讓我的代碼工作。只有一個部分有點麻煩。無法設置字符串到對象
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);
//
這就是我正在使用的代碼。當我嘗試調用playSong函數時,我被要求輸入一個字符串,並且它似乎接受的唯一字符串是「null」。有人可以幫助看到我做錯了什麼嗎?
似乎沒有做任何事情:/ –
這是什麼意思? –