如何解决离线获取json文件
使用 var data = require('../file.json'); 我可以很容易地获取数据，
但是 - 网络浏览器不支持 require.js，因此我无法使用它。
我看到 fetch.js 提供了我需要的相同功能（我只想将 json 文件中的数据作为一个对象），但是如果它不是在线托管的，我就无法使用它，我不知道如何设置本地主机服务器。
有人可以为这样的问题提供解决方案吗？是否有另一种方法可以像我想要的那样“客观化”json 文件中的数据？
解决方法
可以使用public class Musicplay extends AppCompatActivity implements View.OnClickListener {
Button play,next,previous;
TextView songmar;
SeekBar seekBar;
MediaPlayer mediaPlayer;
int position,idr;
Handler handler=new Handler();
Handler vindler=new Handler();
Uri uri;
int max;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.playdisplay);
Intent i=getIntent();
position=i.getIntExtra("position",0);
play=findViewById(R.id.pause);
next=findViewById(R.id.next);
previous=findViewById(R.id.previous);
songmar=findViewById(R.id.songnamemar);
songmar.setSelected(true);
songmar.setText(Musiclist.songname.get(position));
seekBar=findViewById(R.id.seekBar);
if(mediaPlayer==null)
{
Log.d("null","null");
}
else {
if(mediaPlayer.isPlaying())
{
mediaPlayer.stop();
mediaPlayer.release();
}
else {
mediaPlayer.release();
}
}
uri=Uri.parse(String.valueOf(new File(Musiclist.songpath.get(position))));
mediaPlayer=MediaPlayer.create(Musicplay.this,uri);
seekBar.setMax(mediaPlayer.getDuration());
mediaPlayer.start();
max=mediaPlayer.getDuration();
play.setBackgroundResource(R.drawable.ic_pause);
Thread thread=new Thread(){
@Override
public void run() {
super.run();
int currentposition=0;
while (currentposition<max)
{
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
currentposition=mediaPlayer.getCurrentPosition();
seekBar.setProgress(currentposition);
}
}
};
thread.start();
seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar,int progress,boolean fromUser) {
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
mediaPlayer.seekTo(seekBar.getProgress());
}
});
next.setOnClickListener(Musicplay.this);
play.setOnClickListener(Musicplay.this);
previous.setOnClickListener(Musicplay.this);
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
mp.stop();
mp.reset();
if(position<(Musiclist.songname.size()-1)){
position=position +1;
}
else
{
position=0;
}
uri = Uri.parse(String.valueOf(new File(Musiclist.songpath.get(position))));
try {
mp.setDataSource(Musicplay.this,uri);
} catch (IOException e) {
e.printStackTrace();
}
songmar.setText(Musiclist.songname.get(position));
songmar.setSelected(true);
try {
mp.prepare();
} catch (IOException e) {
e.printStackTrace();
}
}
});
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mp.start();
seekBar.setMax(mp.getDuration());
max=mp.getDuration();
Log.d("seekvalue",String.valueOf(max));
}
});
}
@Override
public void onClick(View v) {
idr=v.getId();
Thread thread2=new Thread(){
@Override
public void run() {
super.run();
handler.post(new Runnable() {
@Override
public void run() {
switch (idr){
case R.id.pause:
if(mediaPlayer.isPlaying()){
mediaPlayer.pause();
play.setBackgroundResource(R.drawable.ic_play);
}
else {
play.setBackgroundResource(R.drawable.ic_pause);
mediaPlayer.start();
}
break;
case R.id.next:
mediaPlayer.stop();
mediaPlayer.reset();
if(position<(Musiclist.songname.size()-1)){
position=position +1;
Uri uri=Uri.parse(String.valueOf(new File(Musiclist.songpath.get(position))));
try {
mediaPlayer.setDataSource(Musicplay.this,uri);
} catch (IOException e) {
e.printStackTrace();
}
int a=0;
for(int i=0;i<150;i++)
{
a=a+1;
}
try {
mediaPlayer.prepare();
} catch (IOException e) {
e.printStackTrace();
}
play.setBackgroundResource(R.drawable.ic_pause);
songmar.setText(Musiclist.songname.get(position));
songmar.setSelected(true);
}
else {
position=0;
Uri uri=Uri.parse(String.valueOf(new File(Musiclist.songpath.get(position))));
try {
mediaPlayer.setDataSource(Musicplay.this,uri);
} catch (IOException e) {
e.printStackTrace();
}
int a=0;
for(int i=0;i<150;i++)
{
a=a+1;
}
try {
mediaPlayer.prepare();
} catch (IOException e) {
e.printStackTrace();
}
play.setBackgroundResource(R.drawable.ic_pause);
songmar.setText(Musiclist.songname.get(position));
songmar.setSelected(true);
}
break;
case R.id.previous:
mediaPlayer.stop();
mediaPlayer.reset();
if(position>0){
position=position-1;
Uri uri=Uri.parse(String.valueOf(new File(Musiclist.songpath.get(position))));
try {
mediaPlayer.setDataSource(Musicplay.this,uri);
} catch (IOException e) {
e.printStackTrace();
}
int a=0;
for(int i=0;i<150;i++)
{
a=a+1;
}
try {
mediaPlayer.prepare();
} catch (IOException e) {
e.printStackTrace();
}
play.setBackgroundResource(R.drawable.ic_pause);
songmar.setText(Musiclist.songname.get(position));
songmar.setSelected(true);
}
else {
position=Musiclist.songname.size()-1;
Uri uri=Uri.parse(String.valueOf(new File(Musiclist.songpath.get(position))));
try {
mediaPlayer.setDataSource(Musicplay.this,uri);
} catch (IOException e) {
e.printStackTrace();
}
int a=0;
for(int i=0;i<150;i++)
{
a=a+1;
}
try {
mediaPlayer.prepare();
} catch (IOException e) {
e.printStackTrace();
}
play.setBackgroundResource(R.drawable.ic_pause);
songmar.setText(Musiclist.songname.get(position));
songmar.setSelected(true);
}
break;
}
}
});
}
};
thread2.start();
}
}
获取json格式的数据。
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