告别卡顿！Android系统中清理缓存的实用方法和技巧

先写一个工具类

import android.content.Context;
import android.os.Environment;
import android.text.TextUtils;
import java.io.File;
import java.math.BigDecimal;
public class DataCleanManager {
    /**
     * 需要查下缓存大小
     * @param context
* @return
* @throws Exception
     */
public static String getTotalCacheSize(Context context) throws Exception {
        long cacheSize = getFolderSize(context.getCacheDir());
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            cacheSize += getFolderSize(context.getExternalCacheDir());
        }
        return getFormatSize(cacheSize);
    }
    /**
     * 清空缓存
     * @param context
*/
public static void clearAllCache(Context context) {
        deleteDir(context.getCacheDir());
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            deleteDir(context.getExternalCacheDir());
        }
    }
    private static boolean deleteDir(File dir) {
        if (dir != null && dir.isDirectory()) {
            String[] children = dir.list();
            for (int i = 0; i < children.length; i++) {
                boolean success = deleteDir(new File(dir, children[i]));
                if (!success) {
                    return false;
                }
            }
        }
        return dir.delete();
    }
    /**
     * * 清除本应用内部缓存(/data/data/com.xxx.xxx/cache) * *
     *
     * @param context
*/
public static void cleanInternalCache(Context context) {
        deleteFilesByDirectory(context.getCacheDir());
    }
    /**
     * * 清除本应用所有数据库(/data/data/com.xxx.xxx/databases) * *
     *
     * @param context
*/
public static void cleanDatabases(Context context) {
        deleteFilesByDirectory(new File("/data/data/"
+ context.getPackageName() + "/databases"));
    }
    /**
     * * 清除本应用SharedPreference(/data/data/com.xxx.xxx/shared_prefs) *
     *
     * @param context
*/
public static void cleanSharedPreference(Context context) {
        deleteFilesByDirectory(new File("/data/data/"
+ context.getPackageName() + "/shared_prefs"));
    }
    /**
     * * 按名字清除本应用数据库 * *
     *
     * @param context
* @param dbName
*/
public static void cleanDatabaseByName(Context context, String dbName) {
        context.deleteDatabase(dbName);
    }
    /**
     * * 清除/data/data/com.xxx.xxx/files下的内容 * *
     *
     * @param context
*/
public static void cleanFiles(Context context) {
        deleteFilesByDirectory(context.getFilesDir());
    }
    /**
     * * 清除外部cache下的内容(/mnt/sdcard/android/data/com.xxx.xxx/cache)
     *