我试图在点击按钮时在模拟器上播放声音文件，但我收到消息“应用程序播放音频已意外停止”
我的代码是：
package com.java4u.android;
import android.app.Activity;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class p1 extends Activity {
// creating instance of media player
MediaPlayer mp=MediaPlayer.create(this,R.raw.meow);
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button btnSound=(Button)this.findViewById(R.id.playSound);
btnSound.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent("com.java4u.android.p1"));
mp.start();
}
});
}
}
的Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.java4u.android"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="8" />
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".p1" android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
main.xml中
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<Button android:text="play audio"
android:id="@+id/playSound"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
</Button>
</LinearLayout>
答案 0 :(得分：6)
试试这个：
Button btn1=(Button)findViewById(R.id.xBtn1);
btn1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final MediaPlayer mp1=MediaPlayer.create(getBaseContext(), R.raw.fruit_dance);
mp1.start();
}
}
答案 1 :(得分：2)
将MediaPlayer实例的创建移至onCreate方法。
这将使您的应用程序运行：
// creating instance of media player
MediaPlayer mp;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mp = MediaPlayer.create(this, R.raw.ljudman__grenade);
此外，如果您尝试在按钮单击时启动活动的新实例，我相信这是正确的方法：
startActivity(new Intent(p1.this, p1.class));
答案 2 :(得分：2)
mp.start()应该在开始新活动之前。
btnSound.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mp.start();
startActivity(new Intent(currentActivityName.this, newActivityName.class));
}
});
答案 3 :(得分：0)
<?php
require('../admin/html2pdf/html2pdf.class.php');
ob_start();
?>
<page>
<page_header>
<br>
<table>
<tr class="headings" style="background-color: #FFFFFF;">
<th class="column-title">Home</th>
<th class="column-title"><h3>web site</h3></div></th>
<th class="column-title">Home</th>
</tr>
</table>
</page_header>
<page_footer>
<div>
<TABLE BORDER = "1" id="table2">
<TR style="background-color: #f2f2f2;">
<TH COLSPAN=3 style="width: %;text-align: center;">Footer</TH>
<TH COLSPAN=3 style="width: %;text-align: center">Copyright </TH>
<TH COLSPAN=3 style="width: %;text-align: center">Copyright </TH>
</TR>
<TR>
<TD >test</TD> <TD>test</TD><TD>test</TD> <TD>test</TD> <TD>test</TD> <TD>test</TD><TD>test</TD> <TD>test</TD> <TD>test</TD>
</TR>
</TABLE>
</div>
</page_footer>
</page>
**Content :**
<div style="" id="table1" class="content">
<table>
<tr class="headings" style="background-color: #f2f2f2;">
<th class="column-title" style="width: 0px">firstname</th>
<th class="column-title" style="width: 80px">lastname</th>
<th class="column-title" style="width: 80px">mail</th>
<th class="column-title" style="width: 80px">phone</th>
<th class="column-title" style="width: 80px">login</th>
<th class="column-title" style="width: 80px">password</th>
<th class="column-title" style="width: 80px">birthday</th>
</tr>
<tbody>
<tr class="even pointer">
<td class=" "><p style="">firstname1</p></td>
<td class=" "><p style="">lastname1</p></td>
<td class=" "><p style="">mail1</p></td>
<td class=" "><p style="">phone1</p></td>
<td class=" "><p style="">login1</p></td>
<td class=" "><p style="">password1</p></td>
<td class=" "><p style="">birthday1</p></td>
</tr>
<tr class="even pointer">
<td class=" "><p style="">firstname2</p></td>
<td class=" "><p style="">lastname2</p></td>
<td class=" "><p style="">mail2</p></td>
<td class=" "><p style="">phone2</p></td>
<td class=" "><p style="">login2</p></td>
<td class=" "><p style="">password2</p></td>
<td class=" "><p style="">birthday2</p></td>
</tr>
<tr class="even pointer">
<td class=" "><p style="">firstname3</p></td>
<td class=" "><p style="">lastname3</p></td>
<td class=" "><p style="">mail3</p></td>
<td class=" "><p style="">phone3</p></td>
<td class=" "><p style="">login3</p></td>
<td class=" "><p style="">password3</p></td>
<td class=" "><p style="">birthday3</p></td>
</tr>
<tr class="even pointer">
<td class=" "><p style="">firstname4</p></td>
<td class=" "><p style="">lastname4</p></td>
<td class=" "><p style="">mail4</p></td>
<td class=" "><p style="">phone4</p></td>
<td class=" "><p style="">login4</p></td>
<td class=" "><p style="">password4</p></td>
<td class=" "><p style="">birthday4</p></td>
</tr>
<tr class="even pointer">
<td class=" "><p style="">firstname5</p></td>
<td class=" "><p style="">lastname5</p></td>
<td class=" "><p style="">mail5</p></td>
<td class=" "><p style="">phone5</p></td>
<td class=" "><p style="">login5</p></td>
<td class=" "><p style="">password5</p></td>
<td class=" "><p style="">birthday5</p></td>
</tr>
<tr class="even pointer">
<td class=" "><p style="">firstname6</p></td>
<td class=" "><p style="">lastname6</p></td>
<td class=" "><p style="">mail6</p></td>
<td class=" "><p style="">phone6</p></td>
<td class=" "><p style="">login6</p></td>
<td class=" "><p style="">password6</p></td>
<td class=" "><p style="">birthday6</p></td>
</tr>
<tr class="even pointer">
<td class=" "><p style="">firstname7</p></td>
<td class=" "><p style="">lastname7</p></td>
<td class=" "><p style="">mail7</p></td>
<td class=" "><p style="">phone7</p></td>
<td class=" "><p style="">password7</p></td>
<td class=" "><p style="">password7</p></td>
<td class=" "><p style="">birthday7</p></td>
</tr>
<tr class="even pointer">
<td class=" "><p style="">firstname8</p></td>
<td class=" "><p style="">lastname8</p></td>
<td class=" "><p style="">mail8</p></td>
<td class=" "><p style="">phone8</p></td>
<td class=" "><p style="">login8</p></td>
<td class=" "><p style="">password8</p></td>
<td class=" "><p style="">birthday8</p></td>
</tr>
<tr class="even pointer">
<td class=" "><p style="">firstname9</p></td>
<td class=" "><p style="">lastname9</p></td>
<td class=" "><p style="">mail9</p></td>
<td class=" "><p style="">phone9</p></td>
<td class=" "><p style="">login9</p></td>
<td class=" "><p style="">password9</p></td>
<td class=" "><p style="">birthday9</p></td>
</tr>
<tr class="even pointer">
<td class=" "><p style="">firstname10</p></td>
<td class=" "><p style="">lastname10</p></td>
<td class=" "><p style="">mail10</p></td>
<td class=" "><p style="">phone10</p></td>
<td class=" "><p style="">login10</p></td>
<td class=" "><p style="">password10</p></td>
<td class=" "><p style="">birthday10</p></td>
</tr>
<tr class="even pointer">
<td class=" "><p style="">firstname11</p></td>
<td class=" "><p style="">lastname11</p></td>
<td class=" "><p style="">mail11</p></td>
<td class=" "><p style="">phone11</p></td>
<td class=" "><p style="">login11</p></td>
<td class=" "><p style="">password11</p></td>
<td class=" "><p style="">birthday11</p></td>
</tr>
<tr class="even pointer">
<td class=" "><p style="">firstname12</p></td>
<td class=" "><p style="">lastname12</p></td>
<td class=" "><p style="">mail12</p></td>
<td class=" "><p style="">phone12</p></td>
<td class=" "><p style="">login12</p></td>
<td class=" "><p style="">password12</p></td>
<td class=" "><p style="">birthday12</p></td>
</tr>
<tr class="even pointer">
<td class=" "><p style="">firstname13</p></td>
<td class=" "><p style="">lastname13</p></td>
<td class=" "><p style="">mail13</p></td>
<td class=" "><p style="">phone13</p></td>
<td class=" "><p style="">login3</p></td>
<td class=" "><p style="">password13</p></td>
<td class=" "><p style="">birthday13</p></td>
</tr>
</tbody>
</table>
</div>
<?php
$content = ob_get_clean(); // récupère tout le contenu depuis ob_start()
// ou $content = ob_get_clean() ça fonctionne également;
$pdf = new HTML2PDF('P', 'A4', 'fr');
$pdf->pdf->SetDisplayMode('fullpage');
$pdf->writeHTML($content);
ob_clean();
$pdf->Output('test.pdf');
?>