6

我正在开发一个 Cache-Cleaner 应用程序，当我在 PackageManager 中调用一个隐藏方法时，我得到了一个 SecurityException，尽管我已经给了我的应用程序使用权限“DELETE_CACHE_FILES”

使用权限：

uses-permission android:name="android.permission.DELETE_CACHE_FILES"
uses-permission android:name="android.permission.CLEAR_APP_CACHE"
uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
uses-permission android:name="android.permission.CLEAR_APP_USER_DATA"
uses-permission android:name="android.permission.GET_PACKAGE_SIZE"

反映的方法：

Method method = getPackageManager().getClass().getMethod("deleteApplicationCacheFiles", String.class, IPackageDataObserver.class);

错误：

java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at <MY_PACKAGE_NAME>.MainActivity$1.onClick(MainActivity.java:70)
at android.view.View.performClick(View.java:2485)
at android.view.View$PerformClick.run(View.java:9080)
at android.os.Handler.handleCallback(Handler.java:587)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:3683)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.SecurityException: Neither user 10037 nor current process has   android.permission.DELETE_CACHE_FILES.
at android.os.Parcel.readException(Parcel.java:1322)
at android.os.Parcel.readException(Parcel.java:1276)
at android.content.pm.IPackageManager$Stub$Proxy.deleteApplicationCacheFiles(IPackageManager.java:2346)
at android.app.ContextImpl$ApplicationPackageManager.deleteApplicationCacheFiles(ContextImpl.java:2562)
... 14 more

第 70 行：

 method.invoke(getPackageManager(), app.packageName, dataObserver);

它说我没有权限，但我已经在我的清单中取消了它......

编辑：我发现了这个；

W/PackageManager(62): Not granting permission android.permission.DELETE_CACHE_FILES to package <MY_PACKAGE_NAME>.cachecleaner (protectionLevel=3 flags=0x8be46)

EDIT2：deleteApplicationCacheFiles 的声明（通过 method.toGenericString() 获得）：

public void android.app.ContextImpl$ApplicationPackageManager.deleteApplicationCacheFiles(java.lang.String, android.content.pm.IPackageDataObserver)
4

4 回答 4

6

DELETE_CACHE_FILES是一种signature|system权限，这意味着它只能由使用固件签名密钥签名或安装在系统分区上的应用程序持有（例如，由 root 设备用户）。普通 SDK 应用程序无法持有此权限。

于 2012-12-26T13:50:29.140 回答
3 
try to use this i tried this code and it worked for me...

private static final long CACHE_APP = Long.MAX_VALUE;
private CachePackageDataObserver mClearCacheObserver; 
void clearCache() {
    if (mClearCacheObserver == null) {
        mClearCacheObserver = new CachePackageDataObserver();
    }

    PackageManager mPM = getPackageManager();

    @SuppressWarnings("rawtypes")
    final Class[] classes = { Long.TYPE, IPackageDataObserver.class };

    Long localLong = Long.valueOf(CACHE_APP);

    try {
        Method localMethod = mPM.getClass().getMethod(
                "freeStorageAndNotify", classes);

        /*
         * Method localMethod=mPM.getClass()
         * .getDeclaredMethod("deleteApplicationCacheFiles", String.class,
         * IPackageDataObserver.class );
         */
        /*
         * Start of inner try-catch block
         */
        try {
            localMethod.invoke(mPM, localLong, mClearCacheObserver);
            // localMethod.invoke(mPM, packageName, mClearCacheObserver);
        } catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        /*
         * End of inner try-catch block
         */
    } catch (NoSuchMethodException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }
}

private class CachePackageDataObserver extends IPackageDataObserver.Stub {
    public void onRemoveCompleted(String packageName, boolean succeeded) {
        runOnUiThread(new Runnable() {
            public void run() {

                Toast.makeText(MainActivity.this, "cache memory cleared",
                        5000).show();
            }
        });

        Log.d("cachedel", "cache deleted");
    }// End of onRemoveCompleted() method
}
于 2014-06-17T11:00:48.503 回答
1

你调用这个：

method.setAccessible(true);
于 2012-12-26T12:45:08.203 回答
-1

Try this function freeStorageAndNotify with premission

android.permission.CLEAR_APP_CACHE

.

于 2016-08-05T08:09:40.697 回答