Android应用数据、缓存的清除和获取缓存大小

来源：互联网发布：淘宝改后台软件编辑：程序博客网时间：2024/05/21 17:00
import android.content.Context;import android.os.Environment;import java.io.File;import java.math.BigDecimal;public class ClearData {    private Context context;    public ClearData(Context context){        this.context = context;    }    /**     * 清除应用所有的数据     */    public void clearAllDataOfApplication( String... customfilepath) {        clearInternalCache();        clearExternalCache();        clearDatabases();        clearSharedPreference();        clearFiles();        if (customfilepath == null) {            return;        }        for (String filePath : customfilepath) {            clearCustomCache(filePath);        }    }     /*      *清除外部和内部缓存      */    public void clearAllCache() {        clearExternalCache();        clearInternalCache();    }    /**     * 清除内部缓存(/data/data/包名/cache)     */    public void clearInternalCache() {        deleteFilesByDirectory(context.getCacheDir());    }    /**     * 清除应用SharedPreference(/data/data/包名/shared_prefs)     */    public void clearSharedPreference() {        deleteFilesByDirectory(new File("/data/data/"                + context.getPackageName() + "/shared_prefs"));    }    /**     * *清除所有数据库(/data/data/包名/databases)     */    public void clearDatabases() {        deleteFilesByDirectory(new File("/data/data/"                + context.getPackageName() + "/databases"));    }    /**     * 按名字清除数据库     */    public void clearDatabaseBydbName(String dbName) {        context.deleteDatabase(dbName);    }    /**     * 清除/data/data/包名/files下的内容     */    public void clearFiles() {        deleteFilesByDirectory(context.getFilesDir());    }    /**     * 清除自定义路径下的文件(只支持目录下的文件删除,不支持目录)     */    public void clearCustomCache(String filePath) {        deleteFilesByDirectory(new File(filePath));    }    /**     * 清除外部SDcard下的cache内容(/mnt/sdcard/android/data/包名/cache)     */    public void clearExternalCache() {        if (Environment.getExternalStorageState().equals(                Environment.MEDIA_MOUNTED)) {            deleteFilesByDirectory(context.getExternalCacheDir());        }    }    /**     * 只删除文件夹下的文件     *     */    private static void deleteFilesByDirectory(File directory) {        if (directory != null && directory.exists() && directory.isDirectory()) {            for (File item : directory.listFiles()) {                item.delete();            }        }    }    /*     **获取文件     **Context.getExternalFilesDir() --> SDCard/Android/data/包名/files/ 目录，一般放一些长时间保存的数据     **Context.getExternalCacheDir() --> SDCard/Android/data/包名/cache/目录，一般存放临时缓存数据     */    public static long getFolderSize(File file) throws Exception {        long size = 0;        try {            File[] fileList = file.listFiles();            for (int i = 0; i < fileList.length; i++) {                // 如果下面还有文件                if (fileList[i].isDirectory()) {                    size = size + getFolderSize(fileList[i]);                } else {                    size = size + fileList[i].length();                }            }        } catch (Exception e) {            e.printStackTrace();        }        return size;    }    /**     * 获取应用文件缓存大小     */    public String getCacheSize(File file) throws Exception {        return getFormatSize(getFolderSize(file));    }    /**     * 获取外部和内部缓存大小     */    public String getTotalCacheSize() throws Exception {        long cacheSize = getFolderSize(context.getCacheDir());        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {            cacheSize += getFolderSize(context.getExternalCacheDir());        }        return getFormatSize(cacheSize);    }    /**     * 格式化缓存单位     */    public String getFormatSize(double size) {        double kiloByte = size / 1024;        if (kiloByte < 1) {            return size + "Byte";        }        double megaByte = kiloByte / 1024;        if (megaByte < 1) {            BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));            return result1.setScale(2, BigDecimal.ROUND_HALF_UP)                    .toPlainString() + "KB";        }        double gigaByte = megaByte / 1024;        if (gigaByte < 1) {            BigDecimal result2 = new BigDecimal(Double.toString(megaByte));            return result2.setScale(2, BigDecimal.ROUND_HALF_UP)                    .toPlainString() + "MB";        }        double teraBytes = gigaByte / 1024;        if (teraBytes < 1) {            BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));            return result3.setScale(2, BigDecimal.ROUND_HALF_UP)                    .toPlainString() + "GB";        }        BigDecimal result4 = new BigDecimal(teraBytes);        return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString()                + "TB";    }}
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