我正在构建一个由BLE收到的消息控制的Android音乐播放器。我的应用程序在API 4.4（18）上工作正常，但它可能由于错误的线程处理而在8.1（27）中崩溃。这是我的扫描活动和音乐播放器活动以及来自LogCat的错误
扫描活动
public class MainActivity extends Activity {
private BluetoothAdapter mBluetoothAdapter;
private static final int REQUEST_ENABLE_BT = 1;
private static final long SCAN_PERIOD = 3000;
private Dialog mDialog;
public static final int permconst=7;
public static List<BluetoothDevice> mDevices = new ArrayList<BluetoothDevice>();
public static MainActivity instance = null;
private View mPermissionRationale;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setContentView(R.layout.main);
checkperms();
if (!getPackageManager().hasSystemFeature(
PackageManager.FEATURE_BLUETOOTH_LE)) {
Toast.makeText(this, "Ble not supported", Toast.LENGTH_SHORT)
.show();
finish();
}
final BluetoothManager mBluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
mBluetoothAdapter = mBluetoothManager.getAdapter();
if (mBluetoothAdapter == null) {
Toast.makeText(this, "Ble not supported", Toast.LENGTH_SHORT)
.show();
finish();
return;
}
if (!mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(
BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
}
ImageButton btn = (ImageButton) findViewById(R.id.btn);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
scanLeDevice();
showRoundProcessDialog(MainActivity.this, R.layout.loading_process_dialog_anim);
Timer mTimer = new Timer();
mTimer.schedule(new TimerTask() {
@Override
public void run() {
Intent deviceListIntent = new Intent(getApplicationContext(),
Device.class);
startActivity(deviceListIntent);
mDialog.dismiss();
}
}, SCAN_PERIOD);
}
});
//scanLeDevice();
showRoundProcessDialog(MainActivity.this, R.layout.loading_process_dialog_anim);
Timer mTimer = new Timer();
mTimer.schedule(new TimerTask() {
@Override
public void run() {
Intent deviceListIntent = new Intent(getApplicationContext(),
Device.class);
startActivity(deviceListIntent);
mDialog.dismiss();
}
}, SCAN_PERIOD);
instance = this;
}
public void showRoundProcessDialog(Context mContext, int layout) {
DialogInterface.OnKeyListener keyListener = new DialogInterface.OnKeyListener() {
@Override
public boolean onKey(DialogInterface dialog, int keyCode,
KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_HOME
|| keyCode == KeyEvent.KEYCODE_SEARCH) {
return true;
}
return false;
}
};
mDialog = new AlertDialog.Builder(mContext).create();
mDialog.setOnKeyListener(keyListener);
mDialog.show();
// 娉ㄦ��姝ゅ��瑕���惧��show涔���� ������浼���ュ��甯�
mDialog.setContentView(layout);
}
private void scanLeDevice() {
//checkperms();
// new Thread() {
final Handler handler =new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
// if(Build.VERSION.SDK_INT>21){
// mBluetoothAdapter.getBluetoothLeScanner().startScan(mleScanCallback);}
mBluetoothAdapter.startLeScan(mLeScanCallback);
}
},4000);
mBluetoothAdapter.stopLeScan(mLeScanCallback);
}
private BluetoothAdapter.LeScanCallback mLeScanCallback = new BluetoothAdapter.LeScanCallback() {
@Override
public void onLeScan(final BluetoothDevice device, final int rssi,
byte[] scanRecord) {
runOnUiThread(new Runnable() {
// new Thread(){
@Override
public void run() {
if (device != null) {
if (mDevices.indexOf(device) == -1)
mDevices.add(device);
}
}
});
}
};
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// User chose not to enable Bluetooth.
if (requestCode == REQUEST_ENABLE_BT
&& resultCode == Activity.RESULT_CANCELED) {
finish();
return;
}
super.onActivityResult(requestCode, resultCode, data);
}
@Override
protected void onDestroy() {
super.onDestroy();
//scanLeDevice(false);
mDevices.clear();
System.exit(0);
}
private void checkperms(){
if(Build.VERSION.SDK_INT>19) {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED){
Toast.makeText(this, "permissions not granted", Toast.LENGTH_SHORT)
.show();
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.ACCESS_COARSE_LOCATION))
Toast.makeText(this, "pls grant permissions", Toast.LENGTH_SHORT)
.show();
else {
// No explanation needed; request the permission
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_COARSE_LOCATION},
permconst);
return;}
}}}}
音乐播放器：
public int[] bname=new int[]{R.drawable.playinv, R.drawable.pausex, R.drawable.pauseinv, R.drawable.playx,
R.drawable.nextinv, R.drawable.nextx, R.drawable.previousinv, R.drawable.previousx, R.drawable.vdowninv,
R.drawable.vdownx, R.drawable.vupinv, R.drawable.vupx};
private Map<UUID, BluetoothGattCharacteristic> map = new HashMap<UUID, BluetoothGattCharacteristic>();
private final ServiceConnection mServiceConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName componentName,
IBinder service) {
mBluetoothLeService = ((RBLService.LocalBinder) service)
.getService();
if (!mBluetoothLeService.initialize()) {
Log.e(TAG, "Unable to initialize Bluetooth");
finish();
}
// Automatically connects to the device upon successful start-up
// initialization.
final Handler handler =new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
mBluetoothLeService.connect(mDeviceAddress);
}
},2000);
}
@Override
public void onServiceDisconnected(ComponentName componentName) {
mBluetoothLeService = null;
}
};
private final BroadcastReceiver mGattUpdateReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if (RBLService.ACTION_GATT_DISCONNECTED.equals(action)) {
} else if (RBLService.ACTION_GATT_SERVICES_DISCOVERED
.equals(action)) {
getGattService(mBluetoothLeService.getSupportedGattService());
} else if (RBLService.ACTION_DATA_AVAILABLE.equals(action)) {
displayData(intent.getByteArrayExtra(RBLService.EXTRA_DATA));
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.music_player);
checkperms();
vup= findViewById(R.id.vup);
vdown=findViewById(R.id.vdown);
next =findViewById(R.id.next);
previous= findViewById(R.id.previous);
playpause =findViewById(R.id.plpau);
info=findViewById(R.id.textView);
tload=findViewById(R.id.load);
audioManager=(AudioManager)getApplicationContext().getSystemService(Context.AUDIO_SERVICE);
Toast.makeText(getApplicationContext(),"Android Version: "+Build.VERSION.SDK_INT, Toast.LENGTH_LONG).show();
// mediaPlayer = MediaPlayer.create(getApplicationContext(), tracks[current]);
tload.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
getSongs();
MUSIC_LOADED=1;
info.setText(songT[current]);
Uri trackUri = ContentUris.withAppendedId(
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,songIDS[current]);
mediaPlayer=MediaPlayer.create(getApplicationContext(), trackUri);
}
});
playpause.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (pp) {
mediaPlayer.start();
playpause.setBackgroundResource(R.drawable.pausex);
pp = FALSE;
} else {
mediaPlayer.pause();
playpause.setBackgroundResource(R.drawable.playx);
pp = TRUE;}
}});
next.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
nextTrack();
} });
previous.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
previousTrack();
} });
vdown.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
volumeDown(audioManager);
}});
vup.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
volumeUp(audioManager); }});
Intent intent = getIntent();
mDeviceAddress = intent.getStringExtra(Device.EXTRA_DEVICE_ADDRESS);
mDeviceName = intent.getStringExtra(Device.EXTRA_DEVICE_NAME);
// getActionBar().setTitle(mDeviceName);
// getActionBar().setDisplayHomeAsUpEnabled(true);
Intent gattServiceIntent = new Intent(this, RBLService.class);
bindService(gattServiceIntent, mServiceConnection, BIND_AUTO_CREATE);
}
@Override
protected void onResume() {
super.onResume();
registerReceiver(mGattUpdateReceiver, makeGattUpdateIntentFilter());
//mediaPlayer.stop();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == android.R.id.home) {
mBluetoothLeService.disconnect();
mBluetoothLeService.close();
// mediaPlayer.stop();
System.exit(0);
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onStop() {
super.onStop();
unregisterReceiver(mGattUpdateReceiver);
//mediaPlayer.stop();
}
@Override
protected void onDestroy() {
super.onDestroy();
mBluetoothLeService.disconnect();
mBluetoothLeService.close();
//mediaPlayer.stop();
System.exit(8);
}
private void displayData(byte[] byteArray) {
if (MUSIC_LOADED==1){
if (byteArray != null) {
String data = new String(byteArray);
x= data.substring (data.length()-1);
//Toast.makeText(getApplicationContext(),x,Toast.LENGTH_SHORT).show();
if (x.equals("1")){
selector=10;
colorChange(vup,selector);
Toast.makeText(getApplicationContext(),"Infitex_keypress_001"+"\n"+ "Volume up",Toast.LENGTH_SHORT).show();
volumeUp(audioManager);
}
if (x.equals("3")){
selector=4;
colorChange(next,selector);
Toast.makeText(getApplicationContext(),"Infitex_keypress_003"+"\n"+ "Track Advance",Toast.LENGTH_SHORT).show();
nextTrack();
}
if (x.equals("5") ){
if (pp){
selector=0;} else selector= 2;
colorChange(playpause,selector);
Toast.makeText(getApplicationContext(),"Infitex_keypress_005"+"\n"+ "Play/Pause",Toast.LENGTH_SHORT).show();
playPause(playpause);}
if(x.equals("7")){
selector=6;
colorChange(previous,selector);
Toast.makeText(getApplicationContext(),"Infitex_keypress_007"+"\n"+ "Track Reverse",Toast.LENGTH_SHORT).show();
previousTrack();
}
if(x.equals("9")){
selector=8;
colorChange(vdown,selector);
Toast.makeText(getApplicationContext(),"Infitex_keypress_009"+"\n"+ "Volume Down",Toast.LENGTH_SHORT).show();
volumeDown(audioManager);
}
}}}
private void getGattService(BluetoothGattService gattService) {
if (gattService == null)
return;
BluetoothGattCharacteristic characteristic = gattService
.getCharacteristic(RBLService.UUID_BLE_SHIELD_TX);
map.put(characteristic.getUuid(), characteristic);
BluetoothGattCharacteristic characteristicRx = gattService
.getCharacteristic(RBLService.UUID_BLE_SHIELD_RX);
mBluetoothLeService.setCharacteristicNotification(characteristicRx,
true);
mBluetoothLeService.readCharacteristic(characteristicRx);
}
private static IntentFilter makeGattUpdateIntentFilter() {
final IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(RBLService.ACTION_GATT_CONNECTED);
intentFilter.addAction(RBLService.ACTION_GATT_DISCONNECTED);
intentFilter.addAction(RBLService.ACTION_GATT_SERVICES_DISCOVERED);
intentFilter.addAction(RBLService.ACTION_DATA_AVAILABLE);
return intentFilter;
}
void nextTrack(){
mediaPlayer.pause();
current+=1;
if (current==5){
current=0;
}
getURI();
info.setText(songT[current]);
playpause.setBackgroundResource(R.drawable.pausex);
mediaPlayer.start();
pp=FALSE;
}
void previousTrack(){
mediaPlayer.pause();
if (current==0){
current=4;}
else {
current -= 1;
}
getURI();
info.setText(songT[current]);
playpause.setBackgroundResource(R.drawable.pausex);
mediaPlayer.start();
pp=FALSE;
}
public void playPause(ImageButton imageButton){
if (pp) {
mediaPlayer.start();
imageButton.setBackgroundResource(R.drawable.pausex);
pp = FALSE;
} else if(pp==FALSE) {
mediaPlayer.pause();
imageButton.setBackgroundResource(R.drawable.playx);
pp = TRUE;
}
}
public void volumeDown(AudioManager audioManager){
audioManager.adjustVolume(AudioManager.ADJUST_LOWER,AudioManager.FLAG_PLAY_SOUND);
}
public void volumeUp(AudioManager audioManager){
audioManager.adjustVolume(AudioManager.ADJUST_RAISE,AudioManager.FLAG_PLAY_SOUND);
}
public void colorChange(final ImageButton imageButton, final int name){
final int last= name+1;
new CountDownTimer(1500, 1000) {
public void onTick(long millisUntilFinished) {
imageButton.setBackgroundResource(bname[name]);
}
public void onFinish() {
imageButton.setBackgroundResource(bname[last]);
}
}.start();
}
// public void bCheck(ImageButton imageButton){
public void getSongs(){
int i=0;
ContentResolver contentResolver=getContentResolver();
Uri uri= EXTERNAL_CONTENT_URI;
Cursor songcursor= contentResolver.query(uri,null,null,null,null);
if (songcursor!=null && songcursor.moveToFirst()) {
int songtitle=songcursor.getColumnIndex(MediaStore.Audio.Media.TITLE);
int songID=songcursor.getColumnIndex(MediaStore.Audio.Media._ID);
do{
songT[i] = songcursor.getString(songtitle);
songIDS[i]=songcursor.getLong(songID);
i+=1;
}
while(songcursor.moveToNext());
songcursor.close();
}}
public void getURI(){
Uri trackUri = ContentUris.withAppendedId(
android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,songIDS[current]);
mediaPlayer=MediaPlayer.create(getApplicationContext(), trackUri);
}
private void checkperms(){
//Toast.makeText(this,"version", Toast.LENGTH_LONG);
if(Build.VERSION.SDK_INT>19) {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED){
Toast.makeText(getApplicationContext(), "permissions not granted", Toast.LENGTH_SHORT)
.show();
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.READ_EXTERNAL_STORAGE))
Toast.makeText(getApplicationContext(),"pls grant permissions", Toast.LENGTH_SHORT)
.show();
else {
// No explanation needed; request the permission
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
MainActivity.permconst);
}
}}}
}
和logcat：
com.example.parlatas.messages I/AndroidRuntime: VM exiting with result code 0, cleanup skipped.
I / WindowManager：WIN DEATH：Window {9297a52 u0 com.example.parlatas.messages / com.example.parlatas.messages.MainActivity} I / ActivityManager：进程com.example.parlatas.messages（pid 8530）已经死亡：前TOP W / ActivityManager：强制删除ActivityRecord {b15576d u0 com.example.parlatas.messages / .MusicPlayer t245}：app死了，没有保存状态 W / InputDispatcher：channel＆＃39; d7b3552 com.example.parlatas.messages / com.example.parlatas.messages.MusicPlayer（server）＆＃39; 〜消费者关闭输入通道或发生错误。事件= 0x9 E / InputDispatcher：channel＆＃39; d7b3552 com.example.parlatas.messages / com.example.parlatas.messages.MusicPlayer（server）＆＃39; 〜频道不可挽回地被打破，将被处置！ I / WindowManager：WIN DEATH：Window {d7b3552 u0 com.example.parlatas.messages / com.example.parlatas.messages.MusicPlayer} W / InputDispatcher：尝试取消注册已经未注册的输入频道＆＃39; d7b3552 com.example.parlatas.messages / com.example.parlatas.messages.MusicPlayer（server）＆＃39; W / NotificationService：对象死于尝试隐藏com.example.parlatas.messages包中的通知android.app.ITransientNotification$Stub$Proxy@c10b00c
我有单独的类，其中包含BLE常量和蓝牙设备列表，该列表由扫描活动（主要活动）填充
答案 0 :(得分：0)
如果要定位的API级别高于22，请尝试在清单中添加以下权限。如果要使用蓝牙硬件，则需要使用粗略位置权限（访问蜂窝位置信息）。它没有意义，但在新API级别中需要它。
classNamePrefix然后，您必须提供权限，或者应该定位较低的API级别。
答案 1 :(得分：0)