package com.example.bluetooth3;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.nfc.Tag;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
BluetoothAdapter blueadapter = BluetoothAdapter.getDefaultAdapter();
String TAG;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button search = findViewById(R.id.search);
IntentFilter intentFilter = new IntentFilter(BluetoothDevice.ACTION_FOUND);//注册广播接收信号
this.registerReceiver(receiver, intentFilter);
intentFilter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);//注册广播接收信号
this.registerReceiver(receiver, intentFilter);
if (blueadapter == null) {
Toast.makeText(MainActivity.this, "本机不支持蓝牙", Toast.LENGTH_LONG).show();
return;
}
if (!blueadapter.isEnabled()) {
blueadapter.enable();
Log.e(TAG,"蓝牙已打开");
Toast.makeText(MainActivity.this, "蓝牙已打开", Toast.LENGTH_LONG).show();
}
search.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
setProgressBarIndeterminateVisibility(true);
//setTitle("扫描中....");
if (blueadapter.isDiscovering()) {
//判断蓝牙是否正在扫描，如果是调用取消扫描方法；如果不是，则开始扫描
blueadapter.cancelDiscovery();
setTitle("停止扫描....");
}
blueadapter.startDiscovery();
setTitle("正在扫描....");
Log.e(TAG,"开始扫描");
}
});
}
private final BroadcastReceiver receiver = new BroadcastReceiver() {
TextView textView = (TextView) findViewById(R.id.textView2);
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
textView.append(device.getName() + ":" + device.getAddress() + "\n");
} else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
setProgressBarVisibility(false);
setTitle("已搜索完成");
}
}
};
}

1715049618