自定義TextView跑馬燈效果，可控制啟動，停止，和速度
Android自帶的跑馬燈效果不太好控制，不能控制速度，不能即時停止和啟動，而且還受焦點的影響蛋疼不已。由于項目需求需要用的可控制性高的跑馬燈效果，所以自己寫了一個自定義的TextView
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注意：在布局文件引用本view時,paddingLeft,paddingRigh都必須為0dp,需要增加這兩個屬性的，大家可以自行修改代碼。
android:ellipsize="marquee" android:singleLine="true" 這兩個屬性也要加上
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public class MarqueeText 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 MarqueeText(Context context) {
super(context);
// TODO Auto-generated constructor stub
}
public MarqueeText(Context context, AttributeSet attrs) {
super(context, attrs);
}
public MarqueeText(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 -= 2;// 滾動速度
scrollTo(currentScrollX, 0);
if (isStop) {
return;
}
if (getScrollX() <= -(this.getWidth())) {
scrollTo(textWidth, 0);
currentScrollX = textWidth;
//return;
}
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 = 0;
startScroll();
}
}
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布局文件：
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="@+id/start"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="start"
android:text="走起" />
<Button
android:id="@+id/stop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="stop"
android:text="停止" />
<Button
android:id="@+id/startfor0"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="startFor0"
android:text="從頭開始" />
<simtice.demo.marqueetext.MarqueeText
android:id="@+id/test"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#339320"
android:ellipsize="marquee"
android:singleLine="true"
android:text="這才是真正的文字跑馬燈效果"
android:textColor="#000000"
android:textSize="20dp" >
</simtice.demo.marqueetext.MarqueeText>
</LinearLayout>
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MainActivity
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public class MainActivity extends Activity {
private MarqueeText test;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
test = (MarqueeText) this.findViewById(R.id.test);
}
public void start(View v) {
test.startScroll();
}
public void stop(View v) {
test.stopScroll();
}
public void startFor0(View v){
test.startFor0();
}
}