清除缓存的代码

  权限

 一：删除所有缓存

/**
	 * 得到缓存大小，并开始封装数据，发送handler
	 * 
	 * @param pm
	 * @param info
	 */
	protected void getCatcheSpace(final PackageManager pm,
			final ApplicationInfo info) {
		try {
			Class clazz = Class.forName("android.content.pm.PackageManager");
			Method method = clazz.getMethod("getPackageSizeInfo", String.class,
					IPackageStatsObserver.class);
			IPackageStatsObserver.Stub iPackageStatsObserver = new IPackageStatsObserver.Stub() {

				@Override
				public void onGetStatsCompleted(PackageStats pStats,
						boolean succeeded) throws RemoteException {

					long space = pStats.cacheSize;
					// 得到缓存，触发handler
					if (space > 0) {
						// 有缓存
						catcheInfo catcheInfo = new catcheInfo();
						catcheInfo.icon = info.loadIcon(pm);
						catcheInfo.name = info.loadLabel(pm).toString();
						catcheInfo.packagename = info.packageName;
						String str = Formatter.formatFileSize(
								getApplicationContext(), space);
						catcheInfo.spaceStr = str;
						Message msg = Message.obtain();
						msg.what = CATCHEINFO;
						msg.obj = catcheInfo;
						mHandler.sendMessage(msg);
					} else {
						// 没缓存
						Message msg = Message.obtain();
						msg.what = ONLYNAME;
						msg.obj = info.loadLabel(pm);
						mHandler.sendMessage(msg);
					}
					// 设置进度
					pb_getCatcheMessage.setProgress(++indext);
					if (indext >= pb_getCatcheMessage.getMax()) {
						mHandler.sendEmptyMessage(FINISH);
					}
				}
			};
			// 进行运算
			method.invoke(pm, info.packageName, iPackageStatsObserver);

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	private class catcheInfo {
		public Drawable icon;
		public String name;
		public String packagename;
		public String spaceStr;

	}

 二：得到每个应用的缓存

				PackageManager pm = getPackageManager();
				try {
					// 获得类名
					Class clazz = Class
							.forName("android.content.pm.PackageManager");
					// 获得方法名
					Method method = clazz.getMethod("freeStorageAndNotify",
							long.class, IPackageDataObserver.class);
					// 删除成功的回调函数
					IPackageDataObserver.Stub iPackageStatsObserver = new IPackageDataObserver.Stub() {

						@Override
						public void onRemoveCompleted(String packageName,
								boolean succeeded) throws RemoteException {
							mHandler.sendEmptyMessage(REMOVEALL);
						}
					};
					// 执行删除方法
					// 参数：包管理者，想要删除多大空间（尽可能的得到），删除成功的回调函数
					method.invoke(pm, Long.MAX_VALUE, iPackageStatsObserver);
				} catch (Exception e) {
					e.printStackTrace();
				}

			

三：打开某个应用的缓存页面

Intent intent = new Intent("android.settings.APPLICATION_DETAILS_SETTINGS");

intent.addCategory("android.intent.category.DEFAULT");
intent.setData(Uri.parse("package:" + info.packagename));

startActivity(intent);