我正在创建一个Android应用程序，其中我想在后台输入时钟滴答声，这也是最后几秒钟。
音频是21秒，我也希望它能在定时器的最后21秒播放。实际计时器运行2分钟。
我正在尝试以下代码：
public void onTick(long millisUntilFinished) {
// TODO Auto-generated method stub
millis = millisUntilFinished;
if(millis == 21000){
mp1.start();
}
hms = String.format("%02d:%02d",
TimeUnit.MILLISECONDS.toMinutes(millis) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millis)),
TimeUnit.MILLISECONDS.toSeconds(millis) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis)));
timer.setText(hms);
}
其中mp1是：
mp1 = MediaPlayer.create(AnimalMain.this,R.raw.tick_tock);
但是没有任何东西被播放。另外，我在log cat中收到错误：
should have subtitle controller already set
我尝试了许多具有相同问题的stackoverflow链接，但无法使用它们解决它。请帮助。
如需任何参考，请在此处查看完整代码：
package com.example.jumboquest;
import android.app.Activity;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.CountDownTimer;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.concurrent.TimeUnit;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ToggleButton;
import android.media.MediaPlayer;
public class AnimalMain extends Activity {
TextView timer, roundStatus;
ListView jum;
ProgressBar prog;
EditText ans;
ToggleButton pause;
String s,hms,hmso;
int[] a;
Button next;
static long millis;
static CountDownTimer t;
long toggleValue;
String[] s1 = new String[4];
static ArrayList<String> words;
static ArrayAdapter<String> aa;
static int progressStatus = 0;
//Button match;
static long resumeTsp;
static boolean phoneRinging = false;
static int scorekeeper;
static int rnd_counter;
boolean bonus = false;
long bonus_millis = 0;
MediaPlayer mp1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
rnd_counter++;
setContentView(R.layout.screen2);
resumeTsp = 120000;
jum = (ListView)findViewById(R.id.jum);
ans = (EditText)findViewById(R.id.ans);
timer = (TextView)findViewById(R.id.timer);
roundStatus = (TextView)findViewById(R.id.desc);
prog = (ProgressBar)findViewById(R.id.prog);
//match = (Button) findViewById(R.id.button1);
mp1 = MediaPlayer.create(AnimalMain.this,R.raw.tick_tock);
roundStatus.setText("Round:" +rnd_counter);
Intent intnt = getIntent();
progressStatus = intnt.getIntExtra("prog", 0);
new Thread(new Runnable(){
public void run(){
prog.setProgress(progressStatus);
try{
Thread.sleep(5000);
}
catch(Exception e){
e.printStackTrace();
}
}
}).start();
// Create the array list of to do items
words = new ArrayList<String>();
// Create the array adapter to bind the array to the listview
aa = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,words);
// Bind the array adapter to the listview.
jum.setAdapter(aa);
InputStream i = this.getResources().openRawResource(R.raw.first_round);
String line = null;
int currentLineNo = 1;
int min = 1;
int max = 49;
int startLine = 0;
int endLine = 0;
Random rand = new Random();
switch(rnd_counter){
case 1:
min = 1;
max = 28;
break;
case 2:
min = 32;
max = 59;
break;
case 3:
min = 63;
max = 92;
break;
}
int r = rand.nextInt((max - min) + 1) + min;
startLine = r;
endLine = r+3;
BufferedReader in = null;
try {
in = new BufferedReader (new InputStreamReader(i));
//read to startLine
while(currentLineNo<startLine) {
if (in.readLine()==null) {
// oops, early end of file
throw new IOException("File too small");
}
++currentLineNo;
}
int i1=0;
//read until endLine
while(currentLineNo<=endLine) {
line = in.readLine();
if (line==null) {
// here, we'll forgive a short file
// note finally still cleans up
return;
}
s1[i1]=line;
//= new StringBuffer(line).reverse().toString();
List<Character> jumble = new ArrayList<Character>();
StringBuilder sample = new StringBuilder(line.length());
for(char c : line.toCharArray()){
jumble.add(c);
}
//int flag_first = 0;
while(jumble.size() != 0){
int rnd = (int)(Math.random()*jumble.size());
if(rnd == 0 && jumble.size() == line.length()){
continue;
}
else{
sample.append(jumble.remove(rnd));
}
}
words.add(sample.toString());
aa.notifyDataSetChanged();
++i1;
++currentLineNo;
}
} catch (IOException ex) {
System.out.println("Problem reading file.\n" + ex.getMessage());
} finally {
try { if (in!=null) in.close(); } catch(IOException ignore) {}
}
a = new int[4];
a[0] = 0;
a[1] = 0;
a[2] = 0;
a[3] = 0;
/* match.setOnClickListener(new OnClickListener(){
public void onClick(View v){
String answer = ans.getText().toString();
if(answer.equalsIgnoreCase(s1[0])){
words.remove(0);
aa.notifyDataSetChanged();
words.add(0,answer);
aa.notifyDataSetChanged();
}
else if(answer.equalsIgnoreCase(s1[1])){
words.remove(1);
aa.notifyDataSetChanged();
words.add(1,answer);
aa.notifyDataSetChanged();
}
else if(answer.equalsIgnoreCase(s1[2])){
words.remove(2);
aa.notifyDataSetChanged();
words.add(2,answer);
aa.notifyDataSetChanged();
}
else if(answer.equalsIgnoreCase(s1[3])){
words.remove(3);
aa.notifyDataSetChanged();
words.add(3,answer);
aa.notifyDataSetChanged();
}
}
});*/
jum.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
String selected = jum.getItemAtPosition(arg2).toString();
s= ans.getText().toString();
if(s.equals(s1[arg2]))
{
a[arg2]=1;
//Toast.makeText(getApplicationContext(), "CORRECT!! Now Crack the Next One.. :) ", Toast.LENGTH_SHORT).show();
words.remove(arg2);
aa.notifyDataSetChanged();
words.add(arg2,s);
aa.notifyDataSetChanged();
arg1.setEnabled(false);
ans.setText("");
if(a[0]==1 && a[1]==1 && a[2]==1 && a[3]==1)
{
t.cancel();
if(millis >= 60000){
bonus = true;
bonus_millis = (millis/1000)-60;
}
//scorekeeper += 40;
Intent i=new Intent(getApplicationContext(), AnimalDatabase.class);
i.putExtra("milli", millis);
i.putExtra("score", scorekeeper);
i.putExtra("bonus", bonus);
i.putExtra("round", rnd_counter);
i.putExtra("bonus_score",bonus_millis);
//i.putExtra("progress",progressStatus);
i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
//Toast.makeText(getApplicationContext(), "WELL DONE!! All the best for the quiz :) ", Toast.LENGTH_LONG).show();
// finish();
}
}
else
{
ans.setText(s);
Toast.makeText(getApplicationContext(), "INCORRECT :( Try Again.. ", Toast.LENGTH_SHORT).show();
}
}
});
TelephonyManager telephonyManager =
(TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
PhoneStateListener callStateListener = new PhoneStateListener() {
public void onCallStateChanged(int state, String incomingNumber)
{
if(state==TelephonyManager.CALL_STATE_RINGING){
resumeTsp = millis;
t.cancel();
timer.setText("Game Paused!");
Toast.makeText(getApplicationContext(),"Phone Is Riging",
Toast.LENGTH_LONG).show();
}
if(state==TelephonyManager.CALL_STATE_OFFHOOK){
Toast.makeText(getApplicationContext(),"Phone is Currently in A call",
Toast.LENGTH_LONG).show();
}
if(state==TelephonyManager.CALL_STATE_IDLE){
t = new StartTimer(resumeTsp,1000);
t.start();
}
}
};
telephonyManager.listen(callStateListener,PhoneStateListener.LISTEN_CALL_STATE);
}
@Override
public void onBackPressed(){
return;
}
class StartTimer extends CountDownTimer{
public StartTimer(long duration, long interval){
super(duration, interval);
}
public void onTick(long millisUntilFinished) {
// TODO Auto-generated method stub
millis = millisUntilFinished;
//if(millis == 21000){
// Toast.makeText(getApplicationContext(), String.valueOf(millis), Toast.LENGTH_SHORT).show();
// mp1.start();
//}
hms = String.format("%02d:%02d",
TimeUnit.MILLISECONDS.toMinutes(millis) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millis)),
TimeUnit.MILLISECONDS.toSeconds(millis) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis)));
timer.setText(hms);
}
@Override
public void onFinish() {
//time up
phoneRinging = false;
timer.setText("TIME UP!");
mp1.stop();
ans.setEnabled(false);
for(int j = 0; j<4;j++){
timer.setText("SOLUTION:");
words.remove(j);
aa.notifyDataSetChanged();
words.add(j,s1[j]);
aa.notifyDataSetChanged();
}
}
}
}
答案 0 :(得分：0)
可以通过简单地添加延迟而不是检查OnTick（）中的计时器值来完成，这将无效。延迟可以通过以下方式添加：
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
// Do something after 5s = 5000ms
mp1.start();
mp1.setLooping(true);
}
}, 100000);
把你希望在后台启动音频的延迟放在我的情况下。