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获取缓存大小接口

主要这里的方法已经和7.0不兼容了。

import android.app.usage.UsageStats;import android.app.usage.UsageStatsManager;import android.content.Context;import android.content.pm.PackageManager;import android.os.Process;import android.os.storage.StorageManager;import java.io.IOException;import java.util.ArrayList;import java.util.Map;import android.app.usage.StorageStats;import android.app.usage.StorageStatsManager;    public static long getCacheSizeByAndroidO(Context mContext, String mPackageName) {        StorageManager storageManager = (StorageManager) mContext.getSystemService(Context.STORAGE_SERVICE);        StorageStatsManager storageStatsManager = (StorageStatsManager) mContext.getSystemService(Context.STORAGE_STATS_SERVICE);        try {            StorageStats storageStats = storageStatsManager.queryStatsForPackage(StorageManager.UUID_DEFAULT, mPackageName, Process.myUserHandle());            return storageStats.getCacheBytes();        } catch (PackageManager.NameNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        return 0L;    }

清除缓存接口

这里的接口和7.0保持一致

PackageManager mPm = mContext.getPackageManager();                // need android.permission.DELETE_CACHE_FILES                mPm.deleteApplicationCacheFiles(cacheItem.packageName, new IPackageDataObserver.Stub() {                    @Override                    public void onRemoveCompleted(final String packageName, final boolean succeeded) throws RemoteException {                            ///                        }                    }                });

Andorid 8.0 Setting 模块的源码参考

源码的缓存大小

import com.android.internal.util.Preconditions;import com.android.settings.utils.AsyncLoader;import com.android.settingslib.applications.StorageStatsSource;import com.android.settingslib.applications.StorageStatsSource.AppStorageStats;import java.io.IOException;/** * Fetches the storage stats using the StorageStatsManager for a given package and user tuple. */public class FetchPackageStorageAsyncLoader extends AsyncLoader
   
     {
       private static final String TAG = "FetchPackageStorage";    private final StorageStatsSource mSource;    private final ApplicationInfo mInfo;    private final UserHandle mUser;    @Override    public AppStorageStats loadInBackground() {        AppStorageStats result = null;        try {            result = mSource.getStatsForPackage(mInfo.volumeUuid, mInfo.packageName, mUser);        } catch (NameNotFoundException | IOException e) {            Log.w(TAG, "Package may have been removed during query, failing gracefully", e);        }        return result;    }========================================================================================package com.android.settings.applications;public class AppStorageSettings extends AppInfoWithHeader    @Override    public void onLoadFinished(Loader
    
      loader, AppStorageStats result) {        mSizeController.setResult(result);        updateUiWithSize(result);    }        private void updateUiWithSize(AppStorageStats result) {            } else {            long codeSize = result.getCodeBytes();            long cacheSize = result.getCacheBytes();            long dataSize = result.getDataBytes() - cacheSize;
    
   

源码的清理缓存接口

mPm.deleteApplicationCacheFiles

package com.android.settings.applications;public class AppStorageSettings extends AppInfoWithHeader        implements OnClickListener, Callbacks, DialogInterface.OnClickListener,        LoaderManager.LoaderCallbacks
   
     {
       private static final String TAG = AppStorageSettings.class.getSimpleName();    private ClearCacheObserver mClearCacheObserver;    @Override    public void onClick(View v) {        // 清理缓存按钮        if (v == mClearCacheButton) {            if (mAppsControlDisallowedAdmin != null && !mAppsControlDisallowedBySystem) {                RestrictedLockUtils.sendShowAdminSupportDetailsIntent(                        getActivity(), mAppsControlDisallowedAdmin);                return;            } else if (mClearCacheObserver == null) { // Lazy initialization of observer                mClearCacheObserver = new ClearCacheObserver();            }            mMetricsFeatureProvider.action(getContext(),                    MetricsEvent.ACTION_SETTINGS_CLEAR_APP_CACHE);            // 清理缓存            mPm.deleteApplicationCacheFiles(mPackageName, mClearCacheObserver);    class ClearCacheObserver extends IPackageDataObserver.Stub {
           public void onRemoveCompleted(final String packageName, final boolean succeeded) {            final Message msg = mHandler.obtainMessage(MSG_CLEAR_CACHE);            msg.arg1 = succeeded ? OP_SUCCESSFUL : OP_FAILED;            mHandler.sendMessage(msg);        }    }
   

Android 7.0 的缓存大小接口

PackageManager mPm = mContext.getPackageManager();    mPm.getPackageSizeInfo(mPackageName, new IPackageStatsObserver.Stub() {        @Override        public void onGetStatsCompleted(PackageStats pStats, boolean succeeded) throws RemoteException {            cacheTotalSize = pStats.cacheSize + pStats.externalCacheSize;        }    }

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