如何禁止第三方软件不能安装

类别

需求

索引类别

禁止静默安装install apk

问题描述

对于应用市场来说，内存大小总是不够大,所以在一定空间后（eg:小于500M后）禁止安装第三方软件。

代码关联

android/frameworks/base$ git diff
diff --git a/cmds/pm/src/com/android/commands/pm/Pm.java b/cmds/pm/src/com/android/commands/pm/Pm.java
index a505a69..1f819b1 100644
--- a/cmds/pm/src/com/android/commands/pm/Pm.java
+++ b/cmds/pm/src/com/android/commands/pm/Pm.java
@@ -1081,6 +1081,8 @@ public final class Pm {
                 installFlags |= PackageManager.INSTALL_ALLOW_DOWNGRADE;
             } else if (opt.equals("-g")) {
                 installFlags |= PackageManager.INSTALL_GRANT_RUNTIME_PERMISSIONS;
+            } else if (opt.equals("-c")) { 	//这步主要是为了区分对应是否是内置的强制推送安装的apk
+                installFlags |= PackageManager.INSTALL_USE_HEAD_SPACE_400M;
             } else if (opt.equals("--originating-uri")) {
                 originatingUriString = nextOptionData();
                 if (originatingUriString == null) {
diff --git a/core/java/android/content/pm/PackageManager.java b/core/java/android/content/pm/PackageManager.java
index 433ab66..eec7a56 100755
--- a/core/java/android/content/pm/PackageManager.java
+++ b/core/java/android/content/pm/PackageManager.java
@@ -421,6 +421,9 @@ public abstract class PackageManager {
     /** {@hide} */
     public static final int INSTALL_FORCE_VOLUME_UUID = 0x00000200;

+    /* {@hide}Force the use of reserved space */
+    public static final int INSTALL_USE_HEAD_SPACE_400M = 0x00000400;
+

diff --git a/services/core/java/com/android/server/pm/PackageManagerService.java b/services/core/java/com/android/server/pm/PackageManagerService.java
index dd959ec..12a2bfd 100755
--- a/services/core/java/com/android/server/pm/PackageManagerService.java
+++ b/services/core/java/com/android/server/pm/PackageManagerService.java
@@ -147,6 +147,7 @@ import android.net.Uri;
 import android.os.AsyncTask;
 import android.os.Debug;
 import android.os.Binder;
+import android.os.StatFs;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.Environment;
@@ -10116,10 +10117,38 @@ public class PackageManagerService extends IPackageManager.Stub {
                 verificationParams, packageAbiOverride, UserHandle.getCallingUserId());
     }
+	// get sdcard free
+    public Boolean SpaceEnough() {
+       int headspace = 500;     // head 500M
+       StatFs emmc_sd_path = new StatFs(Environment.getExternalStorageDirectory().getPath());
+       long blockSize = emmc_sd_path.getBlockSize();
+       long availableBlocks = emmc_sd_path.getAvailableBlocks();
+       long emmc_sd_free = blockSize * availableBlocks;
+       int sd_free = new Long(emmc_sd_free/1024/1024).intValue();
+       if (sd_free < headspace)
+           return false;
+
+       return true;
+    }
+
     @Override
     public void installPackageAsUser(String originPath, IPackageInstallObserver2 observer,
             int installFlags, String installerPackageName, VerificationParams verificationParams,
             String packageAbiOverride, int userId) {
+       int useHeadspaceFlags = 1088;		// <-- 0x400 | 0x2
+       boolean useHeadspace_400M = "true".equals(SystemProperties.get("persist.evideo.use.headspace","false"));
+       if (useHeadspace_400M && !SpaceEnough()) {
+           if (installFlags == PackageManager.INSTALL_USE_HEAD_SPACE_400M) {
+               installFlags = 66;			// <-- 0x40 | 0x2  （install -r 的命令flag）
+           } else {
+               try {
+                   Slog.w(TAG, "data headspace less than 400M ,please release space !!!");
+                   observer.onPackageInstalled("", INSTALL_FAILED_USER_RESTRICTED, null, null);
+                   return ;
+               } catch (RemoteException re) {
+               }
+           }
+       }
+
         mContext.enforceCallingOrSelfPermission(android.Manifest.permission.INSTALL_PACKAGES, null);

         final int callingUid = Binder.getCallingUid();

原理：就是将所有的installFlags拦截下来，除了特定设置的标志位（0x400【INSTALL_USE_HEAD_SPACE_400M】 | 0x40 【INSTALL_ALL_USERS】）才可以安装.另外还有一个就是属性值（persist.evideo.use.headspace）设定是用来区分不需要此功能的。如果是特定的标志位那么执行（0x2 【INSTALL_REPLACE_EXISTING】| 0x40 ）静默安装apk。

①Pm.java 添加解释：后续补充如何实现pm install到Pm.java的过程。

②PackageManagerService.java添加解释：installPackageAsUser（）这个是静默应用安装apk的接口。

遇到的坑

由于更新了api接口导致引发的错误，添加{@hide}将其隐藏,对应编译就可以正常编译通过了。

改进建议

工作记录…

本文地址：https://blog.csdn.net/xcyansmile/article/details/110180433