0
我正在编写一个Android应用程序,用于将计步器与使用蓝牙的Android应用程序进行接口连接。 这里是蓝牙Android蓝牙编程
package com.example.bluetooth_demo;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.bluetooth.BluetoothAdapter;
import android.content.Intent;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Toast;
public class Simer extends ActionBarActivity {
ArrayAdapter<String> listadapter ;
Button connectnew;
BluetoothAdapter btadapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_simer);
init();
if(btadapter==null){
Toast.makeText(getApplicationContext(), "No bluetooth", 0).show();
finish();
}
else{
if (!btadapter.isEnabled()) {
Intent turnOnIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(turnOnIntent, 1);
Toast.makeText(getApplicationContext(),"Bluetooth turned on" ,
Toast.LENGTH_LONG).show();
}
else{
Toast.makeText(getApplicationContext(),"Bluetooth is already on",
Toast.LENGTH_LONG).show();
}
}
}
private void init(){
connectnew = (Button)findViewById(R.id.button1);
btadapter = BluetoothAdapter.getDefaultAdapter();
}
}
我的示例代码,它工作正常,直到我编程高达
if(btadapter==null){
Toast.makeText(getApplicationContext(), "No bluetooth", 0).show();
finish();
}
但是当我加入如下代码
if (!btadapter.isEnabled()) {
Intent turnOnIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(turnOnIntent, 1);
Toast.makeText(getApplicationContext(),"Bluetooth turned on" ,
Toast.LENGTH_LONG).show();
}
else{
Toast.makeText(getApplicationContext(),"Bluetooth is already on",
Toast.LENGTH_LONG).show();
}
没有奏效。它给出了一个错误不幸的是,应用程序已停止,并在日食我没有找到源。
什么问题? 我想如果(!btadapter.isEnabled())正在创建一些问题。
在“turnOnintent”和跟随行上设置一些断点,以便您可以看到异常。 startActivity行可能会引发异常 – 2014-12-05 12:12:14