走马灯成效文字

走马灯效果文字
走马灯效果的代码,对TextView进行一下重写即可:

public class AutoScrollTextView extends TextView {public final static String TAG = AutoScrollTextView.class.getSimpleName();private float mTxtLength = 0f;// 文本长度private float step = 0f;// 文字的横坐标private float y = 10f;// 文字的纵坐标private float mInitX = 0.0f;// 初始文字坐标private float mEndX = 0.0f;// 判断文字左面坐标.private Paint paint = null;// 绘图样式private String text = "";// 文本内容public AutoScrollTextView(Context context) {super(context);}public AutoScrollTextView(Context context, AttributeSet attrs) {super(context, attrs);}public AutoScrollTextView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);}public void init() {paint = getPaint();text = getText().toString();mTxtLength = paint.measureText(text);step = mTxtLength;mInitX = getLeft() + getLayoutParams().width + mTxtLength;mEndX = getLeft() + getLayoutParams().width + mTxtLength * 2;y = getTextSize() + getPaddingTop();invalidate();}@Overridepublic void onDraw(Canvas canvas) {canvas.drawText(text, mInitX - step, y, paint);step += 1;if (step > mEndX) {step = mTxtLength;}invalidate();}}

在Activity中调用一下init()方法即可.

布局文件还是贴一下吧:

<com.ex.AutoScrollTextView        android:id="@+id/TextViewNotice"        android:layout_width="100dp"        android:layout_height="30dp"        android:layout_marginLeft="100dp"        android:layout_marginTop="100dp"        android:background="#EEE"        android:paddingTop="5dp"        android:text="浮动的文字欢饮你......."        android:textColor="#000"        android:textSize="15sp" >    </com.ex.AutoScrollTextView>

今天补上一种系统自带的方法:

<TextView        android:id="@+id/mTxt"        android:layout_width="100dp"        android:layout_height="wrap_content"        android:layout_gravity="center_horizontal"        android:layout_marginTop="100dp"        android:ellipsize="marquee"        android:fadingEdge="none"        android:focusable="true"        android:focusableInTouchMode="true"        android:marqueeRepeatLimit="marquee_forever"        android:scrollHorizontally="true"        android:singleLine="true"        android:text="开放平台成网络淘金下一 ..."        android:textColor="@android:color/white"        android:textSize="18dip" />

直接设置对应TextView的文本内容即可.

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