Android(安卓)滚动的公告栏

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();    }}

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