import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.TextView;
import com.bluezhang.zhufengfm.BuildConfig;
/**
 * Author: blueZhang
 * DATE:2015/10/25
 * Time: 17:35
 * email:[email protected]
 

 */
/**
 * 自定義TextView的跑馬燈的效果
 * 用於解決如果出現事件衝突TextView不能夠獲取焦點
 * 如果可以獲取焦點那麼可以使用如下程式碼
 *
<pre>
android:layout_width="100dip"
           android:layout_height="wrap_content"
           android:layout_gravity="center"
           android:text="走馬燈效果的演示"
           android:singleLine="true"
           android:ellipsize="marquee"
 
           android:focusable="true"
           android:focusableInTouchMode="true"

          <com.bluezhang.zhufengfm.widgets.NewTextView
android:id="@+id/playtrackui_textview_titile_id"
           android:layout_width="160dp"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
 
           android:layout_marginLeft="30dp"
android:layout_toRightOf="@id/playtrackui_imageview_back_id"
android:ellipsize="marquee"
 android:singleLine="true"
 android:text="Title"
 android:textColor="@color/dimgrey"
          android:textSize="17sp"
/>

public class NewTextView extends TextView implements Runnable {
    private int currentScrollX;// 當前滾動的位置
private boolean isStop = false;
    private int textWidth;
    private boolean isMeasure = false;
    public NewTextView(Context context) {
        super(context);
}

    public NewTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
}

    public NewTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
}

    @Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
        if (!isMeasure) {// 文字寬度只需獲取一次就可以了
getTextWidth();
isMeasure = true;
}
    }

    /**
     * 獲取文字寬度
     */
private void getTextWidth() {
        Paint paint = this.getPaint();
String str = this.getText().toString();
textWidth = (int) paint.measureText(str);
}

    @Override
public void run() {
        currentScrollX += 1;// 滾動速度
scrollTo(currentScrollX, 0);
        if (isStop) {
            return;
}
        if (getScrollX() >= (this.getWidth() + textWidth)) {
            scrollTo(-(textWidth + 160), 0);
currentScrollX = -textWidth - 160;
            if (BuildConfig.DEBUG) Log.d("NewTextView", "條件成立");
}
        postDelayed(this, 5);
}

    // 開始滾動
public void startScroll() {
        isStop = false;
        this.removeCallbacks(this);
post(this);
}

    // 停止滾動
public void stopScroll() {
        isStop = true;
}

    // 從頭開始滾動
public void startFor0() {
        currentScrollX = -textWidth - 160;
startScroll();
}
}