GooglePhoto设置壁纸----壁纸裁剪界面配置

背景描述：

Google photo打开一张图片，点击设为、弹出提示框里选择photo，提示“发生错误，无法加载媒体”。

error,could not load media

问题分析

1、对比机同样操作，可以打开壁纸应用设置壁纸

2、其它对比机，打开Google photo自己的编辑图片界面，点击可以正常设置壁纸。

Log分析

 Google相册里点击设为：
START u0 \{act=android.intent.action.CHOOSER flg=0x1 cmp=android/com.android.internal.app.ChooserActivity clip=\{image/jpeg \{...}} (has extras)} from uid 10211

弹出选择框后点击相册：
START u0 \{act=android.intent.action.ATTACH_DATA dat=content://com.google.android.apps.photos.contentprovider/-1/1/content://media/external/images/media/50/ORIGINAL/JPG/image/jpeg/380847275 typ=image/jpeg flg=0x3000001 cmp=com.google.android.apps.photos/.setwallpaper.SetWallpaperActivity (has extras)} from uid 10211

START u0 \{act=android.service.wallpaper.CROP_AND_SET_WALLPAPER dat=content://com.google.android.apps.photos.contentprovider/-1/1/content://media/external/images/media/50/ORIGINAL/JPG/image/jpeg/380847275 flg=0x1 pkg=com.google.android.apps.wallpaper cmp=com.google.android.apps.wallpaper/com.android.wallpaper.picker.StandalonePreviewActivity} from uid 10211

ActivityManager: Start proc 3437:com.google.android.apps.wallpaper/u0a241 for pre-top-activity \{com.google.android.apps.wallpaper/com.android.wallpaper.picker.StandalonePreviewActivity} 

        以上为Google pixel机器的log，如log显示，最终打开了com.google.android.apps.wallpaper Google自己的壁纸应用。

1、选择器界面为系统界面：android/com.android.internal.app.ChooserActivity

2、选择相册之后，可以看到一个action，裁剪并且设置壁纸 android.service.wallpaper.CROP_AND_SET_WALLPAPER可以看出是根据action和包类名去启动的界面

3.1、熟悉原生壁纸代码的话，可以很快意识到这个action是用来启动壁纸裁剪界面的

<activity android:name="com.android.wallpaper.picker.StandalonePreviewActivity"
        android:resizeableActivity="false"
        android:theme="@style/WallpaperTheme.Preview">
      <intent-filter>
        <action android:name="android.service.wallpaper.CROP_AND_SET_WALLPAPER" />
        <category android:name="android.intent.category.DEFAULT" />
        <data android:mimeType="image/*" />
      </intent-filter>
</activity>

3.2、设置壁纸的action

    <activity android:name="com.android.wallpaper.picker.TopLevelPickerActivity"
        android:label="@string/app_name"
        android:theme="@style/WallpaperTheme.NoBackground"
        android:resizeableActivity="false">
      <intent-filter>
        <action android:name="android.intent.action.SET_WALLPAPER"/>
        <category android:name="android.intent.category.DEFAULT"/>
      </intent-filter>
    </activity>

3.3、附加数据的action

Used to indicate that some piece of data should be attached to some other place. For example, image data could be attached to a contact. It is up to the recipient to decide where the data should be attached; the intent does not specify the ultimate destination.
Input: getData is URI of data to be attached.
Output: nothing
@SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
public static final String ACTION_ATTACH_DATA = "android.intent.action.ATTACH_DATA";

4、framework/base下面搜索CROP_AND_SET_WALLPAPER找到相关逻辑代码

frameworks/base/core/java/android/app/WallpaperManager.java

    /**
     * Gets an Intent that will launch an activity that crops the given
     * image and sets the device's wallpaper. If there is a default HOME activity
     * that supports cropping wallpapers, it will be preferred as the default.
     * Use this method instead of directly creating a {@link #ACTION_CROP_AND_SET_WALLPAPER}
     * intent.
     *
     * @param imageUri The image URI that will be set in the intent. The must be a content
     *                 URI and its provider must resolve its type to "image/*"
     *
     * @throws IllegalArgumentException if the URI is not a content URI or its MIME type is
     *         not "image/*"
     */
    public Intent getCropAndSetWallpaperIntent(Uri imageUri) {
        if (imageUri == null) {
            throw new IllegalArgumentException("Image URI must not be null");
        }

        if (!ContentResolver.SCHEME_CONTENT.equals(imageUri.getScheme())) {
            throw new IllegalArgumentException("Image URI must be of the "
                    + ContentResolver.SCHEME_CONTENT + " scheme type");
        }

        final PackageManager packageManager = mContext.getPackageManager();
        Intent cropAndSetWallpaperIntent =
                new Intent(ACTION_CROP_AND_SET_WALLPAPER, imageUri);
        Log.d(TAG, "imageUri 111 : "+imageUri);
        cropAndSetWallpaperIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);

        // Find out if the default HOME activity supports CROP_AND_SET_WALLPAPER
        Intent homeIntent = new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_HOME);
        ResolveInfo resolvedHome = packageManager.resolveActivity(homeIntent,
                PackageManager.MATCH_DEFAULT_ONLY);
        if (resolvedHome != null) {
            cropAndSetWallpaperIntent.setPackage(resolvedHome.activityInfo.packageName);

            List<ResolveInfo> cropAppList = packageManager.queryIntentActivities(
                    cropAndSetWallpaperIntent, 0);
            if (cropAppList.size() > 0) {
                Log.w(TAG, "cropAndSetWallpaperIntent 111 : "+cropAndSetWallpaperIntent);
                return cropAndSetWallpaperIntent;
            }
        }

        // fallback crop activity
        final String cropperPackage = mContext.getString(
                com.android.internal.R.string.config_wallpaperCropperPackage);
        cropAndSetWallpaperIntent.setPackage(cropperPackage);
        List<ResolveInfo> cropAppList = packageManager.queryIntentActivities(
                cropAndSetWallpaperIntent, 0);
        if (cropAppList.size() > 0) {
            Log.w(TAG, "cropAndSetWallpaperIntent 222 : "+cropAndSetWallpaperIntent);
            return cropAndSetWallpaperIntent;
        }
        // If the URI is not of the right type, or for some reason the system wallpaper
        // cropper doesn't exist, return null
        throw new IllegalArgumentException("Cannot use passed URI to set wallpaper; " +
            "check that the type returned by ContentProvider matches image/*");
    }

原生的逻辑还是比较清晰的，

        1、先看看homeIntent能否匹配到这个action（也就是看看launcher是否注册了这个action）

        2、然后判断默认配置config_wallpaperCropperPackage的包名对应的应用是否有注册这个action（我们希望它走这里正常打开我们自己的壁纸界面，配置自己的壁纸应用包名即可）

        3、如果都没有，最后Google photo会打开自己的壁纸编辑界面

5、配置路径和其它壁纸相关的配置

frameworks/base/core/res/res/values/config.xml

<!-- Component name of the built in wallpaper used to display bitmap wallpapers. This must not be null. -->
<string name="image_wallpaper_component" translatable="false">com.android.systemui/com.android.systemui.ImageWallpaper</string>

    <!-- Class name of WallpaperManagerService. -->
    <string name="config_wallpaperManagerServiceName" translatable="false">com.android.server.wallpaper.WallpaperManagerService</string>

    <!-- If AOD can show an ambient version of the wallpaper -->
    <bool name="config_dozeSupportsAodWallpaper">true</bool>

    <!-- Wallpaper cropper package. Used as the default cropper if the active launcher doesn't
         handle wallpaper cropping.
    -->
    <string name="config_wallpaperCropperPackage" translatable="false">com.android.wallpaperpicker</string>

    <!-- The max scale for the wallpaper when it's zoomed in -->
    <item name="config_wallpaperMaxScale" format="float" type="dimen">1.10</item>

6、如果是mtk平台，会有覆盖路径

device/mediatek/common/overlay/wallpaper/frameworks/base/core/res/res/values/config.xml

device/mediatek/system/common/overlay/wallpaper/frameworks/base/core/res/res/values/config.xml