Question

我已在设备中安装了应用，但无法在SD卡上找到它。我将/data/data/com.abc.xyz/databases路径作为安装路径。但它没有在SD卡中显示。

实际上我是从res / raw文件夹解压缩SD卡中的文件。

只是想知道我的数据去了哪里？如何读写SD卡数据。

以下是代码

final InputStream myInput = new GZIPInputStream( this.myContext.getResources( ).openRawResource(
                R.raw.clc_android ) );

        String dir = Environment.DIRECTORY_DCIM;

        final String outFileName = DB_PATH+DB_NAME;

        if (new File(DB_PATH).exists() == false) {

            new File(DB_PATH).mkdirs();
        }

        final OutputStream myOutput = new FileOutputStream( outFileName );

        //transfer bytes from the inputfile to the outputfile
        final byte[ ] buffer = new byte[ 1024 ];
        int length;
        while ( ( length = myInput.read( buffer ) ) > 0 )
        {
            myOutput.write( buffer, 0, length );
        }

下面是android清单文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.clc.encyclopedia" android:versionCode="23"
android:versionName="14.0" android:installLocation="auto">

<uses-sdk android:minSdkVersion="8" android:targetSdkVersion="20" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET"/>   
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_INTERNAL_STORAGE" /> 
 <uses-permission android:name="android.permission.WRITE_INTERNAL_STORAGE" />

Answer 1

您好我可以告诉您如何通过SD卡复制数据库。我尝试修改您发布的代码，见下文。

private static String EXTERNAL_STORAGE = Environment.getExternalStorageDirectory().getPath();

private static String DIR_APP_HOME = "yourapphome";

private static String getExternalStoragePath() {
        return new StringBuilder().append(EXTERNAL_STORAGE).append("/").toString();
}

public static String appHomeDirectory() {
        return new StringBuilder().append(getExternalStoragePath()).append(DIR_APP_HOME).append("/").toString();
}


public static void verifyAppHomePath() {
        File mFile = new File(appHomeDirectory());
        if (!mFile.exists()) {
            mFile.mkdir();
        }
        mFile = null;
}

现在如何使用代码中的所有函数。这将在您的SD卡内创建您想要的名称。

final InputStream myInput = new GZIPInputStream( this.myContext.getResources( ).openRawResource(R.raw.clc_android ) );

String dir = Environment.DIRECTORY_DCIM;

// this will verify the directory is present or not if not present then it will create the empty directory
verifyAppHomePath();

// assign the your application home directory
DB_PATH = appHomeDirectory();

// build the database path with database file name
final String outFileName = DB_PATH+DB_NAME;

final OutputStream myOutput = new FileOutputStream( outFileName );

//transfer bytes from the inputfile to the outputfile 
final byte[ ] buffer = new byte[ 1024 ];
int length;
while ( ( length = myInput.read( buffer ) ) > 0 )
{ 
    myOutput.write( buffer, 0, length );
}

如果您有任何疑问，请告诉我，如果您不知道如何访问SD卡数据库，请告诉我。谢谢。

Android：无法在SD卡上找到应用程序

1 个答案: