Live Wallpaper動态桌面開發

對于Android 2.1來說Live Wallpapers動态桌面的加入為Android桌面加入了更好的動态效果。如何開發一個Android動态桌面呢? 下面eoe給大家一個詳細的步驟建立屬于你自己的Live Wallpaper吧。

1. 首先我使用 Eclipse建立一個标準的 Android工程這裡 package name然後進入工程的 /res/檔案夾，删除layout這個檔案夾，當然裡面的 main.xml也會被删除的，對于 Live Wallpaper來說傳統的布局檔案是不需要的。

2. 類似 AppWidget一樣，我們可以加入 動态桌面的設定界面，我們在/ res/檔案夾中建立一個名為 xml的檔案夾，建立一個 utf8編碼的 xml檔案，名為 livewallpaper.xml，内容為

Java代碼：

<?xml version="1.0" encoding="utf-8"?>

<wallpaper xmlns:android="http://schemas.android.com/apk/res/android"

android:thumbnail="@drawable/icon"/>

這裡我們可以看到上面的節點名為wallpaper，而設定的界面為.而在添加動态桌面時顯示圖為/res/drawable/icon這個檔案，同時我們再建立一個xml檔案用于LiveWallpaperSettings這個Activity的布局，我們起名為livewallpaper_settings.xml内容為

Java代碼：

<?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="标題"

android:summary="簡單描述"

android:entries="@array/livewallpaper_testpattern_names"

android:entryValues="@array/livewallpaper_testpattern_prefix"/>

<CheckBoxPreference android:key="livewallpaper_movement"

android:summary="動态描述"

android:title="動态标題"

android:summaryOn="動态測試"

android:summaryOff="靜止測試"/>

</PreferenceScreen>

建立一個名為LiveWallpaper的類作為動态桌面的主類，從WallpaperService父類繼承，這裡我們可以像寫标準Android服務那樣開發，代碼為

Java代碼：

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);

}

}

}

}

}

這裡需要注意的是在androidmanifest.xml檔案中加入，大家可要記住哦，可不能這個給忘了，要不上面的代碼就全白費了。

<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>