Question

我只想显示所有已安装的应用程序名称列表以及缓存大小。缓存大小必须与Android设备中显示的本机设置应用程序相同。

我能够列出所有已安装的应用程序pkg名称，但无法计算本机设置应用程序显示的相同高速缓存大小（我在谈论设置中清除高速缓存选项的位置）。

pkNames = getPackageManager().getInstalledPackages(0);

                    ArrayAdapter<PackageInfo> adapter = new ArrayAdapter<PackageInfo>(this,
                            android.R.layout.simple_list_item_1, pkNames);
                     final PackageManager pm = getPackageManager();
                    for(int i =0;i<pkNames.size();i++)
                    {
                        ApplicationInfo applicationInfo = pm.getApplicationInfo(pkNames.get(i).packageName.toString(), 0);
                        File file = new File(applicationInfo.publicSourceDir);
                        long size = file.length();
                        System.out.println("application name == "+pkNames.get(i).packageName.toString()+"  ,and size of cache is == "+size(this, size));
                    }

我使用此代码，但它会给我该应用程序的.apk大小。 :( 请帮忙提前谢谢。

Answer 1

直接获取已安装应用程序的缓存大小，无法获取。使用PackageManger时，我们无法直接获取有关已安装包大小的详细信息，因为抽象getPackageSizeInfo方法无法直接访问，因此使用Java Reflection可以调用它。如果将来可能无效方法名称更改或任何更改的内容。

您需要创建AIDL IPackageStatsObserver。aidl＆amp; PackageStats.aidl应该在android.content.pm包中，因为您无法直接访问它们。

<强> IPackageStatsObserver.aidl

package android.content.pm;
import android.content.pm.PackageStats;
oneway interface IPackageStatsObserver {
void onGetStatsCompleted(in android.content.pm.PackageStats pStats, boolean succeeded);
}

<强> PackageStats.aidl

package android.content.pm;
parcelable PackageStats;

IPackageStatsObserver.aidl＆amp; PackageStats.aidl都将它保存在android.content.pm包中。的 IDataStatus

public interface IDataStatus { public void onStatusListner(String msg); }

<强>活动

public class MyScreen extends Activity implements OnClickListener { public static final int FETCH_PACKAGE_SIZE_COMPLETED = 100; public static final int ALL_PACAGE_SIZE_COMPLETED = 200; IDataStatus onIDataStatus; TextView lbl_cache_size; ProgressDialog pd; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); findViewById(R.id.btn_get_cacheSize).setOnClickListener(this); lbl_cache_size = (TextView) findViewById(R.id.lbl_cache_size); // clearCache(); } private void showProgress(String message) { pd = new ProgressDialog(this); pd.setIcon(R.drawable.ic_launcher); pd.setTitle("Please Wait..."); pd.setMessage(message); pd.setCancelable(false); pd.show(); } long packageSize = 0, size = 0; AppDetails cAppDetails; public ArrayList<PackageInfoStruct> res; private void getpackageSize() { cAppDetails = new AppDetails(this); res = cAppDetails.getPackages(); if (res == null) return; for (int m = 0; m < res.size(); m++) { PackageManager pm = getPackageManager(); Method getPackageSizeInfo; try { getPackageSizeInfo = pm.getClass().getMethod( "getPackageSizeInfo", String.class, IPackageStatsObserver.class); getPackageSizeInfo.invoke(pm, res.get(m).pname, new cachePackState()); } catch (SecurityException e) { e.printStackTrace(); } catch (NoSuchMethodException e) { e.printStackTrace(); } catch (IllegalArgumentException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); } } handle.sendEmptyMessage(ALL_PACAGE_SIZE_COMPLETED); Log.v("Total Cache Size", " " + packageSize); } private Handler handle = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case FETCH_PACKAGE_SIZE_COMPLETED: if (packageSize > 0) size = (packageSize / 1024000); lbl_cache_size.setText("Cache Size : " + size + " MB"); break; case ALL_PACAGE_SIZE_COMPLETED: if (null != pd) if (pd.isShowing()) pd.dismiss(); break; default: break; } } }; private class cachePackState extends IPackageStatsObserver.Stub { @Override public void onGetStatsCompleted(PackageStats pStats, boolean succeeded) throws RemoteException { Log.d("Package Size", pStats.packageName + ""); Log.i("Cache Size", pStats.cacheSize + ""); Log.w("Data Size", pStats.dataSize + ""); packageSize = packageSize + pStats.cacheSize; Log.v("Total Cache Size", " " + packageSize); handle.sendEmptyMessage(FETCH_PACKAGE_SIZE_COMPLETED); } } @Override public void onClick(View v) { switch (v.getId()) { case R.id.btn_get_cacheSize: size = 0; packageSize = 0; showProgress("Calculating Cache Size..!!!"); /** * You can also use async task * */ new Thread(new Runnable() { @Override public void run() { getpackageSize(); } }).start(); break; } } }

<强> AppDetails

public class AppDetails { Activity mActivity; public ArrayList<PackageInfoStruct> res = new ArrayList<PackageInfoStruct>(); public ListView list; public String app_labels[]; public AppDetails(Activity mActivity) { this.mActivity = mActivity; } public ArrayList<PackageInfoStruct> getPackages() { ArrayList<PackageInfoStruct> apps = getInstalledApps(false); /* * false = * no system * packages */ final int max = apps.size(); for (int i = 0; i < max; i++) { apps.get(i); } return apps; } private ArrayList<PackageInfoStruct> getInstalledApps(boolean getSysPackages) { List<PackageInfo> packs = mActivity.getPackageManager() .getInstalledPackages(0); try { app_labels = new String[packs.size()]; } catch (Exception e) { Toast.makeText(mActivity.getApplicationContext(), e.getMessage(), Toast.LENGTH_SHORT).show(); } for (int i = 0; i < packs.size(); i++) { PackageInfo p = packs.get(i); if ((!getSysPackages) && (p.versionName == null)) { continue; } PackageInfoStruct newInfo = new PackageInfoStruct(); newInfo.appname = p.applicationInfo.loadLabel( mActivity.getPackageManager()).toString(); newInfo.pname = p.packageName; newInfo.datadir = p.applicationInfo.dataDir; newInfo.versionName = p.versionName; newInfo.versionCode = p.versionCode; newInfo.icon = p.applicationInfo.loadIcon(mActivity .getPackageManager()); res.add(newInfo); app_labels[i] = newInfo.appname; } return res; } class PackageInfoStruct { String appname = ""; String pname = ""; String versionName = ""; int versionCode = 0; Drawable icon; String datadir = ""; } }

XML

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <Button android:id="@+id/btn_get_cacheSize" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Get Cache Size" /> <TextView android:id="@+id/lbl_cache_size" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Cache Size : " /> </LinearLayout>

Answer 2

使用以下路径将应用程序缓存文件夹放入内存

“/数据/数据/ com.your.package.appname /缓存”

计算磁盘上的应用程序缓存大小。

如何以编程方式计算已安装应用程序的所有缓存大小？

2 个答案: