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Androidアプリの開発には初めてです。私は、Bluetoothデバイスを発見してリストに表示できるアプリをプログラムしようとしています。 私はBroadcastReceiverを使用して、検出されたデバイスをリストに追加しますが、BroadcastReceiverを追加したので、起動時にアプリケーションがクラッシュします。Android：Bluetoothアプリケーションが起動時にクラッシュする
私はOneplus 3（Android 7.1.1）とHuawei P8 Lite（Android 6）でアプリをテストしました。
マイコード： MainActivity.java
package 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>
のAndroidManifest.xml：
<?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>
私はBroadcastReceiverを削除するとアプリがうまく起動しますそれがなければ、私はデバイスをスキャンすることはできません。
誰かが私を助けることができれば幸いです。 追加情報が必要な場合は、お気軽にお問い合わせください。ここで
ベストに関しては、
のJeroen
クラッシュログを貼り付けてください。 – Godather