Activity01.java

package com.yarin.android.Examples_06_02;

import java.io.*;
import java.util.Properties;

import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.os.Bundle;
import android.view.KeyEvent;
import android.widget.TextView;

public class Activity01 extends Activity {

    private MIDIPlayer mMIDIPlayer = null;
    private boolean mbMusic = false;
    private TextView mTextView = null;

    /**
     * Called when the activity is first created.
     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mTextView = (TextView) this.findViewById(R.id.TextView01);

        mMIDIPlayer = new MIDIPlayer(this);

        /* ��ȡ�ļ�����  */
        load();
//        loadText();
        if (mbMusic) {
            mTextView.setText("��ǰ����״̬����");
            mbMusic = true;
            mMIDIPlayer.PlayMusic();
        } else {
            mTextView.setText("��ǰ����״̬����");
        }

    }

    private void loadText() {
        InputStream is = Resources.getSystem().openRawResource(R.raw.text);
        int len = -1;
        try {
            byte[] buf = new byte[is.available()];
            is.read(buf, 0, buf.length);
            ((TextView) findViewById(R.id.greeting)).setText(new String(buf, "UTF-8"));
        } catch (IOException e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        }

    }

    public boolean onKeyUp(int keyCode, KeyEvent event) {
        switch (keyCode) {
            case KeyEvent.KEYCODE_DPAD_UP:
                mTextView.setText("��ǰ����״̬����");
                mbMusic = true;
                mMIDIPlayer.PlayMusic();
                break;
            case KeyEvent.KEYCODE_DPAD_DOWN:
                mTextView.setText("��ǰ����״̬����");
                mbMusic = false;
                mMIDIPlayer.FreeMusic();
                break;
        }
        return true;
    }

    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            /* �˳�Ӧ�ó���ʱ�������� */
            save();

            if (mbMusic) {
                mMIDIPlayer.FreeMusic();
            }
            this.finish();
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

    /* װ�ء���ȡ���� */
    void load() {
        /* ����Properties�Զ��� */
        Properties properties = new Properties();
        try {
            /* �����ļ� */
            FileInputStream stream = this.openFileInput("music.cfg");
            /* ��ȡ�ļ����� */
            properties.load(stream);
        } catch (FileNotFoundException e) {
            return;
        } catch (IOException e) {
            return;
        }
        /* ȡ������ */
        mbMusic = Boolean.valueOf(properties.get("bmusic").toString());
    }

    /* �������� */
    boolean save() {
        Properties properties = new Properties();

        /* �����ݴ����Properties */
        properties.put("bmusic", String.valueOf(mbMusic));
        try {
            FileOutputStream stream = this.openFileOutput("music.cfg", Context.MODE_WORLD_WRITEABLE);

            /* ������õ�����д���ļ��� */
            properties.store(stream, "");
        } catch (FileNotFoundException e) {
            return false;
        } catch (IOException e) {
            return false;
        }

        return true;
    }
}