Android系统截屏功能提取Demo

package com.fichardu.viewshot; /* * Copyright (C) 2011 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import android.animation.Animator; import android.animation.AnimatorListenerAdapter; import android.animation.AnimatorSet; import android.animation.ValueAnimator; import android.animation.ValueAnimator.AnimatorUpdateListener; import android.content.Context; import android.content.res.Resources; import android.graphics.Bitmap; import android.graphics.Matrix; import android.graphics.PixelFormat; import android.graphics.PointF; import android.media.MediaActionSound; import android.net.Uri; import android.util.DisplayMetrics; import android.view.Display; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.view.WindowManager; import android.view.animation.Interpolator; import android.widget.ImageView; /** * POD used in the AsyncTask which saves an image in the background. */ class SaveImageInBackgroundData { Context context; Bitmap image; Uri imageUri; Runnable finisher; int iconSize; int result; void clearImage() { image = null; imageUri = null; iconSize = 0; } void clearContext() { context = null; } } /** * TODO: * - Performance when over gl surfaces? Ie. Gallery * - what do we say in the Toast? Which icon do we get if the user uses another * type of gallery? */ class GlobalScreenshot { private static final String TAG = "GlobalScreenshot"; private static final int SCREENSHOT_FLASH_TO_PEAK_DURATION = 130; private static final int SCREENSHOT_DROP_IN_DURATION = 430; private static final int SCREENSHOT_DROP_OUT_DELAY = 500; private static final int SCREENSHOT_DROP_OUT_DURATION = 430; private static final int SCREENSHOT_DROP_OUT_SCALE_DURATION = 370; private static final int SCREENSHOT_FAST_DROP_OUT_DURATION = 320; private static final float BACKGROUND_ALPHA = 0.5f; private static final float SCREENSHOT_SCALE = 1f; private static final float SCREENSHOT_DROP_IN_MIN_SCALE = SCREENSHOT_SCALE * 0.725f; private static final float SCREENSHOT_DROP_OUT_MIN_SCALE = SCREENSHOT_SCALE * 0.45f; private static final float SCREENSHOT_FAST_DROP_OUT_MIN_SCALE = SCREENSHOT_SCALE * 0.6f; private static final float SCREENSHOT_DROP_OUT_MIN_SCALE_OFFSET = 0f; private Context mContext; private WindowManager mWindowManager; private WindowManager.LayoutParams mWindowLayoutParams; private Display mDisplay; private DisplayMetrics mDisplayMetrics; private Bitmap mScreenBitmap; private View mScreenshotLayout; private ImageView mBackgroundView; private ImageView mScreenshotView; private ImageView mScreenshotFlash; private AnimatorSet mScreenshotAnimation; private float mBgPadding; private float mBgPaddingScale; private MediaActionSound mCameraSound; /** * @param context everything needs a context :( */ public GlobalScreenshot(Context context) { Resources r = context.getResources(); mContext = context; LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); // Inflate the screenshot layout mScreenshotLayout = layoutInflater.inflate(R.layout.global_screenshot, null); mBackgroundView = (ImageView) mScreenshotLayout.findViewById(R.id.global_screenshot_background); mScreenshotView = (ImageView) mScreenshotLayout.findViewById(R.id.global_screenshot); mScreenshotFlash = (ImageView) mScreenshotLayout.findViewById(R.id.global_screenshot_flash); mScreenshotLayout.setFocusable(true); mScreenshotLayout.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { // Intercept and ignore all touch events return true; } }); // Setup the window that we are going to use mWindowLayoutParams = new WindowManager.LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT, 0, 0, WindowManager.LayoutParams.TYPE_SYSTEM_ALERT, WindowManager.LayoutParams.FLAG_FULLSCREEN | WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED, PixelFormat.TRANSLUCENT); mWindowLayoutParams.setTitle("ScreenshotAnimation"); mWindowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE); mDisplay = mWindowManager.getDefaultDisplay(); mDisplayMetrics = new DisplayMetrics(); mDisplay.getRealMetrics(mDisplayMetrics); // Scale has to account for both sides of the bg mBgPadding = (float) r.getDimensionPixelSize(R.dimen.global_screenshot_bg_padding); mBgPaddingScale = mBgPadding / mDisplayMetrics.widthPixels; // Setup the Camera shutter sound mCameraSound = new MediaActionSound(); mCameraSound.load(MediaActionSound.SHUTTER_CLICK); } /** * Takes a screenshot of the current display and shows an animation. */ void takeScreenshot(View view, Runnable finisher, boolean statusBarVisible, boolean navBarVisible) { // Take the screenshot mScreenBitmap = SurfaceControl.screenshot(view); if (mScreenBitmap == null) { notifyScreenshotError(mContext); finisher.run(); return; } // Optimizations mScreenBitmap.setHasAlpha(false); mScreenBitmap.prepareToDraw(); // Start the post-screenshot animation startAnimation(finisher, mDisplayMetrics.widthPixels, mDisplayMetrics.heightPixels, statusBarVisible, navBarVisible); } /** * Starts the animation after taking the screenshot */ private void startAnimation(final Runnable finisher, int w, int h, boolean statusBarVisible, boolean navBarVisible) { // Add the view for the animation mScreenshotView.setImageBitmap(mScreenBitmap); mScreenshotLayout.requestFocus(); // Setup the animation with the screenshot just taken if (mScreenshotAnimation != null) { mScreenshotAnimation.end(); mScreenshotAnimation.removeAllListeners(); } mWindowManager.addView(mScreenshotLayout, mWindowLayoutParams); ValueAnimator screenshotDropInAnim = createScreenshotDropInAnimation(); ValueAnimator screenshotFadeOutAnim = createScreenshotDropOutAnimation(w, h, statusBarVisible, navBarVisible); mScreenshotAnimation = new AnimatorSet(); mScreenshotAnimation.playSequentially(screenshotDropInAnim, screenshotFadeOutAnim); mScreenshotAnimation.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { // Save the screenshot once we have a b