textview（跑马灯效果）文字长短不限循环播放代码,Java代码库,德仔网

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【Java】 textview（跑马灯效果）文字长短不限循环播放
作者:JoanneTou / 发布于2012/8/13/ 548
textview显示跑马灯效果，使用的是继承的方法onDraw不停地绘制优点： 1.文字长短不限哦 2.不用非得获取焦点哦
<div><?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="<a href="http://schemas.android.com/apk/res/android">http://schemas.android.com/apk/res/android</a>"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical" ></div>
<div> <LinearLayout
 android:layout_width="wrap_content"
 android:layout_height="wrap_content" ></div>
<div> <feng.f7_27.activity.CustomTextView
 android:id="@+id/textView1"
 android:layout_width="wrap_content"
 android:layout_height="match_parent"
 android:background="#aaffee"/>
 
 </LinearLayout>
 
</LinearLayout></div>
<div></div>
<div></div>
<div>CustomTextView.java</div>
<div>package feng.f7_27.activity;</div>
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.view.Display;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.WindowManager;
import android.widget.TextView;</div>
<div>public class CustomTextView extends TextView implements OnClickListener{
public final static String TAG = CustomTextView.class.getSimpleName();</div>
<div>private float textLength = 0f;//???????
private float viewWidth = 0f;
private float step = 0f;//?????????
private float y = 0f;//??????????
private float temp_view_plus_text_length = 0.0f;//???????????????
private float temp_view_plus_two_text_length = 0.0f;//???????????????
public boolean isStarting = false;//????????
private Paint paint = null;//??????
private String text = "";//???????</div>
<div>
public CustomTextView(Context context) {
super(context);
initView();
}
<div>public CustomTextView(Context context, AttributeSet attrs) {
super(context, attrs);
initView();
}
<div>public CustomTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initView();
}
<div>/** *//**
* ????????
*/
private void initView()
{
setOnClickListener(this);
}
<div>/** *//**
* ??????????&yuml;?&theta;???????????????Ч????????????&sup3;???????
*/
public void init(WindowManager windowManager)
{
paint = getPaint();
text = getText().toString();
textLength = paint.measureText(text);
viewWidth = getWidth();
if(viewWidth == 0)
{
if(windowManager != null)
{
Display display = windowManager.getDefaultDisplay();
viewWidth = display.getWidth();
}
}
step = textLength;
temp_view_plus_text_length = viewWidth + textLength;
temp_view_plus_two_text_length = viewWidth + textLength * 2;
y = getTextSize() + getPaddingTop()+15;
}
@Override
public Parcelable onSaveInstanceState()
{
Parcelable superState = super.onSaveInstanceState();
SavedState ss = new SavedState(superState);</div>
<div>ss.step = step;
ss.isStarting = isStarting;</div>
<div>return ss;</div>
<div>} 
@Override
public void onRestoreInstanceState(Parcelable state)
{
if (!(state instanceof SavedState)) {
super.onRestoreInstanceState(state);
return;
}
SavedState ss = (SavedState)state;
super.onRestoreInstanceState(ss.getSuperState());</div>
<div>step = ss.step;
isStarting = ss.isStarting;</div>
<div>}
<div>public static class SavedState extends BaseSavedState {
public boolean isStarting = false;
public float step = 0.0f;
SavedState(Parcelable superState) {
super(superState);
}
<div>@Override
public void writeToParcel(Parcel out, int flags) {
super.writeToParcel(out, flags);
out.writeBooleanArray(new boolean[]{isStarting});
out.writeFloat(step);
}
<div>
public static final Parcelable.Creator<SavedState> CREATOR
= new Parcelable.Creator<SavedState>() {</div>
<div>public SavedState[] newArray(int size) {
return new SavedState[size];
}
<div>@Override
public SavedState createFromParcel(Parcel in) {
return new SavedState(in);
}
};</div>
<div>private SavedState(Parcel in) {
super(in);
boolean[] b = null;
in.readBooleanArray(b);
if(b != null && b.length > 0)
isStarting = b[0];
step = in.readFloat();
}
}
<div>/** *//**
* ???????
*/
public void startScroll()
{
isStarting = true;
invalidate();
}
<div>/** *//**
* ??????
*/
public void stopScroll()
{
isStarting = false;
invalidate();
}
<div>
@Override
public void onDraw(Canvas canvas) {
canvas.drawText(text, temp_view_plus_text_length - step, y, paint);
if(!isStarting)
{
return;
}
step += 0.5;
if(step > temp_view_plus_two_text_length)
step = textLength;
invalidate();</div>
<div>}
<div>@Override
public void onClick(View v) {
if(isStarting)
stopScroll();
else
startScroll();</div>
<div>}
<div>}
</div>
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　文字长短不限循环播放　
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