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Android 앱 개발을 처음 사용했습니다. 블루투스 장치를 발견하고 목록에 표시 할 수있는 앱을 프로그래밍하려고합니다. BroadcastReceiver을 사용하여 발견 된 기기를 목록에 추가했지만, BroadcastReceiver을 추가 한 이후에 앱을 시작할 때 충돌이 계속 발생합니다.Android : 시작시 Bluetooth 앱이 다운 됨
Oneplus 3 (Android 7.1.1) 및 Huawei P8 Lite (Android 6)에서 앱을 테스트했습니다.
는내 코드 : MainActivity.java는
는package com.example.jeroen.testbluetooth;
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.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.Set;
public class MainActivity extends AppCompatActivity {
private final static int REQUEST_ENABLE_BT = 1; // static variable for intent to start BT, must be locally declared
private final ArrayAdapter<String> btArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1);
private ListView listView = (ListView) findViewById(R.id.ListView); // findViewById(int id), id must match with id of view in layout file
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
// callback function must have view parameter
public void BtnConnectToDevice(View view) {
// check if BT is supported
BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); // get bluetooth adapter of this device
if (mBluetoothAdapter == null) {
// Device does not support Bluetooth
// app shuts down
// TODO show message for user
finishAndRemoveTask();
}
// check if BT is enabled, if not turn on
// startActivityForResult returns result of request (successful or cancelled)
if (!mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); // create Intent to enable bluetooth
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT); // TODO no result in the moment
}
// get all paired devices as set (set = unsorted array/list)
Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
// add names and addresses of paired devices to array
if (pairedDevices.size() > 0) {
// There are paired devices. Get the name and address of each paired device.
// for loop every element of pairedDevices is passed and temporary copied into "device"
for (BluetoothDevice device : pairedDevices) {
String deviceName = device.getName();
String deviceHardwareAddress = device.getAddress(); // MAC address
// add items to adapter
btArrayAdapter.add(deviceName + "\n"
+ deviceHardwareAddress);
}
}
// if scanning already running, stop
if (mBluetoothAdapter.isDiscovering()) {
mBluetoothAdapter.cancelDiscovery();
}
// search for devices
mBluetoothAdapter.startDiscovery();
// Register the broadcast receiver
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mReceiver, filter);
// TODO do something with the list
// show array in listView
// connect btArrayAdapter to ListView
// ListView listView = (ListView) findViewById(R.id.ListView); // findViewById(int id), id must match with id of view in layout file
// listView.setAdapter(btArrayAdapter);
}
@Override
protected void onDestroy() {
// Don't forget to unregister the ACTION_FOUND receiver.
unregisterReceiver(mReceiver);
// super.onDestroy();
}
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// A Bluetooth device was found
// Getting device information from the intent
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// add newly discovered devices to list
String deviceName = device.getName();
String deviceHardwareAddress = device.getAddress(); // MAC address
// add items to adapter
btArrayAdapter.add(deviceName + "\n"
+ deviceHardwareAddress);
}
}
};
}
activity_main.xml :
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.jeroen.testbluetooth.MainActivity">
<Button
android:id="@+id/BtnConnectToDevice"
android:layout_width="144dp"
android:layout_height="48dp"
android:layout_marginLeft="120dp"
android:layout_marginStart="120dp"
android:layout_marginTop="16dp"
android:elevation="0dp"
android:onClick="BtnConnectToDevice"
android:text="Connect"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ListView
android:id="@+id/ListView"
android:layout_width="368dp"
android:layout_height="437dp"
android:layout_marginBottom="10dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent" />
</android.support.constraint.ConstraintLayout>
의 AndroidManifest.xml : 나는이 BroadcastReceiver를 삭제하면
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.jeroen.testbluetooth">
// permissions
<uses-permission android:name="android.permission.BLUETOOTH" /> // Allows applications to connect to paired bluetooth devices
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" /> // Allows applications to discover and pair bluetooth devices
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
앱은 잘 시작 ,하지만 그것 없이는 장치를 검색 할 수 없습니다.
나를 도와 주시면 감사하겠습니다. 추가 정보가 필요하면 언제든지 물어보십시오.
최저 관련,
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충돌 로그를 붙여 넣으십시오. – Godather