深入理解Android卷 III 的SampleWindow

package understanding.wms.samplewindow; import android.content.Context; import android.content.res.Configuration; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Point; import android.graphics.Rect; import android.os.Binder; import android.os.IBinder; import android.os.Looper; import android.view.Gravity; import android.view.MotionEvent; import android.view.Surface; import android.view.View; import android.view.WindowManager; import android.view.WindowManager.LayoutParams; import android.view.InputChannel; import android.view.IWindowSession; import android.view.IWindow; import android.view.Choreographer; import android.view.InputEventReceiver; import android.view.IWindowManager; import android.view.InputEvent; import android.view.DisplayInfo; import android.os.ServiceManager; import android.view.WindowManagerGlobal; import android.hardware.display.IDisplayManager; import android.view.Display; import android.util.Log; import android.os.ParcelFileDescriptor; import android.os.Bundle; import android.view.DragEvent; public class SampleWindow { private static final String TAG = "SampleWindow"; public static void main(String[] args) { try { new SampleWindow().Run(); } catch (Exception e) { e.printStackTrace(); } } IWindowSession mSession = null; InputChannel mInputChannel = new InputChannel(); Rect mInsets = new Rect(); Rect mFrame = new Rect(); Rect mVisibleInsets = new Rect(); Configuration mConfig = new Configuration(); Surface mSurface = new Surface(); Paint mPaint = new Paint(); IBinder mToken = new Binder(); MyWindow mWindow = new MyWindow(); LayoutParams mLp = new LayoutParams(); Choreographer mChoreographer = null; InputHandler mInputHandler = null; boolean mContinueAnime = true; public void Run() throws Exception { Looper.prepare(); IWindowManager wms = IWindowManager.Stub.asInterface ( ServiceManager.getService(Context.WINDOW_SERVICE)); mSession = WindowManagerGlobal.getWindowSession(Looper.myLooper()); IDisplayManager dm = IDisplayManager.Stub.asInterface( ServiceManager.getService(Context.DISPLAY_SERVICE)); DisplayInfo di = dm.getDisplayInfo(Display.DEFAULT_DISPLAY); Point scrnSize = new Point(di.appWidth, di.appHeight); initLayoutParams(scrnSize); installWindow(wms); mChoreographer = Choreographer.getInstance(); scheduleNextFrame(); Looper.loop(); mContinueAnime = false; uninstallWindow(wms); } public void initLayoutParams(Point screenSize) { mLp.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT; mLp.setTitle("Sample * Window"); mLp.gravity = Gravity.LEFT | Gravity.TOP; mLp.x = screenSize.x / 4; mLp.y = screenSize.y / 4; mLp.width = screenSize.x / 2; mLp.height = screenSize.y / 2; mLp.flags = mLp.flags | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL; } public void installWindow(IWindowManager wms) throws Exception { wms.addWindowToken(mToken, WindowManager.LayoutParams.TYPE_SYSTEM_ALERT); mLp.token = mToken; mSession.add(mWindow, 0, mLp, View.VISIBLE, mInsets, mInputChannel); mSession.relayout(mWindow, 0, mLp, mLp.width, mLp.height, View.VISIBLE, 0, mFrame, mInsets, mVisibleInsets, mConfig, mSurface); if(!mSurface.isValid()) { throw new RuntimeException("Failed creating Surface"); } mInputHandler = new InputHandler(mInputChannel, Looper.myLooper()); } public void uninstallWindow(IWindowManager wms) throws Exception { mSession.remove(mWindow); wms.removeWindowToken(mToken); } public void scheduleNextFrame() { mChoreographer.postCallback(Choreographer.CALLBACK_ANIMATION, mFrameRender, null); } public Runnable mFrameRender = new Runnable(){ public void run() { try { long time = mChoreographer.getFrameTime() % 1000; if(mSurface.isValid()){ Canvas canvas = mSurface.lockCanvas(null); canvas.drawColor(Color.DKGRAY); canvas.drawRect(2 * mLp.width * time / 1000 - mLp.width, 0, 2 * mLp.width * time /1000, mLp.height, mPaint); mSurface.unlockCanvasAndPost(canvas); mSession.finishDrawing(mWindow); } if(mContinueAnime){ scheduleNextFrame(); } } catch (Exception e){ e.printStackTrace(); } }; }; class InputHandler extends InputEventReceiver { Looper mLooper = null; public InputHandler (InputChannel inputChannel, Looper looper) { super(inputChannel, looper); mLooper = looper; } @Override public void onInputEvent(InputEvent event) { if(event instanceof MotionEvent){ MotionEvent me = (MotionEvent)event; if(me.getAction() == MotionEvent.ACTION_UP){ mLooper.quit(); } } super.onInputEvent(event); } } class MyWindow extends IWindow.Stub { private static final String TAG = "MyWindow"; public void resized(Rect frame, Rect contentInsets, Rect visibleInsets, boolean reportDraw, Configuration newConfig) { Log.i(TAG, "resized"); } @Override public void moved(int newX, int newY) { Log.i(TAG, "moved"); } public void dispatchAppVisibility(boolean visible) { Log.i(TAG, "dispatchAppVisibility"); } public void dispatchScreenState(boolean on) { Log.i(TAG, "dispatchScreenState"); } public void dispatchGetNewSurface() { Log.i(TAG, "dispatchGetNewSurface"); } public void windowFocusChanged(boolean hasFocus, boolean inTouchMode) { Log.i(TAG, "windowFocusChanged: hasFocus = " + hasFocus); } public void executeCommand(String command, String parameters, ParcelFileDescriptor out) { Log.i(TAG, "executeCommand"); } public void closeSystemDialogs(String reason) { Log.i(TAG, "closeSystemDialogs:" + reason); } public void dispatchWallpaperOffsets(float x, float y, float xStep, float yStep, boolean sync) { Log.i(TAG, "dispatchWallpaperOffsets"); } public void dispatchWallpaperCommand(String action, int x, int y, int z, Bundle extras, boolean sync) { Log.i(TAG, "dispatchWallpaperCommand"); } /* Drag/drop */ public void dispatchDragEvent(DragEvent event) { Log.i(TAG, "dispatchDragEvent"); } public void dispatchSystemUiVisibilityChanged(int seq, int globalVisibility, int localValue, int localChanges) { Log.i(TAG, "dispatchSystemUiVisibilityChanged"); } public void doneAnimating() { Log.i(TAG, "doneAnimating"); } } }