让我的代码正常工作。只是在一个部分遇到一点麻烦。
public void picksound(){
Intent mIntent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(mIntent, 1);
}
public void onActivityResult(int requestCode, int resultCode, Intent mIntent) {
if (resultCode == RESULT_OK && null != mIntent) {
if (requestCode == 1) {
Uri selectedRing = mIntent.getData();
}
}}
private void playSong(String selectedRing){
MediaPlayer mp = new MediaPlayer();
try {
mp.setDataSource(selectedRing);
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
mp.prepare();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mp.start();
}
public void alarmmsg(){
//ringtone player
playSong(selectedRing);
//
这就是我正在使用的代码。当我尝试调用playSong函数时,我被要求输入一个字符串,它似乎接受的唯一字符串是“null”。有人可以帮忙看看我做错了吗?