Android 本地文件读取， 数据库文件备份(Android本地文件怎么显示歌词)

推荐整理分享Android 本地文件读取， 数据库文件备份(Android本地文件怎么显示歌词)，希望有所帮助，仅作参考，欢迎阅读内容。

文章相关热门搜索词:安卓存储本地文件,安卓手机的本地文件在哪里,安卓手机的本地文件在哪里,Android本地文件怎么显示歌词,安卓本地文件,Android本地文件路径,Android 本地文件file标识,Android 本地文件加密解密,内容如对您有帮助，希望把文章链接给更多的朋友！

String res = "";

try{

InputStream in = getResources().openRawResource(R.raw.bbi);

//在Testresrawbbi.txt,

int length = in.available();

byte [] buffer = new byte[length];

in.read(buffer);

//res = EncodingUtils.getString(buffer, "UTF-8");

//res = EncodingUtils.getString(buffer, "UNICODE");

res = EncodingUtils.getString(buffer, "BIG5");

//依bbi.txt的编码类型选择合适的编码，如果不调整会乱码

in.close();

}catch(Exception e){

e.printStackTrace();

}

myTextView.setText(res);//把得到的内容显示在TextView上

String fileName = "yan.txt"; //文件名字

String res="";

try{

InputStream in = getResources().getAssets().open(fileName);

// Testassetsyan.txt这里有这样的文件存在

int length = in.available();

byte [] buffer = new byte[length];

in.read(buffer);

res = EncodingUtils.getString(buffer, "UTF-8");

}catch(Exception e){

e.printStackTrace();

}

String fileName = "/sdcard/Y.txt";

//也可以用String fileName = "mnt/sdcard/Y.txt";

String res="";

try{

FileInputStream fin = new FileInputStream(fileName);

//FileInputStream fin = openFileInput(fileName);

//用这个就不行了，必须用FileInputStream

int length = fin.available();

byte [] buffer = new byte[length];

fin.read(buffer);

res = EncodingUtils.getString(buffer, "UTF-8");

fin.close();

}catch(Exception e){

e.printStackTrace();

}

myTextView.setText(res);

String fileName = "TEST.txt";

String message = "FFFFFFFFFFFF" ;

writeFileData(fileName, message);

public voidwriteFileData(String fileName,String message){

try{

FileOutputStream fout =openFileOutput(fileName, MODE_PRIVATE);

byte [] bytes = message.getBytes();

fout.write(bytes);

fout.close();

}

catch(Exception e){

e.printStackTrace();

}

}

//写文件在./data/data/com.tt/files/下面

public voidwriteFileData(String fileName,String message){

try{

FileOutputStream fout =openFileOutput(fileName, MODE_PRIVATE);

byte [] bytes = message.getBytes();

fout.write(bytes);

fout.close();

}

catch(Exception e){

e.printStackTrace();

}

}

//-------------------------------------------------------

//读文件在./data/data/com.tt/files/下面

public String readFileData(String fileName){

String res="";

try{

FileInputStream fin = openFileInput(fileName);

int length = fin.available();

byte [] buffer = new byte[length];

fin.read(buffer);

res = EncodingUtils.getString(buffer, "UTF-8");

fin.close();

}

catch(Exception e){

e.printStackTrace();

}

return res;

}

//写在/mnt/sdcard/目录下面的文件

public voidwriteFileSdcard(String fileName,String message){

try{

//FileOutputStream fout = openFileOutput(fileName, MODE_PRIVATE);

FileOutputStream fout = newFileOutputStream(fileName);

byte [] bytes = message.getBytes();

fout.write(bytes);

fout.close();

}

catch(Exception e){

e.printStackTrace();

}

}

//读在/mnt/sdcard/目录下面的文件

public String readFileSdcard(String fileName){

String res="";

try{

FileInputStream fin = new FileInputStream(fileName);

int length = fin.available();

byte [] buffer = new byte[length];

fin.read(buffer);

res = EncodingUtils.getString(buffer, "UTF-8");

fin.close();

}

catch(Exception e){

e.printStackTrace();

}

return res;

}

注： openFileOutput是在raw里编译过的，FileOutputStream是任何文件都可以

数据库文件备份：

import java.io.File; import java.io.IOException; import org.apache.commons.io.FileUtils; import android.content.Context; import android.os.Environment; import android.widget.Toast; import com.sinaapp.msdxblog.androidkit.util.ResourceUtil; import com.sinaapp.msdxblog.androidkit.util.entity.ApkInfo; /** * @author Geek_Soledad (@uc.com) */ public class Backup { private String SHARED_PREFS; private String DATABASES; private String APP_PATH; private Context mContext; private String BACKUP_PATH; private String BACKUP_DATABASES; private String BACKUP_SHARED_PREFS; public Backup(Context context) { mContext = context; ApkInfo apkInfo = new ResourceUtil(context).getApkInfo(); APP_PATH = new StringBuilder("/data/data/").append(apkInfo.packageName) .toString(); SHARED_PREFS = APP_PATH &#; "/shared_prefs"; DATABASES = APP_PATH &#; "/databases"; if (Environment.MEDIA_MOUNTED.equals(Environment .getExternalStorageState())) { BACKUP_PATH = "/sdcard/lurencun/backup"; } else { BACKUP_PATH = "/com.lurencun/backup/"; Toast.makeText(mContext, "没有检测到SD卡，可能无法备份成功", Toast.LENGTH_SHORT) .show(); } BACKUP_PATH &#;= apkInfo.packageName; BACKUP_DATABASES = BACKUP_PATH &#; "/database"; BACKUP_SHARED_PREFS = BACKUP_PATH &#; "/shared_prefs"; } /** * 备份文件 * * @return 当且仅当数据库及配置文件都备份成功时返回true。 */ public boolean doBackup() { return backupDB() && backupSharePrefs(); } private boolean backupDB() { return copyDir(DATABASES, BACKUP_DATABASES, "备份数据库文件成功:" &#; BACKUP_DATABASES, "备份数据库文件失败"); } private boolean backupSharePrefs() { return copyDir(DATABASES, BACKUP_DATABASES, "备份配置文件成功:" &#; BACKUP_SHARED_PREFS, "备份配置文件失败"); } /** * 恢复 * * @return 当且仅当数据库及配置文件都恢复成功时返回true。 */ public boolean doRestore() { return restoreDB() && restoreSharePrefs(); } private boolean restoreDB() { return copyDir(BACKUP_DATABASES, DATABASES, "恢复数据库文件成功", "恢复数据库文件失败"); } private boolean restoreSharePrefs() { return copyDir(BACKUP_SHARED_PREFS, SHARED_PREFS, "恢复配置文件成功", "恢复配置文件失败"); } private final void showToast(String msg) { Toast.makeText(mContext, msg, Toast.LENGTH_SHORT).show(); } /** * 复制目录 * * @param srcDir * 源目录 * @param destDir * 目标目录 * @param successMsg * 复制成功的提示语 * @param failedMsg * 复制失败的提示语 * @return 当复制成功时返回true, 否则返回false。 */ private final boolean copyDir(String srcDir, String destDir, String successMsg, String failedMsg) { try { FileUtils.copyDirectory(new File(srcDir), new File(destDir)); } catch (IOException e) { e.printStackTrace(); showToast(failedMsg); return false; } showToast(successMsg); return true; } }

Android——SharedPreferences实现登录界面的记住密码和自动登录功能 一、项目开发1、项目运行效果图2、开发概要主要功能SharedPreferences介绍，其是Android平台上一个轻量级的存储类，用来保存应用的一些常用配置，比如Act

俩个时间戳相减 importjava.text.ParseException;importjava.text.SimpleDateFormat;importjava.util.Date;/***俩个时间戳相减*年6月8日::*@authorcfs*/publicclasstestTime{publicstaticvoidmain(String[]args

Android4.4 wpa_supplicant深入分析之wpa_supplicant初始化流程续 下面我们将接上一篇文章继续分析main中第二个关键函数wpa_supplicant_add_iface。wpa_supplicant_add_iface用于向wpa_supplicant添加接口设备。所谓的添加（addiface),其