android获取系统应用大小的方法

<span style="font-family: Arial, Helvetica, sans-serif;"><span style="font-size:18px;"></span></span><pre name="code" class="java">List<PackageInfo> packages = getPackageManager().getInstalledPackages(0);
public PkgSizeObserver pkgsizeobserver = new PkgSizeObserver();
try {
	Method method;
	method = this.getPackageManager().getClass().getMethod(	"getPackageSizeInfo",
									new Class[] { String.class,
											IPackageStatsObserver.class });
	method.invoke(this.getPackageManager(),	packageInfo.packageName, pkgsizeobserver);
				} catch (NoSuchMethodException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (IllegalAccessException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (IllegalArgumentException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (InvocationTargetException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				synchronized (pkgsizeobserver) {
					try {
						pkgsizeobserver.wait();
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
				totalApp = pkgsizeobserver.cachesize + pkgsizeobserver.codesize
						+ pkgsizeobserver.datasize;}

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<span style="font-family: Arial, Helvetica, sans-serif;"><span style="font-size:18px;">PkgSizeObserver.class</span></span>

<span style="font-size:18px;">//aidl文件形成的Bindler机制服务类
public class PkgSizeObserver extends IPackageStatsObserver.Stub {
	public long cachesize = 0;
	public long datasize = 0;
	public long codesize = 0;
 
	/***
	 * 回调函数。
	 *
	 * @param pStatus
	 *            ,返回数据封装在PackageStats对象中
	 * @param succeeded
	 *            代表回调成功
	 */
	@Override
	public void onGetStatsCompleted(PackageStats pStats, boolean succeeded)
			throws RemoteException {
		// TODO Auto-generated method stub
 
		if(succeeded)
		{
			cachesize = pStats.cacheSize; // 缓存大小
			datasize = pStats.dataSize; // 数据大小
			codesize = pStats.codeSize; // 应用程序大小
			synchronized (this) {
				this.notifyAll();
			}
		}
	}
}</span>