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 += "
数据大小: " + formatFileSize(newPs.dataSize);
                    infoString += "
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"/>