安卓Studio导出数据库与手机录制音频

安卓Studio导出数据库

1. 创建数据库

In Android applications, we commonly use SQLite as our database. Here is an example of how to create a SQLite database:

import android.content.Context;import android.database.sqlite.SQLiteDatabase;import android.database.sqlite.SQLiteOpenHelper;public class DatabaseHelper extends SQLiteOpenHelper {    private static final String DATABASE_NAME = "myDatabase";    private static final int DATABASE_VERSION = 1;    public DatabaseHelper(Context context) {        super(context, DATABASE_NAME, null, DATABASE_VERSION);    }    @Override    public void onCreate(SQLiteDatabase db) {        String sql = "CREATE TABLE myTable (id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT)";        db.execSQL(sql);    }    @Override    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {        String sql = "DROP TABLE IF EXISTS myTable";        db.execSQL(sql);        onCreate(db);    }}

2. 导出数据库

To export the database from an Android device to a file, you can use the following method:

private void exportDatabase(String databaseName) {    try {        File sd = Environment.getExternalStorageDirectory();        File data = Environment.getDataDirectory();        if (sd.canWrite()) {            String currentDBPath = "//data//"+getPackageName()+"//databases//"+databaseName+"";            String backupDBPath = "/yourBackupFolder/"+databaseName+"";            File currentDB = new File(data, currentDBPath);            File backupDB = new File(sd, backupDBPath);            if (currentDB.exists()) {                FileChannel src = new FileInputStream(currentDB).getChannel();                FileChannel dst = new FileOutputStream(backupDB).getChannel();                dst.transferFrom(src, 0, src.size());                src.close();                dst.close();            }        }    } catch (Exception e) {        e.printStackTrace();    }}

注意：此代码需要READ_EXTERNAL_STORAGE和WRITE_EXTERNAL_STORAGE权限。

手机录制音频

1. 开始录音

You need to add the RECORD_AUDIO permission in your app, and you can use the MediaRecorder class to start recording:

MediaRecorder recorder = new MediaRecorder();recorder.setAudioSource(MediaRecorder.AudioSource.MIC);recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);recorder.setOutputFile(audiofile.getAbsolutePath());recorder.prepare();recorder.start();  // Recording starts here

2. 停止录音

When you want to stop recording, you can call the stop() and reset() methods:

recorder.stop();recorder.reset();recorder.release();recorder = null;

注意：这段代码需要在一个新线程中运行，否则可能会阻塞UI线程并导致应用无响应。