Android获取 应用程序大小，数据大小，缓存大小

在项目中创建，android.content.pm 包名。里面创建两个aidl文件。PackageStats.aidl  和 IPackageStatsObserver.aidl。

PackageStats.aidl

/* //device/java/android/android/view/WindowManager.aidl
**
** Copyright 2007, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
**     http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/

package android.content.pm;

parcelable PackageStats;

IPackageStatsObserver.aidl

/*
**
** Copyright 2007, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
**     http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/

package android.content.pm;

import android.content.pm.PackageStats;
/**
 * API for package data change related callbacks from the Package Manager.
 * Some usage scenarios include deletion of cache directory, generate
 * statistics related to code, data, cache usage(TODO)
 * {@hide}
 */
oneway interface IPackageStatsObserver {
    void onGetStatsCompleted(in PackageStats pStats, boolean succeeded);
}

  import android.app.Activity;
 import android.content.pm.IPackageStatsObserver;
 import android.content.pm.PackageManager;
 import android.content.pm.PackageStats;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
 import android.widget.TextView;

 public class MainActivity extends Activity {

     private TextView tv;
     private static final String ATTR_PACKAGE_STATS = "PackageStats";

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

         tv = new TextView(this);

         setContentView(tv);

         getpkginfo("com.xj.notebook");
     }

     private Handler mHandler = new Handler() {
         public void handleMessage(Message msg) {
             switch (msg.what) {
             case 1:
                 String infoString = "";
                 PackageStats newPs = msg.getData().getParcelable(
                         ATTR_PACKAGE_STATS);
                 if (newPs != null) {
                     infoString += "应用程序大小: " + formatFileSize(newPs.codeSize);
                     infoString += "\n数据大小: " + formatFileSize(newPs.dataSize);
                     infoString += "\n缓存大小: " + formatFileSize(newPs.cacheSize);
                 }
                 tv.setText(infoString);
                 break;
             default:
                 break;
             }
         }
     };

     public void getpkginfo(String pkg) {
         PackageManager pm = getPackageManager();
         try {
             Method getPackageSizeInfo = pm.getClass().getMethod(
                     "getPackageSizeInfo", String.class,
                     IPackageStatsObserver.class);
             getPackageSizeInfo.invoke(pm, pkg, new PkgSizeObserver());
         } catch (Exception e) {
         }
     }

     class PkgSizeObserver extends IPackageStatsObserver.Stub {
         public void onGetStatsCompleted(PackageStats pStats, boolean succeeded) {
             Message msg = mHandler.obtainMessage(1);
             Bundle data = new Bundle();
             data.putParcelable(ATTR_PACKAGE_STATS, pStats);
             msg.setData(data);
             mHandler.sendMessage(msg);
         }
     }

     /**
      * 获取文件大小
      */
     public static String formatFileSize(long length) {
         String result = null;
         int sub_string = 0;
         if (length >= 1073741824) {
             sub_string = String.valueOf((float) length / 1073741824).indexOf(
                     ".");
             result = ((float) length / 1073741824 + "000").substring(0,
                     sub_string + 3) + "GB";
         } else if (length >= 1048576) {
             sub_string = String.valueOf((float) length / 1048576).indexOf(".");
             result = ((float) length / 1048576 + "000").substring(0,
                     sub_string + 3) + "MB";
         } else if (length >= 1024) {
             sub_string = String.valueOf((float) length / 1024).indexOf(".");
             result = ((float) length / 1024 + "000").substring(0,
                     sub_string + 3) + "KB";
         } else if (length < 1024)
             result = Long.toString(length) + "B";
         return result;
     }
 }

<uses-permission android:name="android.permission.GET_PACKAGE_SIZE"/>