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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;