摘要：通过广播设置全局参数控制应用是否允许卸载，全局参数在Launcher和PackageInstaller两个模块中使用到。此功能可用于MDM后台控制是否允许设备卸载应用。
1. 静态注册广播
由于系统安装和卸载的功能集中在PackageInstaller模块中，为了更好的调用并适配android标准接口，故将广播注册在PackageInstaller模块，同时添加写全局变量的权限。
Index: frameworks/base/packages/PackageInstaller/AndroidManifest.xml
===================================================================
--- frameworks/base/packages/PackageInstaller/AndroidManifest.xml (版本 360)
+++ frameworks/base/packages/PackageInstaller/AndroidManifest.xml (版本 361)
@@ -18,6 +18,7 @@
<uses-permission android:name="android.permission.PACKAGE_USAGE_STATS" />
<uses-permission android:name="android.permission.QUERY_ALL_PACKAGES" />
<uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+ <uses-permission android:name="android.permission.WRITE_SETTINGS" /> <!-- @ + -->
<uses-permission android:name="com.google.android.permission.INSTALL_WEARABLE_PACKAGES" />
@@ -142,6 +143,16 @@
android:authorities="com.google.android.packageinstaller.wear.provider"
android:grantUriPermissions="true"
android:exported="true" />
+
+ <!-- @ + { -->
+ <receiver android:name=".UninstallAppStatusAddReceiver"
+ android:exported="true" >
+ <intent-filter>
+ <action android:name="com.example.launcher.UNINSTALL"/>
+ </intent-filter>
+ </receiver>
+ <!-- @ + } -->
</application>
</manifest>
2. 收到广播后设置全局变量
接收到携带应用包名和卸载与否标志位的参数的广播后，将全局变量对应的包名设置为相对应的标志位。
Index: frameworks/base/packages/PackageInstaller/src/com/android/packageinstaller/UninstallAppStatusAddReceiver.java
===================================================================
--- frameworks/base/packages/PackageInstaller/src/com/android/packageinstaller/UninstallAppStatusAddReceiver.java (不存在的)
+++ frameworks/base/packages/PackageInstaller/src/com/android/packageinstaller/UninstallAppStatusAddReceiver.java (版本 361)
@@ -0,0 +1,57 @@
+package com.android.packageinstaller;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Environment;
+import android.provider.Settings;
+import android.text.TextUtils;
+import android.util.Log;
+
+
+public class UninstallAppStatusAddReceiver extends BroadcastReceiver {
+
+ private final static String ACTION_UNINSTALL = "com.example.launcher.UNINSTALL";
+
+ @Override
+ public void onReceive(Context context, Intent intent) {
+ String action = intent.getAction();
+ Log.d("UninstallAppStatusAddReceiver", "onReceive: " + action);
+ if (ACTION_UNINSTALL.equals(action)) {
+ String pkgName = intent.getStringExtra("packageName");
+ int flag = intent.getIntExtra("flag",0);
+ if (!(TextUtils.isEmpty(pkgName))) {
+ Settings.System.putInt(context.getContentResolver(),pkgName, flag);
+ }
+ }
+ }
+}
3. 卸载时不做处理
在设置-应用中卸载
Index: frameworks/base/packages/PackageInstaller/src/com/android/packageinstaller/UninstallerActivity.java
===================================================================
--- frameworks/base/packages/PackageInstaller/src/com/android/packageinstaller/UninstallerActivity.java (版本 360)
+++ frameworks/base/packages/PackageInstaller/src/com/android/packageinstaller/UninstallerActivity.java (版本 361)
@@ -55,6 +55,7 @@
import android.os.ServiceManager;
import android.os.UserHandle;
import android.os.UserManager;
+import android.provider.Settings;
import android.util.Log;
import com.android.packageinstaller.handheld.ErrorDialogFragment;
@@ -210,7 +211,15 @@
}
}
- showConfirmationDialog();
+ // @ + {
+ int flag = Settings.System.getInt(getContentResolver(), mPackageName, 0);
+ if (flag == 0) {
+ showConfirmationDialog();
+ }
+ if (flag == 1) {
+ finish();
+ }
+ // @ + }
}
public DialogInfo getDialogInfo() {
在Launcher拖动不显示卸载
Index: vendor/mediatek/proprietary/packages/apps/Launcher3/src/com/android/launcher3/ButtonDropTarget.java
===================================================================
--- vendor/mediatek/proprietary/packages/apps/Launcher3/src/com/android/launcher3/ButtonDropTarget.java (版本 360)
+++ vendor/mediatek/proprietary/packages/apps/Launcher3/src/com/android/launcher3/ButtonDropTarget.java (版本 361)
@@ -185,6 +185,13 @@
setupItemInfo(dragObject.dragInfo);
mActive = supportsDrop(dragObject.dragInfo);
}
+ // @ + {
+ int flag = android.provider.Settings.System.getInt(
+ getContext().getContentResolver(),dragObject.dragInfo.getTargetPackage(), 0);
+ if (flag == 1) {
+ mActive = false;
+ }
+ // @ + }
setVisibility(mActive ? View.VISIBLE : View.GONE);
mAccessibleDrag = options.isAccessibleDrag;
