Fragment4-优快云博客

本文介绍了一个简单的Android应用组件——Fragment4，该组件用于检测设备蓝牙的状态，并在TextView中显示蓝牙是否开启、关闭或未安装。代码实现了通过BluetoothAdapter获取默认适配器并判断蓝牙是否启用的功能。

package com.example.week;

import android.bluetooth.BluetoothAdapter;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

/**
 * Created by 生哥 on 2017/12/2.
 */

public class Fragment4 extends Fragment {
    private TextView tv4;
    private BluetoothAdapter bluetoothAdapter;
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment4,container,false);
        tv4 = view.findViewById(R.id.tv4);
        return view;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        if (bluetoothAdapter != null){
            boolean b = bluetoothAdapter.isEnabled();
            if (b){
                tv4.setText("开启");
            }else {
                tv4.setText("关闭");
            }
        }else {
            tv4.setText("没有");
        }
    }
}