Android快捷方式，访问启动器db

Question

我想从启动器db获取数据。

final String AUTHORITY = "com.android.launcher2.settings";  
final Uri CONTENT_URI = Uri.parse("content://" + 
                        AUTHORITY + "/favorites?notify=true");
Cursor c = contentResolver.query(uri, columns, null, null,
            null);

和

<uses-permission 
        android:name="com.android.launcher.permission.INSTALL_SHORTCUT"/>
<uses-permission 
        android:name="com.android.launcher.permission.UNINSTALL_SHORTCUT"/>
<uses-permission 
        android:name="com.android.launcher.permission.READ_SETTINGS" />
<uses-permission 
        android:name="com.android.launcher.permission.WRITE_SETTINGS" />

但是在logcat中说:

Failed to find provider info for com.android.launcher2.settings

Answer 1

启动器是手机制造商负责的应用程序。权威并不总是"com.android.launcher2.settings"。手机制造商可以重写自己的。它可以是"com.android.twlauncher"，也可以是其他任何东西，这取决于Java包。

您需要通过搜索声明读写权限的提供程序"com.android.launcher.permission.READ_SETTINGS"或"com.android.launcher.permission.WRITE_SETTINGS"来检索正确的权限。

下面是一个示例代码:

static String getAuthorityFromPermission(Context context, String permission){
    if (permission == null) return null;
    List<PackageInfo> packs = context.getPackageManager().getInstalledPackages(PackageManager.GET_PROVIDERS);
    if (packs != null) {
        for (PackageInfo pack : packs) { 
            ProviderInfo[] providers = pack.providers; 
            if (providers != null) { 
                for (ProviderInfo provider : providers) { 
                    if (permission.equals(provider.readPermission)) return provider.authority;
                    if (permission.equals(provider.writePermission)) return provider.authority;
                } 
            }
        }
    }
    return null;
}

一般来说，ContentProvider和DB结构被保留，你可以使用相同的查询

Answer 2

对于我的Nexus 5设备需要不同的权限

<uses-permission android:name="com.google.android.launcher.permission.READ_SETTINGS"/>
<uses-permission android:name="com.google.android.launcher.permission.WRITE_SETTINGS"/>

权限字符串为com.google.android.launcher.settings