏 简单实现Android滚动公告栏
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本文实现的效果，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();
}
}
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