引用：http://hi.baidu.com/%CE%D2%B5%C4%B5%D8%C5%CC_007/blog/item/1fe58833bf251e55ac4b5f6d.html
对于Android 2.1来说Live Wallpapers动态壁纸的加入为Android桌面加入了更好的动态效果。如何开发一个Android动态桌面呢? 下面eoe给大家一个详细的步骤创建属于你自己的Live Wallpaper吧。
1. 首先我使用Eclipse创建一个标准的Android工程这里package name然后进入工程的/res/文件夹，删除layout这个文件夹，当然里面的main.xml也会被删除的，对于Live Wallpaper来说传统的布局文件是不需要的。
2. 类似AppWidget一样，我们可以加入动态壁纸的设置界面，我们在/res/文件夹中新建一个名为xml的文件夹，新建一个utf8编码的xml文件，名为livewallpaper.xml，内容为
Java代码：
<?xml version="1.0" encoding="utf-8"?>
<wallpaper xmlns:android="http://schemas.android.com/apk/res/android"
android:thumbnail="@drawable/icon"/> 这里解决了动态壁纸列表界面icon图片问题
这里我们可以看到上面的节点名为wallpaper，而设置的界面为.而在添加动态壁纸时显示图为/res/drawable/icon 这个文件，同时我们再创建一个xml文件用于LiveWallpaperSettings这个Activity的布局，我们起名为livewallpaper_settings.xml内容为
Java代码：
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
android:title="@string/livewallpaper_settings"
android:key="livewallpaper_settings">
<ListPreference
android:key="livewallpaper_testpattern"
android:title="标题"
android:summary="简单描述"
android:entries="@array/livewallpaper_testpattern_names"
android:entryValues="@array/livewallpaper_testpattern_prefix"/>
<CheckBoxPreference android:key="livewallpaper_movement"
android:summary="动态描述"
android:title="动态标题"
android:summaryOn="动态测试"
android:summaryOff="静止测试"/>
</PreferenceScreen>
创建一个名为LiveWallpaper的类作为动态壁纸的主类，从WallpaperService父类继承，这里我们可以像写标准Android服务那样开发，代码为
Java代码：
public class LiveWallpaper extends WallpaperService
{
public static final String SHARED_PREFS_NAME = "livewallpapersettings";
@Override
public void onCreate()
{
super.onCreate();
}
@Override
public void onDestroy()
{
super.onDestroy();
}
@Override
public Engine onCreateEngine()
{
return new TestPatternEngine();
}
class TestPatternEngine extends Engine implements
SharedPreferences.OnSharedPreferenceChangeListener
{
private final Handler mHandler = new Handler();
private float mTouchX = -1;
private float mTouchY = -1;
private final Paint mPaint = new Paint();
private final Runnable mDrawPattern = new Runnable()
{
public void run()
{
drawFrame();
}
};
private boolean mVisible;
private SharedPreferences mPreferences;
private Rect mRectFrame;
private Rect[] mColorRectangles;
private int[] rectColor;
private int mRectCount;
// private
private Rect mGradientRect;
GradientDrawable mGradient;
private boolean mHorizontal = false;
private int mFrameCounter = 0;
private boolean mMotion = true;
private String mShape = "smpte";
TestPatternEngine()
{
final Paint paint = mPaint;
paint.setColor(0xffffffff);
paint.setAntiAlias(true);
paint.setStrokeWidth(2);
paint.setStrokeCap(Paint.Cap.ROUND);
paint.setStyle(Paint.Style.STROKE);
mPreferences = LiveWallpaper.this.getSharedPreferences(SHARED_PREFS_NAME, 0);
mPreferences.registerOnSharedPreferenceChangeListener(this);
onSharedPreferenceChanged(mPreferences, null);
}
public void onSharedPreferenceChanged(SharedPreferences prefs,
String key)
{
mShape = prefs.getString("livewallpaper_testpattern", "smpte");
mMotion = prefs.getBoolean("livewallpaper_movement", true);
readColors();
}
private void readColors()
{
int pid = getResources().getIdentifier(mShape + "colors", "array", getPackageName());
rectColor = getResources().getIntArray(pid);
mRectCount = rectColor.length;
mColorRectangles = new Rect[mRectCount];
System.out.println("mRectCount "+mRectCount);
initFrameParams();
}
@Override
public void onCreate(SurfaceHolder surfaceHolder)
{
super.onCreate(surfaceHolder);
setTouchEventsEnabled(true);
}
@Override
public void onDestroy()
{
super.onDestroy();
mHandler.removeCallbacks(mDrawPattern);
}
@Override
public void onVisibilityChanged(boolean visible)
{
mVisible = visible;
if (visible)
{
drawFrame();
}
else
{
mHandler.removeCallbacks(mDrawPattern);
}
}
@Override
public void onSurfaceChanged(SurfaceHolder holder, int format,
int width, int height)
{
super.onSurfaceChanged(holder, format, width, height);
initFrameParams();
drawFrame();
}
@Override
public void onSurfaceCreated(SurfaceHolder holder)
{
super.onSurfaceCreated(holder);
}
@Override
public void onSurfaceDestroyed(SurfaceHolder holder)
{
super.onSurfaceDestroyed(holder);
mVisible = false;
mHandler.removeCallbacks(mDrawPattern);
}
@Override
public void onOffsetsChanged(float xOffset, float yOffset, float xStep,
float yStep, int xPixels, int yPixels)
{
drawFrame();
}
@Override
public void onTouchEvent(MotionEvent event)
{
if (event.getAction() == MotionEvent.ACTION_MOVE)
{
mTouchX = event.getX();
mTouchY = event.getY();
}
else
{
mTouchX = -1;
mTouchY = -1;
}
super.onTouchEvent(event);
}
void drawFrame()
{
final SurfaceHolder holder = getSurfaceHolder();
Canvas c = null;
try
{
c = holder.lockCanvas();
if (c != null)
{
// draw something
drawPattern(c);
drawTouchPoint(c);
}
}
finally
{
if (c != null)
holder.unlockCanvasAndPost(c);
}
mHandler.removeCallbacks(mDrawPattern);
if (mVisible)
{
mHandler.postDelayed(mDrawPattern, 1000 / 25);
}
}
void drawPattern(Canvas c)
{
c.save();
c.drawColor(0xff000000);
Paint paint = new Paint();
if (mMotion)
{
mFrameCounter++;
if (mHorizontal)
{
int right;
int left;
if (mFrameCounter > mRectFrame.right)
mFrameCounter = 0;
for (int i = 0; i < mRectCount; i++)
{
paint.setColor(rectColor[i]);
right = mColorRectangles[i].right + mFrameCounter;
left = mColorRectangles[i].left + mFrameCounter;
if(right > mRectFrame.right)
{
c.drawRect(left - mRectFrame.right, mColorRectangles[i].top, right - mRectFrame.right, mColorRectangles[i].bottom, paint);
}
if(left < mRectFrame.right)
{
c.drawRect(left, mColorRectangles[i].top, right, mColorRectangles[i].bottom, paint);
}
}
if(mShape.compareToIgnoreCase("smpte") == 0)
{
right =mGradientRect.right + mFrameCounter;
left = mGradientRect.left + mFrameCounter;
if(right > mRectFrame.right)
{
mGradient.setBounds(left - mRectFrame.right, mGradientRect.top, right - mRectFrame.right, mGradientRect.bottom);
mGradient.draw(c);
}
if(left < mRectFrame.right)
{
mGradient.setBounds(left, mGradientRect.top, right, mGradientRect.bottom);
mGradient.draw(c);
}
}
}
else
{
int top;
int bottom;
if (mFrameCounter > mRectFrame.bottom)
mFrameCounter = 0;
for (int i = 0; i < mRectCount; i++)
{
paint.setColor(rectColor[i]);
top = mColorRectangles[i].top + mFrameCounter;
bottom = mColorRectangles[i].bottom + mFrameCounter;
if(bottom > mRectFrame.bottom)
{
c.drawRect(mColorRectangles[i].left, top - mRectFrame.bottom, mColorRectangles[i].right, bottom - mRectFrame.bottom, paint);
}
if(top < mRectFrame.bottom)
{
c.drawRect(mColorRectangles[i].left, top, mColorRectangles[i].right, bottom, paint);
}
}
if(mShape.compareToIgnoreCase("smpte") == 0)
{
top = mGradientRect.top + mFrameCounter;
bottom = mGradientRect.bottom + mFrameCounter;
if(bottom > mRectFrame.bottom)
{
mGradient.setBounds(mGradientRect.left, top - mRectFrame.bottom, mGradientRect.right, bottom - mRectFrame.bottom);
mGradient.draw(c);
}
if(top < mRectFrame.bottom)
{
mGradient.setBounds(mGradientRect.left, top, mGradientRect.right, bottom);
mGradient.draw(c);
}
}
}
}
else
{
for (int i = 0; i < mRectCount; i++)
{
paint.setColor(rectColor[i]);
c.drawRect(mColorRectangles[i], paint);
}
if(mShape.compareToIgnoreCase("smpte") == 0)
{
mGradient.setBounds(mGradientRect);
mGradient.draw(c);
}
}
c.restore();
}
void drawTouchPoint(Canvas c)
{
if (mTouchX >= 0 && mTouchY >= 0)
{
c.drawCircle(mTouchX, mTouchY, 80, mPaint);
}
}
void initFrameParams()
{
DisplayMetrics metrics = new DisplayMetrics();
Display display = ((WindowManager) getSystemService(WINDOW_SERVICE)).getDefaultDisplay();
display.getMetrics(metrics);
mRectFrame = new Rect(0, 0, metrics.widthPixels, metrics.heightPixels);
int rotation = display.getOrientation();
if(rotation == Surface.ROTATION_0 || rotation == Surface.ROTATION_180)
mHorizontal = false;
else
mHorizontal = true;
System.out.println("mHorizontal "+mHorizontal);
System.out.println("mShape "+mShape);
if(mShape.compareToIgnoreCase("smpte") == 0)
{
System.out.println("mShape == smpte");
CreateSmpte();
}
else if(mShape.compareToIgnoreCase("bars") == 0)
{
System.out.println("mShape == bars");
CreateBars();
}
else
{
System.out.println("mShape == ebu");
CreateEbu();
}
}
private void CreateSmpte()
{
if(mHorizontal)
{
int topHeight = mRectFrame.bottom * 7 / 12;
int bottomHeight = mRectFrame.bottom * 3 / 4;
int wideColumnWidth = mRectFrame.right / 8;
int narrowColumnWidth = mRectFrame.right * 3 / 28;
mColorRectangles[0] = new Rect(0, 0, wideColumnWidth, topHeight);
for (int i = 1; i < 8; i++)
{
mColorRectangles[i] = new Rect(mColorRectangles[i - 1].right, 0, mColorRectangles[i - 1].right + narrowColumnWidth, topHeight);
}
mColorRectangles[8] = new Rect(mColorRectangles[7].right, 0, mRectFrame.right, topHeight);
for (int i = 0; i < 2; i++)
{
int middleTop = mRectFrame.bottom * (7 + i) / 12;
int middleBottom = mRectFrame.bottom * (8 + i) / 12;
mColorRectangles[i + 9] = new Rect(0, middleTop, wideColumnWidth, middleBottom);
mColorRectangles[i + 11] = new Rect(wideColumnWidth, middleTop, narrowColumnWidth + wideColumnWidth, middleBottom);
mColorRectangles[i + 13] = new Rect(narrowColumnWidth * 7 + wideColumnWidth, middleTop, mRectFrame.right, middleBottom);
}
mColorRectangles[15] = new Rect(narrowColumnWidth + wideColumnWidth, topHeight, narrowColumnWidth * 7 + wideColumnWidth, mRectFrame.bottom * 8 / 12);
mGradientRect = new Rect(mColorRectangles[15].left, mColorRectangles[15].bottom, mColorRectangles[15].right, mRectFrame.bottom * 9 / 12);
mGradient = new GradientDrawable(Orientation.LEFT_RIGHT, new int[] { 0xff050505, 0xfffdfdfd });
mGradient.setBounds(mGradientRect);
mColorRectangles[16] = new Rect(0, bottomHeight, wideColumnWidth, mRectFrame.right);
mColorRectangles[17] = new Rect(mColorRectangles[16].right, bottomHeight, mRectFrame.right * 9 / 56 + mColorRectangles[16].right, mRectFrame.bottom);
mColorRectangles[18] = new Rect(mColorRectangles[17].right, bottomHeight, mRectFrame.right * 3 / 14 + mColorRectangles[17].right, mRectFrame.bottom);
mColorRectangles[19] = new Rect(mColorRectangles[18].right, bottomHeight, mRectFrame.right * 45 / 448 + mColorRectangles[18].right, mRectFrame.bottom);
for (int i = 20; i < 25; i++)
{
mColorRectangles[i] = new Rect(mColorRectangles[i - 1].right, bottomHeight, mRectFrame.right * 15 / 448 + mColorRectangles[i - 1].right, mRectFrame.right);
}
mColorRectangles[25] = new Rect(mColorRectangles[24].right, bottomHeight, narrowColumnWidth + mColorRectangles[24].right, mRectFrame.bottom);
mColorRectangles[26] = new Rect(mColorRectangles[25].right, bottomHeight, mRectFrame.right, mRectFrame.bottom);
}
else
{
int topHeight = mRectFrame.right * 5 / 12;
int bottomHeight = mRectFrame.right / 4;
int wideColumnWidth = mRectFrame.bottom / 8;
int narrowColumnWidth = mRectFrame.bottom * 3 / 28;
mColorRectangles[0] = new Rect(topHeight, 0, mRectFrame.bottom, wideColumnWidth);
for (int i = 1; i < 8; i++)
{
mColorRectangles[i] = new Rect(topHeight, mColorRectangles[i - 1].bottom, mRectFrame.right, narrowColumnWidth + mColorRectangles[i - 1].bottom);
}
mColorRectangles[8] = new Rect(topHeight, mColorRectangles[7].bottom, mRectFrame.right, mRectFrame.bottom);
for (int i = 0; i < 2; i++)
{
int middleLeft = mRectFrame.right * (4 - i) / 12;
int middleRight = mRectFrame.right * (5 - i) / 12;
mColorRectangles[i + 9] = new Rect(middleLeft, 0, middleRight, wideColumnWidth);
mColorRectangles[i + 11] = new Rect(middleLeft, wideColumnWidth, middleRight, narrowColumnWidth + wideColumnWidth);
mColorRectangles[i + 13] = new Rect(middleLeft, narrowColumnWidth * 7 + wideColumnWidth, middleRight, mRectFrame.bottom);
}
mColorRectangles[15] = new Rect(mRectFrame.right * 4 / 12, narrowColumnWidth + wideColumnWidth, mRectFrame.right * 5 / 12, narrowColumnWidth * 7 + wideColumnWidth);
mGradientRect = new Rect(mRectFrame.right * 3 / 12, mColorRectangles[15].top, mColorRectangles[15].left, mColorRectangles[15].bottom);
mGradient = new GradientDrawable(Orientation.TOP_BOTTOM, new int[] { 0xff050505, 0xfffdfdfd });
mGradient.setBounds(mGradientRect);
mColorRectangles[16] = new Rect(0, 0, bottomHeight, wideColumnWidth);
mColorRectangles[17] = new Rect(0, mColorRectangles[16].bottom, bottomHeight, mRectFrame.bottom * 9 / 56 + mColorRectangles[16].bottom);
mColorRectangles[18] = new Rect(0, mColorRectangles[17].bottom, bottomHeight, mRectFrame.bottom * 3 / 14 + mColorRectangles[17].bottom);
mColorRectangles[19] = new Rect(0, mColorRectangles[18].bottom, bottomHeight, mRectFrame.bottom * 45 / 448 + mColorRectangles[18].bottom);
for (int i = 20; i < 25; i++)
{
mColorRectangles[i] = new Rect(0, mColorRectangles[i - 1].bottom, bottomHeight, mRectFrame.bottom * 15 / 448 + mColorRectangles[i - 1].bottom);
}
mColorRectangles[25] = new Rect(0, mColorRectangles[24].bottom, bottomHeight, narrowColumnWidth + mColorRectangles[24].bottom);
mColorRectangles[26] = new Rect(0, mColorRectangles[25].bottom, bottomHeight, mRectFrame.bottom);
}
}
private void CreateBars()
{
if(mHorizontal)
{
int narrowColumnWidth = mRectFrame.right / 7;
int wideColumnWidth = mRectFrame.right * 5 / 28;
int narrowestColumnWidth = mRectFrame.right / 21;
int topColumnHeight = mRectFrame.bottom *2/3;
int middleColumnHeight = mRectFrame.bottom /12;
mColorRectangles[0] = new Rect(0, 0, narrowColumnWidth, topColumnHeight);
for (int i = 1; i < 7; i++)
{
mColorRectangles[i] = new Rect(mColorRectangles[i - 1].right, 0, mColorRectangles[i - 1].right + narrowColumnWidth, topColumnHeight);
}
mColorRectangles[7] = new Rect(0, mColorRectangles[0].bottom, narrowColumnWidth, mColorRectangles[0].bottom + middleColumnHeight);
for (int i = 8; i < 14; i++)
{
mColorRectangles[i] = new Rect(mColorRectangles[i - 1].right, mColorRectangles[7].top, mColorRectangles[i - 1].right + narrowColumnWidth, mColorRectangles[7].bottom);
}
mColorRectangles[14] = new Rect(0, mColorRectangles[7].bottom, wideColumnWidth, mRectFrame.bottom);
for (int i = 15; i < 18; i++)
{
mColorRectangles[i] = new Rect(mColorRectangles[i - 1].right, mColorRectangles[14].top, mColorRectangles[i - 1].right + wideColumnWidth, mRectFrame.bottom);
}
mColorRectangles[18] = new Rect(mColorRectangles[17].right, mColorRectangles[17].top, mColorRectangles[17].right + narrowestColumnWidth, mRectFrame.bottom);
for (int i = 19; i < 21; i++)
{
mColorRectangles[i] = new Rect(mColorRectangles[i - 1].right, mColorRectangles[14].top, mColorRectangles[i - 1].right + narrowestColumnWidth, mRectFrame.bottom);
}
mColorRectangles[21] = new Rect(mColorRectangles[20].right, mColorRectangles[17].top, mColorRectangles[6].right, mRectFrame.bottom);
}
else
{
int narrowColumnWidth = mRectFrame.bottom / 7;
int wideColumnWidth = mRectFrame.bottom * 5 / 28;
int narrowestColumnWidth = mRectFrame.bottom / 21;
int topColumnHeight = mRectFrame.right /3;
int middleColumnHeight = mRectFrame.right /12;
mColorRectangles[0] = new Rect(topColumnHeight, 0, mRectFrame.right, narrowColumnWidth);
for (int i = 1; i < 7; i++)
{
mColorRectangles[i] = new Rect(topColumnHeight, mColorRectangles[i - 1].bottom, mRectFrame.right, mColorRectangles[i - 1].bottom + narrowColumnWidth);
}
mColorRectangles[7] = new Rect(mColorRectangles[0].left + middleColumnHeight, 0, mColorRectangles[0].left, narrowColumnWidth);
for (int i = 8; i < 14; i++)
{
mColorRectangles[i] = new Rect(mColorRectangles[7].left, mColorRectangles[i - 1].bottom, mColorRectangles[7].right, mColorRectangles[i - 1].bottom + narrowColumnWidth);
}
mColorRectangles[14] = new Rect(0, 0, mColorRectangles[7].right, wideColumnWidth);
for (int i = 15; i < 18; i++)
{
mColorRectangles[i] = new Rect(0, mColorRectangles[i - 1].bottom, mColorRectangles[7].right, mColorRectangles[i - 1].bottom + wideColumnWidth);
}
mColorRectangles[18] = new Rect(0, mColorRectangles[17].bottom, mColorRectangles[7].right, mColorRectangles[17].bottom + narrowestColumnWidth);
for (int i = 19; i < 21; i++)
{
mColorRectangles[i] = new Rect(0, mColorRectangles[i - 1].bottom, mColorRectangles[7].right, mColorRectangles[i - 1].bottom + narrowestColumnWidth);
}
mColorRectangles[21] = new Rect(0, mColorRectangles[20].bottom, mColorRectangles[7].right, mRectFrame.bottom);
}
}
private void CreateEbu()
{
if(mHorizontal)
{
int narrowColumnWidth = mRectFrame.right / 8;
mColorRectangles[0] = new Rect(0, 0, narrowColumnWidth, mRectFrame.bottom);
for (int i = 1; i < 8; i++)
{
mColorRectangles[i] = new Rect(mColorRectangles[i - 1].right, 0, mColorRectangles[i - 1].right + narrowColumnWidth, mRectFrame.bottom);
}
}
else
{
int narrowColumnWidth = mRectFrame.bottom / 8;
mColorRectangles[0] = new Rect(0, 0, mRectFrame.right, narrowColumnWidth);
for (int i = 1; i < 8; i++)
{
mColorRectangles[i] = new Rect(0, mColorRectangles[i - 1].bottom, mRectFrame.right, narrowColumnWidth + mColorRectangles[i - 1].bottom);
}
}
}
}
}
这里需要注意的是在androidmanifest.xml文件中加入，大家可要记住哦，可不能这个给忘了，要不上面的代码就全白费了。
<service android:name=".LiveWallpaper" android:label="@string/app_name" android:icon="@drawable/icon">
<intent-filter>
<action android:name="android.service.wallpaper.WallpaperService" />
</intent-filter>
<meta-data android:name="android.service.wallpaper" android:resource="@xml/livewallpaper" />
</service>
