我有一个播放和停止按钮。当我运行以下代码时，播放按钮顺利进行。但是当我点击停止按钮时，我收到一条强制关闭消息。
我是android dev的新手。提前谢谢了！ ：）
package com.example.hellomedia;
import java.io.IOException;
import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.TextView;
public class HelloMedia extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final MediaPlayer mPlayer = MediaPlayer.create(HelloMedia.this, R.raw.nicholas);
setContentView(R.layout.main);
final Handler mHandler = new Handler();
final TextView customTextBG = (TextView) findViewById(R.id.customTextBG);
final TextView customTextHL = (TextView) findViewById(R.id.customTextHL);
customTextBG.setText("Nicholas was… \n\nOlder than sin, ");
customTextHL.setText("");
final String words[] = {
"Nicholas ", // 0
"was... \n\n", // 1
"Older ", // 2
"than ", // 3
"sin, ", // 4
};
final long startEndTime[][]={
{ //start time
1148,// 0,0
1826, // 0,1
2766,// 0,2
3079,// 0,3
3549,// 0,4
},
{ //end time
1357,// 1,0
2192, // 1,1
3027,// 1,2
3183,// 1,3
3966,// 1,4
}
};
customTextBG.setText("Nicholas was… \n\nOlder than sin, ");
customTextHL.setText("");
View.OnClickListener handler = new View.OnClickListener(){
public void onClick(View v) {
switch (v.getId()) {
case R.id.widget30: // PLAY
if( !mPlayer.isPlaying() ){
try {
mPlayer.prepare();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mPlayer.start();
mHandler.post(new Runnable(){
public void run(){
final long currentPos = mPlayer.getCurrentPosition();
int x = 0;
while( x < 102){
if( currentPos > startEndTime[0][x] && currentPos < startEndTime[1][x] ){//0
customTextHL.append(words[x]);
words[x]="";
}
x++;
} mHandler.postDelayed(this, 1);
}
});
}
break;
case R.id.widget31: // RESET
mHandler.post(new Runnable(){
public void run(){
customTextBG.setText("Nicholas was… \n\nOlder than sin, ");
customTextHL.setText("");
}
});
mPlayer.stop();
mPlayer.release();
break;
}
}
};
// BUTTONS
findViewById(R.id.widget30).setOnClickListener(handler); // PLAY
findViewById(R.id.widget31).setOnClickListener(handler); // RESET
}
}
我的main.xml代码：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
android:id="@+id/widget29"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
>
<TextView
android:textStyle="bold"
android:id="@+id/customTextBG"
android:textSize="18sp"
android:text="@+id/customTextBG"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/widget31"
android:layout_alignParentLeft="true"
>
</TextView>
<TextView
android:textStyle="bold"
android:id="@+id/customTextHL"
android:textSize="18sp"
android:text="@+id/customTextHL"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/widget31"
android:layout_alignParentLeft="true"
android:textColor="#00FF00"
>
</TextView>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/widget30"
android:text="@string/reset" android:id="@+id/widget31">
</Button>
<Button
android:id="@+id/widget30"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:text="@string/play">
</Button>
</RelativeLayout>
答案 0 :(得分：2)
首先，不要尝试：
mHandler.post(new Runnable(){
public void run(){
customTextBG.setText("Nicholas was… \n\nOlder than sin, ");
customTextHL.setText("");
}
});
和停止播放器的代码：
if(mPlayer.isPlaying())
{
mPlayer.stop();
}
第二，你可以提供你的xmlfiles，然后我们可以测试它并查看错误。
答案 1 :(得分：1)
像这样放一个try catch块 -
try {
mPlayer.stop();
mPlayer.release();
} catch(Exception ex) {
ex.printStackTrace()
}
如果您的设备设置为调试应用程序，请在catch块中放置一个断点，并告诉我们异常所说的内容。您也可以使用模拟器进行调试。
答案 2 :(得分：1)
以上代码被修改为以下代码并根据您的要求输出。当您通过MediaPlayer.create（....）方法创建媒体播放器时，无需再次准备它。一旦释放或重置方法，就应该要求它们重新初始化数据源。
public class HelloMedia extends Activity {
MediaPlayer mPlayer;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mPlayer = MediaPlayer.create(HelloMedia .this, R.raw.sleepaway);
setContentView(R.layout.main);
final Handler mHandler = new Handler();
final TextView customTextBG = (TextView) findViewById(R.id.customTextBG);
final TextView customTextHL = (TextView) findViewById(R.id.customTextHL);
customTextBG.setText("Nicholas was… \n\nOlder than sin, ");
customTextHL.setText("");
final String words[] = {
"Nicholas ", // 0
"was... \n\n", // 1
"Older ", // 2
"than ", // 3
"sin, ", // 4
};
final long startEndTime[][]={
{ //start time
1148,// 0,0
1826, // 0,1
2766,// 0,2
3079,// 0,3
3549,// 0,4
},
{ //end time
1357,// 1,0
2192, // 1,1
3027,// 1,2
3183,// 1,3
3966,// 1,4
}
};
customTextBG.setText("Nicholas was… \n\nOlder than sin, ");
customTextHL.setText("");
View.OnClickListener handler = new View.OnClickListener(){
public void onClick(View v) {
switch (v.getId()) {
case R.id.widget30: // PLAY
try{
if(mPlayer==null)
mPlayer = MediaPlayer.create(HelloMedia .this, R.raw.sleepaway);
if( !mPlayer.isPlaying() )
{
if(!mPlayer.isPlaying())
mPlayer.start();
mHandler.post(new Runnable(){
public void run(){
if(mPlayer!=null)
if(mPlayer.isPlaying()){
final long currentPos = mPlayer.getCurrentPosition();
int x = 0;
while( x < 5){
if( currentPos > startEndTime[0][x] && currentPos < startEndTime[1][x] ){//0
customTextHL.append(words[x]);
words[x]="";
}
x++;
} mHandler.postDelayed(this, 1);
}
}});
}
}catch (Exception e) {
e.printStackTrace();
// TODO: handle exception
}
break;
case R.id.widget31: // RESET
mHandler.post(new Runnable(){
public void run(){
customTextBG.setText("Nicholas was… \n\nOlder than sin, ");
customTextHL.setText("");
}
});
try{
if(mPlayer.isPlaying())
{
mPlayer.stop();
mPlayer.reset();
mPlayer=null;
}
}catch (Exception e) {
e.printStackTrace();
// TODO: handle exception
}
break;
}
}
};
// BUTTONS
findViewById(R.id.widget30).setOnClickListener(handler); // PLAY
findViewById(R.id.widget31).setOnClickListener(handler); // RESET
}
}
答案 3 :(得分：0)
这是我的代码，已经过测试并正常运行
package com.example.com.mak.mediaplayer;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.app.Activity;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final MediaPlayer mpp;
mpp=MediaPlayer.create(this,R.raw.red); //mp3 file in res/raw folder
Button btnplay=(Button)findViewById(R.id.btnplay); //Play
btnplay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View vone) {
mpp.start();}
});
Button btnpause=(Button)findViewById(R.id.btnpause); //Pause
btnpause.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View vtwo) {
if(mpp.isPlaying())
{
mpp.pause();
mpp.seekTo(0);
}
}
});
}
}
答案 4 :(得分：0)
if(mPlayer != null){
mPlayer.release();
}