打开蓝牙并等待意图？

Question

我有一个需要一些蓝牙设置的Android应用程序；见下文：

if (!Constants.mBluetoothAdapter.isEnabled()) {
    Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
    startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
}
while (!Constants.mBluetoothAdapter.isEnabled()) {
    try {
        Thread.sleep(100);
    } catch (InterruptedException e) {
        System.exit(1);
    }
}
if (Constants.mBluetoothAdapter.getScanMode() != BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
    Intent discoverableIntent = new
        Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
        discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 0);
        startActivity(discoverableIntent);
}
while (Constants.mBluetoothAdapter.getScanMode() != BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
    try {
        Thread.sleep(100);
    } catch (InterruptedException e) {
        System.exit(1);
    }
} // do some stuff with bluetooth

对我来说，这似乎是一种hack，仅当用户选择“是”时，它才起作用。我很确定我需要等待这些意图的结果。怎么做？

Answer 1

您可以调用startActivityForResult()并实现onActivityResult()当用户从被调用活动返回时将被调用的方法。

要检查是否启用了蓝牙，请将代码更改为：

if (!Constants.mBluetoothAdapter.isEnabled()) {
    Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
    startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
} else {
    progressToNextCheck();
}

然后，在progressNextCheck()工具中以类似方式检查蓝牙可发现性。

private void progressToNextCheck(){
    if (Constants.mBluetoothAdapter.getScanMode() != BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
        Intent discoverableIntent = new        Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
        discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 0);
        startActivityForResult(discoverableIntent, REQUEST_DISCOVERABLE_BT);
    } else {
        goToTheTask();
    }
}

而你的onActivityResult()方法：

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
     if (requestCode == REQUEST_ENABLE_BT) {
         if (resultCode == RESULT_OK) {
             progressToNextCheck();
         }
     } else if (requestCode == REQUEST_DISCOVERABLE_BT) {
         if (resultCode == RESULT_OK) {
             goToTheTask();
         }
     }
 }