java - 关于 Android TV 中的 EPG 数据

Question

我现在正在为 android TV 创建一个 EPG 应用程序，因此我需要访问存储在“/data/data/com.android.providers.tv/databases/tv.db”中的 channel 数据。我尝试制作一个数据库助手，这是代码:

包com.example.test;

import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * Created by Ahmed on 18/07/2017.
 */

public class DatabaseHelper extends SQLiteOpenHelper {

    String DB_PATH=null;
    private static String DB_NAME="tvls -";
    private SQLiteDatabase myDataBase;
    private final Context myContext;


    public DatabaseHelper(Context context) {
        super(context, DB_NAME, null   , 10);
        this.myContext=context;
        this.DB_PATH="/data/data/com.android.providers.tv/databases";
        Log.e("Path 1",DB_PATH);
    }
    public void createDataBase() throws IOException{
        boolean dbExist = checkDataBase();
        Log.i("Database Existe ?",""+dbExist);
        if (dbExist){

        }else{
            this.getReadableDatabase();
            try {
                copyDataBase();
            } catch (Exception e ) {
                throw new Error("Error coying database");
            }
        }
    }

    private void copyDataBase() throws IOException {
        InputStream myInput = myContext.getAssets().open(DB_NAME);
        String outFileName = DB_PATH + DB_NAME;
        OutputStream myOutput = new FileOutputStream(outFileName);
        byte[] buffer = new byte[10];
        int length;
        while ((length=myInput.read(buffer))>0){
            myOutput.write(buffer,0,length);

        }
        myOutput.flush();
        myOutput.close();
        myInput.close();
    }

    private boolean checkDataBase() {
        SQLiteDatabase checkDB = null;
        try{
            String myPath= DB_PATH + DB_NAME;
            checkDB = SQLiteDatabase.openDatabase(myPath,null,SQLiteDatabase.OPEN_READONLY);

        }catch (SQLiteException e){
            e.printStackTrace();
        }
        if (checkDB !=null){
            checkDB.close();
        }
        return checkDB != null ? true : false;


    }
public void openDataBase() throws SQLException{
    String myPath= DB_PATH + DB_NAME;
    myDataBase = SQLiteDatabase.openDatabase(myPath,null,SQLiteDatabase.OPEN_READONLY);

}

    @Override
    public synchronized void close() {
        if(myDataBase!=null)
            myDataBase.close();
        super.close();
    }

    @Override
    public void onCreate(SQLiteDatabase db) {}

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        if (newVersion > oldVersion)
            try {
                copyDataBase();
            } catch (IOException e) {
                e.printStackTrace();

            }
    }
    public Cursor query(String table, String[] columns, String selection, String[] selectionArgs, String groupBy, String having, String orderBy) {
        return myDataBase.query("channels", null, null, null, null, null, null);
    }
}

但它没有连接到 tv.db 并抛出此错误:

07-18 23:16:01.970 5361-5361/com.example.test E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.test, PID: 5361 java.lang.Error: Error coying database at com.example.test.DatabaseHelper.createDataBase(DatabaseHelper.java:44) at com.example.test.MainActivity.onCreate(MainActivity.java:46) at android.app.Activity.performCreate(Activity.java:6237) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) at android.app.ActivityThread.-wrap11(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

PS:如果有任何有关如何使用 TvProvider 的信息，请帮助我，我被困住了。我需要做的就是阅读 channel 列表及其节目列表。

Answer 1

我找到了这个问题的答案: 您需要通过抛出一个 contentResolver 来获取数据并将结果查询存储在游标中。

cursor = mContext.getContentResolver().query(TvContractCompat.Channels.CONTENT_URI,
                Channel.PROJECTION,
                null,
                null,
                null);
 if (cursor != null && cursor.moveToFirst()) {
                Log.i(TAG,cursor.getCount()+"Chaines ont étaient mise à jour avec Succés");
                do {
                    channels.add(Channel.fromCursor(cursor));

                }while (cursor.moveToNext());

然后，为了访问 epg 数据，您需要将这些行放入 list 中:

   <uses-permission android:name="com.android.providers.tv.permission.READ_EPG_DATA" />

    <uses-permission android:name="com.android.providers.tv.permission.WRITE_EPG_DATA" />

    <uses-permission android:name="com.android.providers.tv.permission.ACCESS_ALL_EPG_DATA"/>

如果您将应用程序安装为用户应用程序，则应用程序将仅获取它创建的 epg 数据，因此为了获取电视中的所有 epg 数据，您需要将其作为系统应用程序安装在/system/priv-app 文件夹中。