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();
}
@Override
public void onDraw(Canvas canvas) {
canvas.drawText(text, mInitX - step, y, paint);
step += 1;
if (step > mEndX) {
step = mTxtLength;
}
invalidate();
}
}
<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>
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" />