Android客制化------7.0设置壁纸存在的一些问题

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最近在开7.0的坑，遇到了一些小问题，记录一下。很大可能这个问题只是我这个芯片的代码上才存在的，不过殊途同归啦。
第一个问题就是，我们增加内置可选壁纸，选择这些壁纸后进行设置，会发现拉伸很明显。通过增加打印log发现

 diff --git a/src/com/android/wallpaperpicker/WallpaperCropActivity.java b/src/com/android/wallpaperpicker/WallpaperCropActivity.javaold mode 100644new mode 100755index bdb601b..67d1551--- a/src/com/android/wallpaperpicker/WallpaperCropActivity.java+++ b/src/com/android/wallpaperpicker/WallpaperCropActivity.java@@ -337,15 +337,22 @@ public class WallpaperCropActivity extends Activity implements Handler.Callback         Point inSize = mCropView.getSourceDimensions();         Point outSize = WallpaperUtils.getDefaultWallpaperSize(getResources(),                 getWindowManager());+               android.util.Log.d(LOGTAG,"inSize.x = " + inSize.x + " inSize.y = " + inSize.y+                       + " outSize.x = " + outSize.x + " outSize.y = " + outSize.y);         RectF crop = Utils.getMaxCropRect(                 inSize.x, inSize.y, outSize.x, outSize.y, false);         // Passing 0, 0 will cause launcher to revert to using the         // default wallpaper size         CropAndFinishHandler onEndCrop = new CropAndFinishHandler(new Point(0, 0),                 shouldFadeOutOnFinish);         CropAndSetWallpaperTask cropTask = new CropAndSetWallpaperTask(                 streamProvider, this, crop, streamProvider.getRotationFromExif(this),                 outSize.x, outSize.y, onEndCrop);         DialogUtils.executeCropTaskAfterPrompt(this, cropTask, getOnDialogCancelListener());     }

我们的壁纸尺寸是1024*600，log打印的inSize都是正确的，但是outSize却变成了1200*1024了，由此产生了壁纸设置后有拉伸的情况。
这里写图片描述

因此问题就是出在这个Size的变化上，我们继续跟踪源码，会发现

diff --git a/src/com/android/wallpaperpicker/WallpaperUtils.java b/src/com/android/wallpaperpicker/WallpaperUtils.javaold mode 100644new mode 100755index 1532190..a4d88d7--- a/src/com/android/wallpaperpicker/WallpaperUtils.java+++ b/src/com/android/wallpaperpicker/WallpaperUtils.java@@ -137,7 +137,7 @@ public final class WallpaperUtils {             // We need to ensure that there is enough extra space in the wallpaper             // for the intended parallax effects-            final int defaultWidth, defaultHeight;+            int defaultWidth, defaultHeight;             if (res.getConfiguration().smallestScreenWidthDp >= 720) {                 defaultWidth = (int) (maxDim * wallpaperTravelToScreenWidthRatio(maxDim, minDim));                 defaultHeight = maxDim;@@ -145,6 +145,11 @@ public final class WallpaperUtils {                 defaultWidth = Math.max((int) (minDim * WALLPAPER_SCREENS_SPAN), maxDim);                 defaultHeight = maxDim;             }+                       android.util.Log.d("WallpaperCropActivity"," res.getConfiguration().smallestScreenWidthDp = "+                       + res.getConfiguration().smallestScreenWidthDp + " defaultWidth = " + defaultWidth+                               + " minDim =" + minDim + " maxDim =" + maxDim);+            defaultWidth = maxDim;+            defaultHeight = minDim;             sDefaultWallpaperSize = new Point(defaultWidth, defaultHeight);         }         return sDefaultWallpaperSize;

问题的根源就是这个defaultWidth和defaultHeight啦。继续打印log发现maxDim和minDim就是我们正确的壁纸尺寸，这两个变量都是final的更改下修饰符，同时将最终设置的尺寸更改为正确的，辣么设置的壁纸的拉伸问题就暂时解决了。

第二个问题，就是设置sd卡中的图片作为壁纸，这个东西源码分析的过程比较复杂。可以通过dumpsys wallpaper以及dumpsys SurfaceFlinger来查看图片的设置尺寸。更改的地方涉及三处。分别是launcher3、framework/base/core以及SystemUI。

packages/apps/Launcher3diff --git a/src/com/android/launcher3/InvariantDeviceProfile.java b/src/com/android/launcher3/InvariantDeviceProfile.javaindex 38545e2..ecd3ad6 100644--- a/src/com/android/launcher3/InvariantDeviceProfile.java+++ b/src/com/android/launcher3/InvariantDeviceProfile.java@@ -177,7 +177,7 @@ public class InvariantDeviceProfile {                     (int) (largeSide * wallpaperTravelToScreenWidthRatio(largeSide, smallSide)),                     largeSide);         } else {-            defaultWallpaperSize = new Point(Math.max(smallSide * 2, largeSide), largeSide);+            defaultWallpaperSize = new Point(largeSide, largeSide);         }     }frameworks/base--- a/core/java/android/app/WallpaperManager.java+++ b/core/java/android/app/WallpaperManager.java@@ -55,6 +55,7 @@ import android.os.SystemProperties; import android.os.UserHandle; import android.text.TextUtils; import android.util.Log;+import android.view.WindowManager; import android.view.WindowManagerGlobal; import libcore.io.IoUtils;@@ -310,7 +311,7 @@ public class WallpaperManager {                 mCachedWallpaper = null;                 mCachedWallpaperUserId = 0;                 try {-                    mCachedWallpaper = getCurrentWallpaperLocked(userId);+                    mCachedWallpaper = getCurrentWallpaperLocked(context,userId);                     mCachedWallpaperUserId = userId;                 } catch (OutOfMemoryError e) {                     Log.w(TAG, "No memory load current wallpaper", e);@@ -342,7 +343,7 @@ public class WallpaperManager {           }         }-        private Bitmap getCurrentWallpaperLocked(int userId) {+        private Bitmap getCurrentWallpaperLocked(Context context,int userId) {             if (mService == null) {                 Log.w(TAG, "WallpaperService not running");                 return null;@@ -354,7 +355,15 @@ public class WallpaperManager {                         params, userId);                 if (fd != null) {                     try {+                       WindowManager mWindowManager = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);+                       int wW = mWindowManager.getDefaultDisplay().getWidth();+                       int wH = mWindowManager.getDefaultDisplay().getHeight();                         BitmapFactory.Options options = new BitmapFactory.Options();+                       options.inJustDecodeBounds = true;+                       BitmapFactory.decodeFileDescriptor(+                               fd.getFileDescriptor(), null, options);+                       options.inSampleSize = calculateInSampleSize(options, wW,wH);+                       options.inJustDecodeBounds = false;                         return BitmapFactory.decodeFileDescriptor(                                 fd.getFileDescriptor(), null, options);                     } catch (OutOfMemoryError e) {@@ -369,11 +378,30 @@ public class WallpaperManager {             return null;         }+        private int calculateInSampleSize(BitmapFactory.Options options,int reqWidth, int reqHeight){+                  int width = options.outWidth;+                  int height = options.outHeight;+                  int inSampleSize = 1;+                  if (width > reqWidth && height > reqHeight){+                int widthRatio = Math.round((float) width / (float) reqWidth);+                int heightRatio = Math.round((float) width / (float) reqWidth);+                inSampleSize = Math.max(widthRatio, heightRatio);+                  }+                  return inSampleSize;+        }+         private Bitmap getDefaultWallpaper(Context context, @SetWallpaperFlags int which) {+            WindowManager mWindowManager = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);+            int wW = mWindowManager.getDefaultDisplay().getWidth();+            int wH = mWindowManager.getDefaultDisplay().getHeight();             InputStream is = openDefaultWallpaper(context, which);             if (is != null) {                 try {                     BitmapFactory.Options options = new BitmapFactory.Options();+                    options.inJustDecodeBounds = true;+                    BitmapFactory.decodeStream(is, null, options);+                    options.inSampleSize = calculateInSampleSize(options, wW,wH);+                    options.inJustDecodeBounds = false;                     return BitmapFactory.decodeStream(is, null, options);                 } catch (OutOfMemoryError e) {                     Log.w(TAG, "Can't decode stream", e);diff --git a/packages/SystemUI/src/com/android/systemui/ImageWallpaper.java b/packages/SystemUI/src/com/android/systemui/ImageWallpaper.javaindex c88931d..fecc47e 100755--- a/packages/SystemUI/src/com/android/systemui/ImageWallpaper.java+++ b/packages/SystemUI/src/com/android/systemui/ImageWallpaper.java@@ -229,14 +229,15 @@ public class ImageWallpaper extends WallpaperService {                 surfaceHeight = Math.max(displayInfo.logicalHeight, mBackgroundHeight);             }-            if (FIXED_SIZED_SURFACE) {+           //Log.d(TAG,"----surfaceWidth = "+surfaceWidth+" surfaceHeight= "+surfaceHeight);+            /*if (FIXED_SIZED_SURFACE) {                 // Used a fixed size surface, because we are special.  We can do                 // this because we know the current design of window animations doesn't                 // cause this to break.                 surfaceHolder.setFixedSize(surfaceWidth, surfaceHeight);                 mLastRequestedWidth = surfaceWidth;                 mLastRequestedHeight = surfaceHeight;-            } else {+            } else*/ {                 surfaceHolder.setSizeFromLayout();             }             return hasWallpaper;

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