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工程目录结构
//BeatBox.java
package com.bignerdranch.android.beatbox;
import android.content.Context;
import android.content.res.AssetFileDescriptor;
import android.content.res.AssetManager;
import android.media.AudioManager;
import android.media.SoundPool;
import android.util.Log;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class BeatBox {
private static final String TAG="BeatBox";
private static final String SOUNDS_FOLDER="sample_sounds";
private static final int MAX_SOUNDS=5;
private AssetManager mAssets;
private List<Sound> mSounds=new ArrayList<>();
private SoundPool mSoundPool;
public BeatBox(Context context){
mAssets=context.getAssets();
mSoundPool=new SoundPool(MAX_SOUNDS, AudioManager.STREAM_MUSIC,0);
loadSounds();
}
public void play(Sound sound){
Integer soundId=sound.getSoundId();
if (soundId==null){
return;
}
mSoundPool.play(soundId,1.0f,1.0f,1,0,1.0f);
}
public void release(){
mSoundPool.release();
}
private void loadSounds(){
String[] soundNames;
try{
soundNames=mAssets.list(SOUNDS_FOLDER);
Log.i(TAG,"Found"+soundNames.length+"sounds");
}catch (IOException ioe){
Log.e(TAG,"Could not list assets",ioe);
return;
}
for (String filename:soundNames){
try{
String assetPath=SOUNDS_FOLDER+"/"+filename;
Sound sound=new Sound(assetPath);
load(sound);
mSounds.add(sound);
}catch (IOException ioe){
Log.e(TAG,"Couldn't load sound "+filename,ioe);
}
}
}
public List<Sound> getSounds(){
return mSounds;
}
private void load(Sound sound)throws IOException{
AssetFileDescriptor afd=mAssets.openFd(sound.getAsserPath());
int soundId=mSoundPool.load(afd,1);
sound.setSoundId(soundId);
}
}
//BeatBoxActivity.java
package com.bignerdranch.android.beatbox;
import android.support.v4.app.Fragment;
public class BeatBoxActivity extends SingleFragmentActivity {
@Override
protected Fragment createFragment(){
return BeatBoxFragment.newInstance();
}
}
//BeatBoxFragment.java
package com.bignerdranch.android.beatbox;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import java.util.List;
public class BeatBoxFragment extends Fragment {
private BeatBox mBeatBox;
public static BeatBoxFragment newInstance(){
return new BeatBoxFragment();
}
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setRetainInstance(true);
mBeatBox=new BeatBox(getActivity());
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
View view=inflater.inflate(R.layout.fragment_beat_box,container,false);
RecyclerView recyclerView=(RecyclerView)view.findViewById(R.id.fragment_beat_box_recycler_view);
recyclerView.setLayoutManager(new GridLayoutManager(getActivity(),3));
recyclerView.setAdapter(new SoundAdapter(mBeatBox.getSounds()));
return view;
}
@Override
public void onDestroy(){
super.onDestroy();
mBeatBox.release();
}
private class SoundHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
private Button mButton;
private Sound mSound;
public SoundHolder(LayoutInflater inflater,ViewGroup container){
super(inflater.inflate(R.layout.list_item_sound,container,false));
mButton=(Button)itemView.findViewById(R.id.list_item_sound_botton);
mButton.setOnClickListener(this);
}
public void bindSound(Sound sound){
mSound=sound;
mButton.setText(mSound.getName());
}
@Override
public void onClick(View v){
mBeatBox.play(mSound);
}
}
private class SoundAdapter extends RecyclerView.Adapter<SoundHolder>{
private List<Sound> mSounds;
public SoundAdapter(List<Sound> sounds){
mSounds=sounds;
}
@Override
public SoundHolder onCreateViewHolder(ViewGroup parent,int viewType){
LayoutInflater inflater=LayoutInflater.from(getActivity());
return new SoundHolder(inflater,parent);
}
@Override
public void onBindViewHolder(SoundHolder soundHolder,int position){
Sound sound=mSounds.get(position);
soundHolder.bindSound(sound);
}
@Override
public int getItemCount(){
return mSounds.size();
}
}
}
//SingleFragmentActivity.java
package com.bignerdranch.android.beatbox;
import android.os.Bundle;
import android.support.annotation.LayoutRes;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v7.app.AppCompatActivity;
public abstract class SingleFragmentActivity extends AppCompatActivity{
protected abstract Fragment createFragment();
@LayoutRes
protected int getLayoutResId(){
return R.layout.activity_fragment;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(getLayoutResId());
FragmentManager fm=getSupportFragmentManager();
Fragment fragment=fm.findFragmentById(R.id.fragment_container);
if(fragment==null){
fragment=createFragment();
fm.beginTransaction().add(R.id.fragment_container,fragment).commit();
}
}
}
//Sound.java
package com.bignerdranch.android.beatbox;
public class Sound {
private String mAssetPath;
private String mName;
private Integer mSoundId;
public Sound(String assetPath){
mAssetPath=assetPath;
String[] components=assetPath.split("/");
String filename=components[components.length-1];
mName=filename.replace(".wav","");
}
public String getAsserPath(){
return mAssetPath;
}
public String getName(){
return mName;
}
public Integer getSoundId(){
return mSoundId;
}
public void setSoundId(Integer soundId){
mSoundId=soundId;
}
}
<!-- activity_fragment.xml-->
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
<!-- fragment_beat_box.xml-->
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.RecyclerView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/fragment_beat_box_recycler_view"
/>
<!-- list_item_sound.xml-->
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_margin="8dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:layout_width="100dp"
android:layout_height="100dp"
android:id="@+id/list_item_sound_botton"
android:layout_gravity="center"
tools:text="Sound name"/>
</FrameLayout>
<!-- colors.xml-->
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="colorPrimary">#3F51B5</color>
<color name="colorPrimaryDark">#303F9F</color>
<color name="colorAccent">#FF4081</color>
<color name="red">#F44336</color>
<color name="dark_red">#C3352B</color>
<color name="gray">#607D8B</color>
<color name="soothing_blue">#0083BF</color>
<color name="dark_blue">#005A8A</color>
</resources>
<!-- styles.xml-->
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/red</item>
<item name="colorPrimaryDark">@color/dark_red</item>
<item name="colorAccent">@color/gray</item>
<item name="android:colorBackground">@color/soothing_blue</item>
<item name="android:buttonStyle">@style/BeatBoxButton</item>
</style>
<style name="BeatBoxButton" parent="android:style/Widget.Holo.Button">
<item name="android:background">@drawable/button_beat_box</item>
</style>
</resources>
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