最近需要弄一个蓝牙方面的功能，第一个想法是先把其余的蓝牙设备获取到再说，看了下网上的demo感觉真的是so easy啊，于是就马上开干了。一通操作过后，居然不显示。。。。。。好吧！继续搜寻帮助，结果就是自己太二了，6.0以后的一些权限是需要动态申请的。且6.0之后的蓝牙也有所变化，好了，看代码吧。
1.首先是需要的权限
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<!--6.0之后需要定位权限-->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />接下来是Activity以及layout的代码
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.gzw.bluetoothtest.MainActivity">
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="19dp"
android:text="搜索蓝牙" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/button"
android:layout_marginBottom="14dp"
android:layout_marginLeft="45dp"
android:layout_marginStart="45dp"
android:layout_toEndOf="@+id/button"
android:layout_toRightOf="@+id/button"
android:text="初始状态" />
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_below="@+id/button"
android:layout_marginLeft="12dp"
android:layout_marginStart="12dp"
android:layout_marginTop="53dp"
android:text="已配对蓝牙设备如下：" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView"
android:layout_alignStart="@+id/textView"
android:layout_below="@+id/textView"
android:layout_marginTop="107dp"
android:text="未配对蓝牙设备如下：" />
</RelativeLayout>package com.example.gzw.bluetoothtest;
import android.Manifest;
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.content.pm.PackageManager;
import android.os.Build;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
private BluetoothAdapter bluetoothAdapter;
private TextView text1,text2,text3;
private Button button;
private static final String TAG = "MainActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
text1 = findViewById(R.id.textView);
text2 = findViewById(R.id.textView2);
text3 = findViewById(R.id.textView3);
button = findViewById(R.id.button);
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter == null){
Toast.makeText(this,"设备不支持蓝牙",Toast.LENGTH_SHORT).show();
}
if (!bluetoothAdapter.isEnabled()){
bluetoothAdapter.enable();
}
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mReceiver,filter);
IntentFilter filter1 = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
registerReceiver(mReceiver,filter1);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
requestPermission();
text2.setText("正在搜索...");
}
});
}
/**
* 动态处理权限
*/
private void requestPermission() {
if (Build.VERSION.SDK_INT >= 23) {
int checkAccessFinePermission = ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION);
if (checkAccessFinePermission != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
1);
Log.d(TAG, "没有权限，请求权限");
return;
} else {
/**
* 如果已经同意了该权限则开始搜索设备
*/
bluetoothAdapter.startDiscovery();
}
Log.d(TAG, "已有定位权限");
}
}
/**
* 申请权限回调方法 处理用户是否授权
* @param requestCode
* @param permissions
* @param grantResults
*/
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
switch (requestCode) {
case 1: {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
/**
* 用户同意授权开始搜索设备
*/
bluetoothAdapter.startDiscovery();
} else {
//用户拒绝授权 则给用户提示没有权限功能无法使用，
Log.d(TAG, "没有定位权限，请先开启!");
}
}
}
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(mReceiver);
}
/**
* 创建广播接收器
*/
private BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(BluetoothDevice.ACTION_FOUND)){
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if (device.getBondState() == BluetoothDevice.BOND_BONDED){
//显示已经配对的设备
text1.append("\n" + device.getName() + "==>" + device.getAddress() + "\n");
}else if (device.getBondState() != BluetoothDevice.BOND_BONDED){
text3.append("\n" + device.getName() + "==>" + device.getAddress() + "\n");
}
}else if (action.equals(BluetoothAdapter.ACTION_DISCOVERY_FINISHED)){
text2.setText("搜索完成");
}
}
};
}最后来个效果图
测试的时候需要先将蓝牙打开，这一块这可以自己稍微再修改下就好。
本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。
