res/raw文件的存放和讀取

通常，如果Android開發者有些文件比如音頻，視頻，.html，.mp3等等這些文件不希望編譯器編譯而保持原始原貌打包進apk文件（這在游戲開發中很常見和普遍，如游戲用到的游戲音樂、圖等資源），那么可以使用Android在res目錄下的res/raw保存。res/raws目錄下的文件將不被Android編譯成二進制，Android將這些文件資源保持原狀原封不動的打包進最終編譯發布時候的apk文件。

怎樣讀取raw文件：

package com.zzw.testraw;

import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;

public class MainActivity extends Activity {

    private static final String TAG = "MainActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // setContentView(R.layout.activity_main);

        readRaw();
    }

    private void readRaw() {
        InputStream is = getResources().openRawResource(R.raw.hello);

        try {
            byte[] data = readByteDataFromInputStream(is);
            String content = new String(data, 0, data.length, "UTF-8");
            Log.d(TAG, content);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    private byte[] readByteDataFromInputStream(InputStream is) throws IOException {
        BufferedInputStream bis = new BufferedInputStream(is);

        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        final int BUFFER_SIZE = 2 * 1024;

        int c = 0;
        byte[] buffer = new byte[BUFFER_SIZE];

        // 寫成baos.write(buffer, 0, c)的原因是讀多少寫多少
        while ((c = bis.read(buffer)) != -1) {
            baos.write(buffer, 0, c);
            baos.flush();
        }

        byte[] data = baos.toByteArray();
        baos.flush();

        baos.close();
        is.close();

        return data;

    }
}