我创建了一个已经运行的应用程序，该应用程序显示ListView项，并且在选择列表中的项时，它会打开新活动。在new_activity内部，我有TextView和Image按钮，显示播放，暂停和停止的音频按钮。 TextView可以正常运行，但是图像按钮拒绝播放原始文件夹中的音频文件。我的原始文件夹中有很多音频文件，并希望将每个音频文件分配给将打开每个新活动的每个ListView。请帮我编辑下面的ListViewAdapter代码，以播放，暂停和停止播放每个音频文件。
ListViewAdapter.java
public class ListViewAdapter extends BaseAdapter{
//Variables
Context mContext;
LayoutInflater inflater;
List<Model> modellist;
ArrayList<Model> arrayList;
MediaPlayer Player;
//Constructor
public ListViewAdapter(Context context, List<Model> modellist) {
mContext = context;
this.modellist = modellist;
inflater = LayoutInflater.from(mContext);
this.arrayList = new ArrayList<Model>();
this.arrayList.addAll(modellist);
}
public class ViewHolder{
TextView mTitleTv, mDescTv;
ImageView mIconTv;
}
@Override
public int getCount() {
return modellist.size();
}
@Override
public Object getItem(int i) {
return modellist.get(i);
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public View getView(final int i, View view, ViewGroup parent) {
final ViewHolder holder;
if (view==null){
holder = new ViewHolder();
view = inflater.inflate(R.layout.row, null);
//locate the views in row.xml
holder.mTitleTv = (TextView) view.findViewById(R.id.mainTitle);
holder.mDescTv = (TextView) view.findViewById(R.id.mainDesc);
holder.mIconTv = view.findViewById(R.id.mainIcon);
view.setTag(holder);
}
else {
holder = (ViewHolder)view.getTag();
}
//set the result into textview
holder.mTitleTv.setText(modellist.get(i).getTitle());
holder.mDescTv.setText(modellist.get(i).getDesc());
//Set the result in imagview
holder.mIconTv.setImageResource(modellist.get(i).getIcon());
//listview item clicks
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//code later
if (modellist.get(i).getTitle().equals("Item 1| information central for ANSPP")){
//start NewActivity with title for actionbar and text for textview
Intent intent = new Intent(mContext, NewActivity.class);
intent.putExtra("actionBarTitle", "Item 3");
intent.putExtra("contentTv", "This is the text for information central of all ANSPP");
mContext.startActivity(intent);
}
if (modellist.get(i).getTitle().equals("Item 2| information central for ANSPP")){
//start NewActivity with title for actionbar and text for textview
Intent intent = new Intent(mContext, NewActivity.class);
intent.putExtra("actionBarTitle", "Item 3");
intent.putExtra("contentTv", "This is the text for information central of all ANSPP");
mContext.startActivity(intent);
}
if (modellist.get(i).getTitle().equals("Item 3| information central for ANSPP")){
//start NewActivity with title for actionbar and text for textview
Intent intent = new Intent(mContext, NewActivity.class);
intent.putExtra("actionBarTitle", "Item 3");
intent.putExtra("contentTv", "This is the text for information central of all ANSPP");
mContext.startActivity(intent);
}
}
});
return view;
}
//filter
public void filter(String charText){
charText = charText.toLowerCase(Locale.getDefault());
modellist.clear();
if (charText.length()==0){
modellist.addAll(arrayList);
}
else {
for (Model model : arrayList){
if (model.getTitle().toLowerCase(Locale.getDefault()).contains(charText)){
modellist.add(model);
}
}
}
notifyDataSetChanged();
}
}
新的Activity.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:ads="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:layout_marginTop="5dp"
tools:context=".NewActivity">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Play Audio music →"
android:layout_marginStart="10dp"
android:textColor="#8c0b0b"
android:layout_marginLeft="10dp" />
</LinearLayout>
<ImageView
android:id="@+id/img1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:onClick="play"
android:layout_marginStart="140dp"
android:src="@drawable/ic_play_circle_outline_black_24dp"
android:layout_marginLeft="5dp" />
<ImageView
android:id="@+id/img2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentTop="true"
android:layout_marginEnd="145dp"
android:onClick="pause"
android:src="@drawable/ic_pause_circle_outline_black_24dp"
android:layout_alignParentRight="true"
android:layout_marginRight="145dp" />
<ImageView
android:id="@+id/img3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentTop="true"
android:layout_marginEnd="85dp"
android:onClick="stop"
android:src="@drawable/ic_stop_black_24dp"
android:layout_alignParentRight="true"
android:layout_marginRight="85dp" />
<ScrollView
android:layout_width="340dp"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="30dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/textView"
android:layout_width="336dp"
android:layout_height="fill_parent"
android:enabled="true"
android:focusable="true"
android:fontFamily="sans-serif-condensed"
android:text="Details later..."
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#000"
android:textIsSelectable="true"
android:textSize="21sp" />
</LinearLayout>
</ScrollView>
</RelativeLayout>
下面列出了NewActivity.java。此活动中的MediaPlayer在所有列表视图中播放一首歌曲。我想在ListViewAdapter.java中实现此代码，以便为每个ListView内容分配每个音频文件。谢谢
NewActivity.java
public class NewActivity extends AppCompatActivity {
private String TAG = "NewActivity ----- ; " ;
// Store instance variables
private String title;
private int page;
MediaPlayer player;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_new);
ActionBar actionBar = getSupportActionBar();
TextView mDetailTv = findViewById(R.id.textView);
//get data from previous activity when item of activity is clicked using intent
Intent intent = getIntent();
String mActionBarTitle = intent.getStringExtra("actionBarTitle");
String mContent = intent.getStringExtra("contentTv");
//setctionBar Title
actionBar.setTitle(mActionBarTitle);
//get text in text textView
mDetailTv.setText(mContent);
//ok we are done,
public void play(View v) {
if (player == null) {
player = MediaPlayer.create(this, R.raw.song_1);
Toast.makeText(this, "Tune Playing", Toast.LENGTH_SHORT ).show();
player.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
stopPlayer();
}
});
}
player.start();
}
public void pause(View v) {
if (player != null) {
player.pause();
Toast.makeText(this, "Tune Paused", Toast.LENGTH_SHORT ).show();
}
}
public void stop(View v) {
stopPlayer();
}
private void stopPlayer() {
if (player != null) {
player.release();
player = null;
Toast.makeText(this, "Tune Stoped", Toast.LENGTH_SHORT ).show();
}
}
@Override
protected void onStop() {
super.onStop();
stopPlayer();
}
}
答案 0 :(得分：0)
@Merinze
我将逐步解释如果我所有的音频文件都位于 res 文件夹下的 raw 文件夹中，该如何实现。
首先创建您的项目，然后按所需方式命名。进入项目文件夹并导航 app-> src-> main-> res ，然后在其中创建一个名为 raw 的新文件夹。将所有音频放在此处，并记住有一些有关资源命名的规则。
查看链接：Android resource naming convention
创建您的项目主要活动，您将在其中检索音频并将其列出在MainActivity的ListView中。
MainActivity的XML：
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context=".MainActivity"
tools:showIn="@layout/activity_main">
<ListView
android:id="@+id/list_data"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="15dp" />
</android.support.design.widget.CoordinatorLayout>
MainActivity的JAVA：
public class MainActivity extends AppCompatActivity {
private ListView listView;
private ListAdapter listAdapter;
private List<AudioModel> audioModelList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
//instantiate the list object
audioModelList=new ArrayList<>();
listView=(ListView)findViewById(R.id.list_data);
listAdapter = new ListAdapter(audioModelList,getApplicationContext());
listView.setAdapter(listAdapter);
/*retrieve raw files and add them to the list by calling this method declared at the end of class*/
listRaw();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
//define a method to fetch all files under your raw folder
public void listRaw(){
Field[] fields=R.raw.class.getFields();
for(int count=0; count < fields.length; count++){
Log.i("Raw Asset: ", fields[count].getName());
/*create a new AudioModel object this is just a class name you can choose your own*/
AudioModel audioModel=new AudioModel();
audioModel.setName(fields[count].getName());
//app the object to the list
audioModelList.add(audioModel);
}
//notify the adapter
listAdapter.notifyDataSetChanged();
}
}
在AudioModel类文件下：
public class AudioModel {
private String name,creationDate,singer;
public AudioModel() {
}
public AudioModel(String name, String creationDate, String singer) {
this.name = name;
this.creationDate = creationDate;
this.singer = singer;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getCreationDate() {
return creationDate;
}
public void setCreationDate(String creationDate) {
this.creationDate = creationDate;
}
public String getSinger() {
return singer;
}
public void setSinger(String singer) {
this.singer = singer;
}
}
为列表项创建新布局：
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/audio"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="15dp">
</TextView>
创建一个列表适配器：
public class ListAdapter extends BaseAdapter {
private List<AudioModel> audioModelList;
private Context context;
public ListAdapter(List<AudioModel> audioModelList, Context context) {
this.audioModelList = audioModelList;
this.context = context;
}
@Override
public int getCount() {
return audioModelList!=null?audioModelList.size():0;
}
@Override
public Object getItem(int position) {
return audioModelList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
convertView= LayoutInflater.from(context).inflate(R.layout.item_layout,parent,false);
TextView audioName=(TextView)convertView.findViewById(R.id.audio);
audioName.setText(audioModelList.get(position).getName());
convertView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
context.startActivity(new Intent(v.getContext(),AudioModelPlayer.class).putExtra("actionBarTitle",audioModelList.get(position).getName()));
}
});
return convertView;
}
}
创建您的音频播放器课程：
public class AudioModelPlayer extends AppCompatActivity {
private MediaPlayer mediaPlayer;
private FloatingActionButton play,pause;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_audio_model_player);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
play=(FloatingActionButton)findViewById(R.id.play);
pause=(FloatingActionButton)findViewById(R.id.pause);
play.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mediaPlayer!=null)
{
mediaPlayer.start();
}
pause.setVisibility(View.VISIBLE);
play.setVisibility(View.GONE);
}
});
pause.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mediaPlayer!=null)
{
mediaPlayer.pause();
}
play.setVisibility(View.VISIBLE);
pause.setVisibility(View.GONE);
}
});
mediaPlayer=new MediaPlayer();
Intent intent=getIntent();
if (intent!=null)
{
if (intent.hasExtra("actionBarTitle"))
{
setTitle(intent.getStringExtra("actionBarTitle"));
mediaPlayer=MediaPlayer.create(getApplicationContext(),getResources().getIdentifier(intent.getStringExtra("actionBarTitle"),"raw",getPackageName()));
}
}else
{
finish();
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if(item.getItemId()==android.R.id.home)
{
if (mediaPlayer!=null)
{
if(mediaPlayer.isPlaying())
{
mediaPlayer.stop();
mediaPlayer.release();
}else
{
mediaPlayer.release();
}
}
}
finish();
return super.onOptionsItemSelected(item);
}
}
这只是一个示例，您可以参考此文件来制作自己的应用程序，或者使其变得更好。此方法可用于位于其他任何地方的文件，但访问/读取文件的方式会有所不同。
您可以从GitHub AudioListProject
下载整个项目