我是 Android 新手,我只是想开发一个可以打开/关闭设备上蓝牙的应用程序。此代码在 Android 4.2/4.3 上完美运行(在物理设备上测试);但是它不在 Android 4.0/4.1 上。任何人都可以帮我解决这个问题吗?
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.content.Context;
import android.content.Intent;
import android.media.AudioManager;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.SeekBar;
import android.widget.Switch;
import android.widget.TextView;
import android.view.Menu;
public class MainActivity extends Activity {
private static final int REQUEST_ENABLE_BT = 1;
private BluetoothAdapter bA;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void onResume(){
checkBluetooth();
setBluetoothListener();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
private void checkBluetooth(){
bA = BluetoothAdapter.getDefaultAdapter();
Switch blue = (Switch)findViewById(R.id.switch4);
blue.setChecked(true);
}
private void setBluetoothListener(){
Switch sBlue = (Switch) findViewById(R.id.switch4);
sBlue.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton arg0, boolean arg1) {
if (arg1) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
} else {
bA.disable();
}
}
});
}
}