Android 8.1预置应用高级权限之安装未知应用权限

本文链接：https://blog.youkuaiyun.com/qq_39048075/article/details/109548156

前言

项目需要给某个应用授予安装未知应用权限防止进入设置的授权界面,一开始和之前一样想着在framework中的DefaultPermissionGrantPolicy.java中授予所有权限,哈哈,结果是啥,你应该想的到的

具体解决

解决之前的操作,像495行代码一样设置安装未知应用权限,然并卵,其他的权限是可以的,这个一点反应都没有

恩,上面的操作不靠谱,那就只能换另外的操作了,想着PackageManagerService.java中可能可以,就在这里面尝试了一下

结果还是不行.没办法了,只能看Settings 的源码了

看看点击之后到底做了什么操作

下面是安装未知应用界面的代码

packages/apps/Settings/src/com/android/settings/applications/ExternalSourcesDetails.java

package com.android.settings.applications;

import android.app.AlertDialog;
import android.app.AppOpsManager;
import android.content.Context;
import android.os.Bundle;
import android.os.UserHandle;
import android.os.UserManager;
import android.support.v7.preference.Preference;
import android.support.v7.preference.Preference.OnPreferenceChangeListener;

import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
import com.android.settings.R;
import com.android.settings.Settings;
import com.android.settings.applications.AppStateInstallAppsBridge.InstallAppsState;
import com.android.settingslib.RestrictedSwitchPreference;
import com.android.settingslib.applications.ApplicationsState.AppEntry;

import static android.app.Activity.RESULT_CANCELED;
import static android.app.Activity.RESULT_OK;

public class ExternalSourcesDetails extends AppInfoWithHeader
        implements OnPreferenceChangeListener {

    private static final String KEY_EXTERNAL_SOURCE_SWITCH = "external_sources_settings_switch";

    private AppStateInstallAppsBridge mAppBridge;
    private AppOpsManager mAppOpsManager;
    private UserManager mUserManager;
    private RestrictedSwitchPreference mSwitchPref;
    private InstallAppsState mInstallAppsState;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        final Context context = getActivity();
        mAppBridge = new AppStateInstallAppsBridge(context, mState, null);
        mAppOpsManager = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
        mUserManager = UserManager.get(context);

        addPreferencesFromResource(R.xml.external_sources_details);
        mSwitchPref = (RestrictedSwitchPreference) findPreference(KEY_EXTERNAL_SOURCE_SWITCH);
        mSwitchPref.setOnPreferenceChangeListener(this);
    }

    @Override
    public boolean onPreferenceChange(Preference preference, Object newValue) {
        final boolean checked = (Boolean) newValue;
        if (preference == mSwitchPref) {
            if (mInstallAppsState != null && checked != mInstallAppsState.canInstallApps()) {
                if (Settings.ManageAppExternalSourcesActivity.class.getName().equals(
                        getIntent().getComponent().getClassName())) {
                    setResult(checked ? RESULT_OK : RESULT_CANCELED);
                }
                setCanInstallApps(checked);
                refreshUi();
            }
            return true;
        }
        return false;
    }

    static CharSequence getPreferenceSummary(Context context, AppEntry entry) {
        final UserManager um = UserManager.get(context);
        final int userRestrictionSource = um.getUserRestrictionSource(
                UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES,
                UserHandle.getUserHandleForUid(entry.info.uid));
        switch (userRestrictionSource) {
            case UserManager.RESTRICTION_SOURCE_DEVICE_OWNER:
            case UserManager.RESTRICTION_SOURCE_PROFILE_OWNER:
                return context.getString(R.string.disabled_by_admin);
            case UserManager.RESTRICTION_SOURCE_SYSTEM:
                return context.getString(R.string.disabled);
        }

        final InstallAppsState appsState = new AppStateInstallAppsBridge(context, null, null)
                .createInstallAppsStateFor(entry.info.packageName, entry.info.uid);

        return context.getString(appsState.canInstallApps()
                ? R.string.app_permission_summary_allowed
                : R.string.app_permission_summary_not_allowed);
    }

    private void setCanInstallApps(boolean newState) {
        mAppOpsManager.setMode(AppOpsManager.OP_REQUEST_INSTALL_PACKAGES,
                mPackageInfo.applicationInfo.uid, mPackageName,
                newState ? AppOpsManager.MODE_ALLOWED : AppOpsManager.MODE_ERRORED);
    }

    @Override
    protected boolean refreshUi() {
        if (mUserManager.hasBaseUserRestriction(UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES,
                UserHandle.of(UserHandle.myUserId()))) {
            mSwitchPref.setChecked(false);
            mSwitchPref.setSummary(R.string.disabled);
            mSwitchPref.setEnabled(false);
            return true;
        }
        mSwitchPref.checkRestrictionAndSetDisabled(UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES);
        if (mSwitchPref.isDisabledByAdmin()) {
            return true;
        }
        mInstallAppsState = mAppBridge.createInstallAppsStateFor(mPackageName,
                mPackageInfo.applicationInfo.uid);
        if (!mInstallAppsState.isPotentialAppSource()) {
            // Invalid app entry. Should not allow changing permission
            mSwitchPref.setEnabled(false);
            return true;
        }
        mSwitchPref.setChecked(mInstallAppsState.canInstallApps());
        return true;
    }

    @Override
    protected AlertDialog createDialog(int id, int errorCode) {
        return null;
    }

    @Override
    public int getMetricsCategory() {
        return MetricsEvent.MANAGE_EXTERNAL_SOURCES;
    }
}

可以看到具体的实现是setCanInstallApps方法

private void setCanInstallApps(boolean newState) {
        mAppOpsManager.setMode(AppOpsManager.OP_REQUEST_INSTALL_PACKAGES,
                mPackageInfo.applicationInfo.uid, mPackageName,
                newState ? AppOpsManager.MODE_ALLOWED : AppOpsManager.MODE_ERRORED);
    }

恩,通过AppOpsManager来设置的,所有我们只要开机时调用这个方法指定对应APK包名即可

AppOpsManager.OP_REQUEST_INSTALL_PACKAGES, mPackageName, AppOpsManager.MODE_ALLOWED : AppOpsManager.MODE_ERRORED
这四个值我们不用管,就在AppOpsManager中,只需找到mPackageInfo.applicationInfo.uid 即可,然后我们发现mPackageInfo 不在这个类中定义,应该是属于它的父类中定义的,而ExternalSourcesDetails 继承于 AppInfoWithHeader类但是呢,在AppInfoWithHeader也没有发现这个的定义,所以我们要再往上找,然后在AppInfoWithHeader父类AppInfoBase类的第73行找到了mPackageInfo的定义

73行仅仅只是定义个变量,最终赋值是在retrieveAppEntry方法中

mPm根据80行可以知道是PackageManager

mAppOpsManager.setMode(AppOpsManager.OP_REQUEST_INSTALL_PACKAGES,
                mPackageInfo.applicationInfo.uid, mPackageName,
                newState ? AppOpsManager.MODE_ALLOWED : AppOpsManager.MODE_ERRORED);

所以上面这个方法的所有值我们都已经知道了,照猫画虎即可

整个方法的实现如下

try {
            AppOpsManager mAppOpsManager = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
			PackageManager mPm = context.getPackageManager();
			PackageInfo mPackageInfo = mPm.getPackageInfo(packageName,
                        PackageManager.MATCH_DISABLED_COMPONENTS |
                        PackageManager.MATCH_ANY_USER |
                        PackageManager.GET_SIGNATURES |
                        PackageManager.GET_PERMISSIONS);
			
            mAppOpsManager.setMode(AppOpsManager.OP_REQUEST_INSTALL_PACKAGES,
                mPackageInfo.applicationInfo.uid, packageName,AppOpsManager.MODE_ALLOWED);
			}catch (NameNotFoundException e) {
                Log.e(TAG, "Exception when retrieving package:" + packageName, e);  
        }

因此只需在开机的时候使用此方法设置对应的APK即可

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