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私のコードでは、startDiscovery（）を実行した後です。 何も起こっていないようだし、なぜかわからない。 @Mitchは、startDiscoveryを行うためにボタンを使用するように変更しました。 しかし、ボタンを押した直後にクラッシュするので、今より悪くなるようです。Android Studio Bluetooth startDiscoveyが動作しない
public class BTActivity extends AppCompatActivity{
private static final String TAG = "BTActivity";
BluetoothAdapter BTAdapter;
public ArrayList<BluetoothDevice> mBTDevices = new ArrayList<>();
public DeviceListAdapter mDeviceListAdapter;
ListView lvNewDevices;
private EcgView mEcgView;
//Create a BroadcastReceiver for
private final BroadcastReceiver mBroadcastReceiver1 = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(BTAdapter.ACTION_STATE_CHANGED)){
final int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BTAdapter.ERROR);
switch (state){
case BluetoothAdapter.STATE_OFF:
Log.d(TAG,"onReceive: STATE OFF");
break;
case BluetoothAdapter.STATE_TURNING_OFF:
Log.d(TAG,"onReceive: STATE TURNING OFF");
break;
case BluetoothAdapter.STATE_ON:
Log.d(TAG,"onReceive: STATE ON");
break;
case BluetoothAdapter.STATE_TURNING_ON:
Log.d(TAG,"onReceive: STATE TURNING ON");
break;
}
}
}
};
private final BroadcastReceiver mBroadcastReceiver2 = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if (action.equals(BluetoothAdapter.ACTION_SCAN_MODE_CHANGED)){
int mode = intent.getIntExtra(BluetoothAdapter.EXTRA_SCAN_MODE, BluetoothAdapter.ERROR);
switch (mode){
case BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE:
Log.d(TAG,"mBroadcastReceiver2: Discoverability Enabled");
break;
case BluetoothAdapter.SCAN_MODE_CONNECTABLE:
Log.d(TAG,"mBroadcastReceiver2: Discoverability Disabled. Able to receive connection");
break;
case BluetoothAdapter.SCAN_MODE_NONE:
Log.d(TAG,"mBroadcastReceiver2: Discoverability Disabled. Not able to receive connection");
break;
case BluetoothAdapter.STATE_CONNECTING:
Log.d(TAG,"mBroadcastReceiver2: Connecting");
break;
case BluetoothAdapter.STATE_CONNECTED:
Log.d(TAG,"mBroadcastReceiver2: Connected");
break;
}
}
}
};
private final BroadcastReceiver mBroadcastReceiver3 = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
Log.d(TAG, "OnReceive: ACTION FOUND");
if (action.equals(BluetoothDevice.ACTION_FOUND)) {
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
mBTDevices.add(device);
Log.d(TAG, "OnReceive: " + device.getName() + ": " + device.getAddress());
mDeviceListAdapter = new DeviceListAdapter(context, R.layout.device_adapter_view, mBTDevices);
lvNewDevices.setAdapter(mDeviceListAdapter);
}
}
};
private final BroadcastReceiver mBroadcastReceiver4 = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(BluetoothDevice.ACTION_BOND_STATE_CHANGED)) {
BluetoothDevice mDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
//3cases:
if (mDevice.getBondState() == BluetoothDevice.BOND_BONDED){
Log.d(TAG, "BroadcastReceiver: BOND_BOUNDED");
}
if (mDevice.getBondState() == BluetoothDevice.BOND_BONDING){
Log.d(TAG, "BroadcastReceiver: BOND_BOUNDING");
}
if (mDevice.getBondState() == BluetoothDevice.BOND_NONE){
Log.d(TAG, "BroadcastReceiver: BOND_NONE");
}
}
}
};
protected void onDestroy(){
super.onDestroy();
unregisterReceiver(mBroadcastReceiver1);
unregisterReceiver(mBroadcastReceiver2);
unregisterReceiver(mBroadcastReceiver3);
unregisterReceiver(mBroadcastReceiver4);
}
public boolean onCreateOptionsMenu (Menu menu){
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.main_menu,menu);
return super.onCreateOptionsMenu(menu);
}
public boolean onOptionsItemSelected(MenuItem item) {
super.onOptionsItemSelected(item);
switch (item.getItemId()) {
case R.id.enabledisable:
//if BT is enable, turn it off; if not then prompt user to enable BT;
if (!BTAdapter.getDefaultAdapter().isEnabled()) {
Intent i = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivity(i);
IntentFilter BTIntent = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
registerReceiver(mBroadcastReceiver1, BTIntent);
}
if(BTAdapter.getDefaultAdapter().isEnabled()) {
BTAdapter.getDefaultAdapter().disable();
IntentFilter BTIntent = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
registerReceiver(mBroadcastReceiver1, BTIntent);
}
return true;
case R.id.enablediscoverable:
Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
startActivity(discoverableIntent);
IntentFilter intentFilter = new IntentFilter(BTAdapter.ACTION_SCAN_MODE_CHANGED);
registerReceiver(mBroadcastReceiver2, intentFilter);
return true;
case R.id.discover:
Intent intent = new Intent(getApplicationContext(),SearchActivity.class);
startActivity(intent);
/*
Log.d(TAG,"Looking for unpaired devices");
if (BTAdapter.isDiscovering()){
BTAdapter.cancelDiscovery();
Log.d(TAG,"Canceling Discovery");
//checkBTPermissions();
BTAdapter.startDiscovery();
IntentFilter discoverDevicesIntent = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mBroadcastReceiver3, discoverDevicesIntent);
}
if (!BTAdapter.isDiscovering()){
//checkBTPermissions();
Log.d(TAG,"Searching Now");
BTAdapter.startDiscovery();
Log.d(TAG,"Still Searching Now");
IntentFilter discoverDevicesIntent = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mBroadcastReceiver3, discoverDevicesIntent);
Log.d(TAG,"123");
}
*/
return true;
default:
return false;
}
}
/*
private void checkBTPermissions() {
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP){
int permissionCheck = this.checkSelfPermission("Manifest.permission.ACCESS_FINE_LOCATATION");
permissionCheck += this.checkSelfPermission("Manifest.permission.ACCESS_COARSE_LOCATION");
if (permissionCheck != 0){
this.requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION}, 1001);
}
else{
Log.d(TAG, "checkBTPermissions: No need to check permissions. SDK Version < LOLLIPOP");
}
}
}
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bt);
lvNewDevices = (ListView) findViewById(R.id.lvNewDevices);
mBTDevices = new ArrayList<>();
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
registerReceiver(mBroadcastReceiver4,filter);
//lvNewDevices.setOnItemClickListener(BTActivity.this);
//Check if the phone support BT
BTAdapter = BluetoothAdapter.getDefaultAdapter();
if (BTAdapter == null) {
//System.exit(0);
}
//mConnectThread = new ConnectThread(mDevice);
//mConnectThread.start();
mEcgView = (EcgView) findViewById(R.id.ecgView);
}
public void toMainActivity(View view){
Intent intent = new Intent(getApplicationContext(),MainActivity.class);
startActivity(intent);
}
}
アクションバーから検索デバイスをクリックすると、アプリは別のアクティビティに移動します。しかし、そのアクティビティで[検索の開始]をクリックすると、アプリケーションがクラッシュします。論理が同じでなければならない理由は分かりません。
public class SearchActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {
private static final String TAG = "SearchActivity";
BluetoothAdapter BTAdapter;
public ArrayList<BluetoothDevice> mBTDevices = new ArrayList<>();
public DeviceListAdapter mDeviceListAdapter;
ListView lvNewDevices;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search);
lvNewDevices = (ListView) findViewById(R.id.lvNewDevices);
mBTDevices = new ArrayList<>();
lvNewDevices.setOnItemClickListener(SearchActivity.this);
}
private final BroadcastReceiver mBroadcastReceiver3 = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
Log.d(TAG, "OnReceive: ACTION FOUND");
if (action.equals(BluetoothDevice.ACTION_FOUND)) {
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
mBTDevices.add(device);
Log.d(TAG, "OnReceive: " + device.getName() + ": " + device.getAddress());
mDeviceListAdapter = new DeviceListAdapter(context, R.layout.device_adapter_view, mBTDevices);
lvNewDevices.setAdapter(mDeviceListAdapter);
}
}
};
public void btnDiscover(View view){
Log.d(TAG,"Looking for unpaired devices");
if (BTAdapter.isDiscovering()){
BTAdapter.cancelDiscovery();
Log.d(TAG,"Canceling Discovery");
//checkBTPermissions();
BTAdapter.startDiscovery();
IntentFilter discoverDevicesIntent = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mBroadcastReceiver3, discoverDevicesIntent);
}
if (!BTAdapter.isDiscovering()){
//checkBTPermissions();
Log.d(TAG,"Searching Now");
BTAdapter.startDiscovery();
Log.d(TAG,"Still Searching Now");
IntentFilter discoverDevicesIntent = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mBroadcastReceiver3, discoverDevicesIntent);
Log.d(TAG,"123");
}
}
public void backToBT(View view){
Intent intent = new Intent(getApplicationContext(),BTActivity.class);
startActivity(intent);
}
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
//Cancel Discovery as it's costly
BTAdapter.cancelDiscovery();
Log.d(TAG,"onItemClick:Clicked a Device");
String deviceName = mBTDevices.get(i).getName();
String deviceAddress = mBTDevices.get(i).getAddress();
Log.d(TAG,"onItemClick: Device Name: " + deviceName);
Log.d(TAG,"onItemClick: Device Address " + deviceAddress);
//Bonding
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.JELLY_BEAN_MR2){
Log.d(TAG, "Trying to pair with " + deviceName);
mBTDevices.get(i).createBond();
}
}
}
とマニフェストが装着されている
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.ted.pawan462">
<user-feature android:name="android.hardware.bluetooth" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.BLUETOOTH_PRIVILEGED" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
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>
<activity android:name=".BTActivity" />
<activity android:name=".SearchActivity"></activity>
</application>
</manifest>
これは私が、私はそれを悪化させているかもしれないと思うLogcat
1-07 21:40:39.633 32744-367/com.example.ted.pawan462 I/Adreno-EGL: <qeglDrvAPI_eglInitialize:379>: EGL 1.4 QUALCOMM build: Nondeterministic_AU_msm8974_LA.BF.1.1.3_RB1__release_AU (Ia6c73e7530)
OpenGL ES Shader Compiler Version: E031.29.00.00
Build Date: 12/04/15 Fri
Local Branch: mybranch17080070
Remote Branch: quic/LA.BF.1.1.3_rb1.5
Local Patches: NONE
Reconstruct Branch: NOTHING
01-07 21:40:39.635 32744-367/com.example.ted.pawan462 I/OpenGLRenderer: Initialized EGL, version 1.4
01-07 21:40:41.786 32744-32744/com.example.ted.pawan462 I/ListPopupWindow: Could not find method setEpicenterBounds(Rect) on PopupWindow. Oh well.
01-07 21:40:41.812 32744-32744/com.example.ted.pawan462 W/art: Before Android 4.1, method int android.support.v7.widget.ListViewCompat.lookForSelectablePosition(int, boolean) would have incorrectly overridden the package-private method in android.widget.ListView
01-07 21:43:54.309 32744-367/com.example.ted.pawan462 D/OpenGLRenderer: endAllStagingAnimators on 0x9db76280 (MenuPopupWindow$MenuDropDownListView) with handle 0x9d2784b0
01-07 21:43:55.320 32744-32744/com.example.ted.pawan462 D/SearchActivity: Looking for unpaired devices
01-07 21:43:55.327 32744-32744/com.example.ted.pawan462 D/AndroidRuntime: Shutting down VM
01-07 21:43:55.329 32744-32744/com.example.ted.pawan462 E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.ted.pawan462, PID: 32744
Theme: themes:{default=overlay:com.wsdeveloper.galaxys7, iconPack:com.wsdeveloper.galaxys7, fontPkg:com.wsdeveloper.galaxys7, com.android.systemui=overlay:com.wsdeveloper.galaxys7, com.android.systemui.navbar=overlay:com.wsdeveloper.galaxys7}
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
at android.view.View.performClick(View.java:5204)
at android.view.View$PerformClick.run(View.java:21158)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5461)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:5204)
at android.view.View$PerformClick.run(View.java:21158)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5461)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.bluetooth.BluetoothAdapter.isDiscovering()' on a null object reference
at com.example.ted.pawan462.SearchActivity.btnDiscover(SearchActivity.java:58)
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:5204)
at android.view.View$PerformClick.run(View.java:21158)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5461)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
です。
あなたのBluetoothAdapter（mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter（）;）はどこに宣言されているのかわかりませんが、onCreateメソッドでそれを守ってください。 – mitch