我遵循this教程，但它不起作用。我的蓝牙插座没有连接。这是我的代码：
package com.levoto.hm.bt;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.ParcelUuid;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import java.io.IOException;
import java.sql.Time;
import java.util.Set;
import java.util.UUID;
public class MainActivity extends AppCompatActivity {
private BluetoothAdapter bluetoothAdapter;
private BluetoothDevice bluetoothLED;
private ImageView imageView;
private TextView notification;
private Button ON;
private Button OFF;
private BluetoothSocket mmsoket;
private boolean flag = true;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView = (ImageView) findViewById(R.id.imageView);
notification = (TextView) findViewById(R.id.notification_view);
ON = (Button) findViewById(R.id.buttonON);
OFF = (Button) findViewById(R.id.buttonOFF);
bluetoothLED = null;
bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if(bluetoothAdapter == null) {
makeMsg("No adapter found.");
finish();
}
if(!bluetoothAdapter.isEnabled()) {
Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(intent, 1);
}
Set<BluetoothDevice> deviceSet = bluetoothAdapter.getBondedDevices();
if (deviceSet.size() == 0) {
makeMsg("No paired device found.\n Please pair first");
finish();
}
for(BluetoothDevice device : deviceSet) {
if(device.getName().equals("HM LED")) {
makeMsg("Bluetooth led found");
bluetoothLED = device;
break;
}
}
if(bluetoothLED == null) {
makeMsg("BT LED is not found among the paired devices please");
finish();
}
makeNoitification("Starting connection.");
mmsoket = null;
int count = 1;
while(mmsoket == null) {
try{
mmsoket = bluetoothLED.createInsecureRfcommSocketToServiceRecord(UUID.randomUUID());
makeNoitification("Connecting");
mmsoket.connect();
makeNoitification("Connected!");
} catch (IOException e) {
makeNoitification("Failed to connect.");
try {
mmsoket.close();
mmsoket = null;
} catch (IOException e1) {
mmsoket = null;
}
}
count++;
if(count == 10) {
flag = false;
break;
}
}
if (flag){
}
if(flag){
ON.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()){
case MotionEvent.ACTION_DOWN:
ON.setAlpha(.5f);
break;
case MotionEvent.ACTION_UP:
ON.setAlpha(1f);
imageView.setImageResource(R.drawable.on_ic);
makeNoitification("Led turned on.");
break;
default:
break;
}
return false;
}
});
OFF.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()){
case MotionEvent.ACTION_DOWN:
OFF.setAlpha(.5f);
break;
case MotionEvent.ACTION_UP:
OFF.setAlpha(1f);
imageView.setImageResource(R.drawable.off_ic);
makeNoitification("Led turned off.");
break;
default:
break;
}
return false;
}
});}else {
OFF.setAlpha(.5f);
ON.setAlpha(.5f);
}
}
private void makeMsg(String s) {
Toast.makeText(this,s,Toast.LENGTH_SHORT).show();
}
private void makeNoitification(String s) {
notification.setText(String.format(s));
}
@Override
protected void onDestroy() {
super.onDestroy();
}
}
当我使用上面的代码时，套接字没有连接，但程序有效，但如果我更改了行：
bluetoothLED.createInsecureRfcommSocketToServiceRecord(UUID.randomUUID());
要：
bluetoothLED.createInsecureRfcommSocketToServiceRecord(UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
该计划不再响应。
LogCat显示：
06-13 21:37:46.167 31812-31812/? I/art: Late-enabling -Xcheck:jni
06-13 21:37:46.311 31812-31812/com.levoto.hm.btled W/art: Failed execv(/system/bin/dex2oat --runtime-arg -classpath --runtime-arg --debuggable --instruction-set=arm64 --instruction-set-features=smp,a53 --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --instruction-set-variant=generic --instruction-set-features=default --dex-file=/data/app/com.levoto.hm.btled-1/split_lib_dependencies_apk.apk --oat-file=/data/dalvik-cache/arm64/data@app@com.levoto.hm.btled-1@split_lib_dependencies_apk.apk@classes.dex) because non-0 exit status
06-13 21:37:46.519 31812-31812/com.levoto.hm.btled W/art: Failed execv(/system/bin/dex2oat --runtime-arg -classpath --runtime-arg --debuggable --instruction-set=arm64 --instruction-set-features=smp,a53 --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --instruction-set-variant=generic --instruction-set-features=default --dex-file=/data/app/com.levoto.hm.btled-1/split_lib_slice_0_apk.apk --oat-file=/data/dalvik-cache/arm64/data@app@com.levoto.hm.btled-1@split_lib_slice_0_apk.apk@classes.dex) because non-0 exit status
06-13 21:37:46.568 31812-31812/com.levoto.hm.btled W/art: Failed execv(/system/bin/dex2oat --runtime-arg -classpath --runtime-arg --debuggable --instruction-set=arm64 --instruction-set-features=smp,a53 --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --instruction-set-variant=generic --instruction-set-features=default --dex-file=/data/app/com.levoto.hm.btled-1/split_lib_slice_1_apk.apk --oat-file=/data/dalvik-cache/arm64/data@app@com.levoto.hm.btled-1@split_lib_slice_1_apk.apk@classes.dex) because non-0 exit status
06-13 21:37:46.612 31812-31812/com.levoto.hm.btled W/art: Failed execv(/system/bin/dex2oat --runtime-arg -classpath --runtime-arg --debuggable --instruction-set=arm64 --instruction-set-features=smp,a53 --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --instruction-set-variant=generic --instruction-set-features=default --dex-file=/data/app/com.levoto.hm.btled-1/split_lib_slice_2_apk.apk --oat-file=/data/dalvik-cache/arm64/data@app@com.levoto.hm.btled-1@split_lib_slice_2_apk.apk@classes.dex) because non-0 exit status
06-13 21:37:46.657 31812-31812/com.levoto.hm.btled W/art: Failed execv(/system/bin/dex2oat --runtime-arg -classpath --runtime-arg --debuggable --instruction-set=arm64 --instruction-set-features=smp,a53 --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --instruction-set-variant=generic --instruction-set-features=default --dex-file=/data/app/com.levoto.hm.btled-1/split_lib_slice_3_apk.apk --oat-file=/data/dalvik-cache/arm64/data@app@com.levoto.hm.btled-1@split_lib_slice_3_apk.apk@classes.dex) because non-0 exit status
06-13 21:37:46.699 31812-31812/com.levoto.hm.btled W/art: Failed execv(/system/bin/dex2oat --runtime-arg -classpath --runtime-arg --debuggable --instruction-set=arm64 --instruction-set-features=smp,a53 --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --instruction-set-variant=generic --instruction-set-features=default --dex-file=/data/app/com.levoto.hm.btled-1/split_lib_slice_4_apk.apk --oat-file=/data/dalvik-cache/arm64/data@app@com.levoto.hm.btled-1@split_lib_slice_4_apk.apk@classes.dex) because non-0 exit status
06-13 21:37:46.741 31812-31812/com.levoto.hm.btled W/art: Failed execv(/system/bin/dex2oat --runtime-arg -classpath --runtime-arg --debuggable --instruction-set=arm64 --instruction-set-features=smp,a53 --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --instruction-set-variant=generic --instruction-set-features=default --dex-file=/data/app/com.levoto.hm.btled-1/split_lib_slice_5_apk.apk --oat-file=/data/dalvik-cache/arm64/data@app@com.levoto.hm.btled-1@split_lib_slice_5_apk.apk@classes.dex) because non-0 exit status
06-13 21:37:46.783 31812-31812/com.levoto.hm.btled W/art: Failed execv(/system/bin/dex2oat --runtime-arg -classpath --runtime-arg --debuggable --instruction-set=arm64 --instruction-set-features=smp,a53 --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --instruction-set-variant=generic --instruction-set-features=default --dex-file=/data/app/com.levoto.hm.btled-1/split_lib_slice_6_apk.apk --oat-file=/data/dalvik-cache/arm64/data@app@com.levoto.hm.btled-1@split_lib_slice_6_apk.apk@classes.dex) because non-0 exit status
06-13 21:37:46.824 31812-31812/com.levoto.hm.btled W/art: Failed execv(/system/bin/dex2oat --runtime-arg -classpath --runtime-arg --debuggable --instruction-set=arm64 --instruction-set-features=smp,a53 --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --instruction-set-variant=generic --instruction-set-features=default --dex-file=/data/app/com.levoto.hm.btled-1/split_lib_slice_7_apk.apk --oat-file=/data/dalvik-cache/arm64/data@app@com.levoto.hm.btled-1@split_lib_slice_7_apk.apk@classes.dex) because non-0 exit status
06-13 21:37:46.865 31812-31812/com.levoto.hm.btled W/art: Failed execv(/system/bin/dex2oat --runtime-arg -classpath --runtime-arg --debuggable --instruction-set=arm64 --instruction-set-features=smp,a53 --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --instruction-set-variant=generic --instruction-set-features=default --dex-file=/data/app/com.levoto.hm.btled-1/split_lib_slice_8_apk.apk --oat-file=/data/dalvik-cache/arm64/data@app@com.levoto.hm.btled-1@split_lib_slice_8_apk.apk@classes.dex) because non-0 exit status
06-13 21:37:46.906 31812-31812/com.levoto.hm.btled W/art: Failed execv(/system/bin/dex2oat --runtime-arg -classpath --runtime-arg --debuggable --instruction-set=arm64 --instruction-set-features=smp,a53 --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --instruction-set-variant=generic --instruction-set-features=default --dex-file=/data/app/com.levoto.hm.btled-1/split_lib_slice_9_apk.apk --oat-file=/data/dalvik-cache/arm64/data@app@com.levoto.hm.btled-1@split_lib_slice_9_apk.apk@classes.dex) because non-0 exit status
06-13 21:37:46.908 31812-31812/com.levoto.hm.btled W/System: ClassLoader referenced unknown path: /data/app/com.levoto.hm.btled-1/lib/arm64
06-13 21:37:46.913 31812-31812/com.levoto.hm.btled I/InstantRun: starting instant run server: is main process
06-13 21:37:47.226 31812-31812/com.levoto.hm.btled I/Process: Sending signal. PID: 31812 SIG: 9