Android 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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