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新的android dev有希望。我一直在试图实现一个应用程序,按住“确定”按钮,它会播放默认的铃声循环。Android App按住按钮播放声音
我有什么到目前为止
package com.tick.helloAndroid;
import net.technologichron.android.control.NumberPicker;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.content.Intent;
import android.media.MediaPlayer;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Bundle;
//import android.widget.TextView;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.Toast;
public class main extends Activity implements OnTouchListener {
private int REQUEST_ENABLE_BT = 1;
private MediaPlayer mp;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Set up the window layout
setContentView(R.layout.main);
final Button zero = (Button) this.findViewById(R.id.ok);
zero.setOnTouchListener(this);
Uri alert = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_RINGTONE);
mp.setDataSource(this, alert);
}
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mp.setLooping(true);
mp.start();
case MotionEvent.ACTION_UP:
mp.pause();
}
return true;
}
}
From doing some searching on SO, this seems to work for some people,然而,行
mp.setDataSource(this, alert);
似乎不起作用。如果不工作,我的意思是,它迫使一个“未处理的异常错误”,当我尝试在Android模拟器运行应用程序,它在做一个try-catch语句,
try {
mp.setDataSource(this, alert);
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
Toast.makeText(this, "args", Toast.LENGTH_LONG).show();
finish();
return;
} catch (SecurityException e) {
// TODO Auto-generated catch block
Toast.makeText(this, "sec", Toast.LENGTH_LONG).show();
finish();
return;
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
Toast.makeText(this, "illega", Toast.LENGTH_LONG).show();
finish();
return;
} catch (IOException e) {
// TODO Auto-generated catch block
Toast.makeText(this, "io", Toast.LENGTH_LONG).show();
finish();
return;
}
没有任何错误,但崩溃编译,它不打印任何上述渔获物的字符串。
任何关于我做错了什么的想法和想法将不胜感激。
编辑:可能是因为em没有铃声这个事实吗?
什么是例外?请记住:try/catch是运行时错误。 – ethrbunny
未处理的异常错误,当您为大量可能的异常执行一系列catch语句时,该应用程序会编译好的错误。但是运行时,它只会崩溃 –