Question

我是Android的新手，我试图测试Android 4.3的新蓝牙LE功能。我已按照here on the Android site找到的文档进行操作。但我正处于实际启动代码的绊脚石。

我想的只是有一个叫做scanLeDevice代码的按钮，但我看不到任何可以让我这么做的事情。我所拥有的只是这个类以及他们在制作新项目时制作的示例hello word app。

任何人都可以帮我吗？我知道它是愚蠢的，但我真的很难过。

作为参考，我的蓝牙课程是这样的：

public class DeviceScanActivity extends ListActivity {

private BluetoothAdapter mBluetoothAdapter;
private boolean mScanning;
private Handler mHandler;

// Stops scanning after 10 seconds.
private static final long SCAN_PERIOD = 10000;

private ArrayAdapter<Object> list;
private Handler handler = new Handler();

protected void OnCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    list = new ArrayAdapter<Object>(getApplicationContext(), android.R.layout.simple_list_item_1);
    setListAdapter(list);
    scanLeDevice(true);
}

@TargetApi(18)
public void scanLeDevice(final boolean enable) {
    list.add("Scanning...");
    final BluetoothAdapter adapter = getBluetoothAdapter();
    if (enable) {
        // Stops scanning after a pre-defined scan period.
        mHandler.postDelayed(new Runnable() {
            @Override
            public void run() {
                mScanning = false;

               // mBluetoothAdapter.stopLeScan(mLeScanCallback);
                adapter.stopLeScan(callback);
                list.clear();
            }
        }, SCAN_PERIOD);

        mScanning = true;
        adapter.startLeScan(callback);
    } else {
        mScanning = false;
        adapter.stopLeScan(callback);
    }

}
@TargetApi(18)
private BluetoothAdapter getBluetoothAdapter()
{
    BluetoothManager manager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
    return manager.getAdapter();
}
private final BluetoothAdapter.LeScanCallback callback = new BluetoothAdapter.LeScanCallback() 
{

    @Override
    public void onLeScan(final BluetoothDevice device, int rssi, byte[] scanRecord) {
        // TODO Auto-generated method stub

        {
            list.add("found: " + device);
            runOnUiThread(new Runnable(){
                @Override
                public void run()
                {
                    list.add(device);
                    list.notifyDataSetChanged();
                }
            });
    }
}
};

}

Answer 1

在MainActivity中添加一个新按钮：

<Button
    android:id="@+id/btnCallMethod"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    android:text="Call Method" />

将它放在MainActivity的onCreate（）

中

addListeners();

这就是addListeners（）方法在MainActivity中的样子：

private void addListeners() {
  Button btnCallMethod = (Button) this.findViewById(R.id.btnCallMethod);

  // CALL METHOD BUTTON
  btnCallMethod.setOnTouchListener(new OnTouchListener() {

     @Override
     public boolean onTouch(View v, MotionEvent event) {
     if (event.getAction() == MotionEvent.ACTION_UP) {
       Intent intent = new Intent(getApplicationContext(), DeviceScanActivity.class);
       startActivity(intent); // start the DeciveScanActivity
     }
     return false;
   }
 });
}

现在在DeviceScanActivity的onCreate（）方法中调用该方法

不要忘记将DeviceScanActivity添加到AndroidManifest.xml

<activity
     android:name="com.example.example.DeviceScanActivity"
</activity>

在Android中的另一个类中按下按钮时调用方法

1 个答案: