android学习笔记39——使用原始资源

布局文件==》
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    android:orientation="horizontal"
    tools:context=".MainActivity" >

    <Button
        android:id="@+id/btnRaw"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="raw" />

    <Button
        android:id="@+id/btnAssets"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="assets" />
    
     <Button
        android:id="@+id/btnStop"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="stop" />

</LinearLayout>

代码实现==》
package com.example.myoriginalresources;

import java.io.IOException;

import android.media.MediaPlayer;
import android.os.Bundle;
import android.app.Activity;
import android.content.res.AssetFileDescriptor;
import android.content.res.AssetManager;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity
{
	MediaPlayer mediaRaw = null;
	MediaPlayer mediaAssets = null;

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

		mediaRaw = MediaPlayer.create(this, R.raw.rawq);
		AssetManager am = getAssets();
		try
		{
			// 获取指定文件对应的AssetFileDescriptor
			AssetFileDescriptor afd = am.openFd("assets.mp3");
			mediaAssets = new MediaPlayer();
			// 使用MediaPlayer加载指定的mp3文件
			mediaAssets.setDataSource(afd.getFileDescriptor());
			mediaAssets.prepare();
		} catch (IOException e)
		{
			e.printStackTrace();
		}

		Button btnRaw = (Button) this.findViewById(R.id.btnRaw);
		Button btnAssets = (Button) this.findViewById(R.id.btnAssets);
		Button btnStop = (Button) this.findViewById(R.id.btnStop);
		
		btnRaw.setOnClickListener(new buttonClick());
		btnAssets.setOnClickListener(new buttonClick());
		btnStop.setOnClickListener(new buttonClick());
	}

	class buttonClick implements OnClickListener
	{
		@Override
		public void onClick(View v)
		{
			switch (v.getId())
			{
			case R.id.btnRaw:
				mediaRaw.start();
				break;
			case R.id.btnAssets:
				mediaAssets.start();
				break;
			case R.id.btnStop:
				mediaAssets.stop();
				mediaRaw.stop();
				finish();
				break;
			}
		}
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu)
	{
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}