Java Android Studio应用程序未连接到蓝牙设备
我正在尝试将我的应用程序连接到Arduino蓝牙模块。 如果我点击列表中的一个项目,什么都不会发生。甚至没有错误消息。有人能帮忙吗?我不知道为什么什么事都没有发生。 下面是我的代码,我希望这是所有你需要的 MainActivity.java:Java Android Studio应用程序未连接到蓝牙设备,java,android,android-studio,bluetooth,android-bluetooth,Java,Android,Android Studio,Bluetooth,Android Bluetooth,我正在尝试将我的应用程序连接到Arduino蓝牙模块。 如果我点击列表中的一个项目,什么都不会发生。甚至没有错误消息。有人能帮忙吗?我不知道为什么什么事都没有发生。 下面是我的代码,我希望这是所有你需要的 MainActivity.java: package com.car.bluetooth.bluetoothcar; import android.bluetooth.BluetoothAdapter; import android.content.Intent; import androi
package com.car.bluetooth.bluetoothcar;
import android.bluetooth.BluetoothAdapter;
import android.content.Intent;
import android.os.Bundle;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.snackbar.Snackbar;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.CheckBox;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//MENÜPUNKTE
if (id == R.id.action_settings) {
Intent settingsintent = new Intent(MainActivity.this,
settingsactivity.class);
startActivity(settingsintent);
return false;
}
if (id == R.id.action_connect) {
Intent connectintent = new Intent(MainActivity.this,
connectactivity.class);
startActivity(connectintent);
return false;
}
return super.onOptionsItemSelected(item);
}
//SeekBars
private SeekBar seekBarGas;
private TextView textViewGas;
private SeekBar seekBarSteering;
private TextView textViewSteering;
private CheckBox backwards_checkBox;
boolean rückwärts_var = false;
boolean safeMode;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();
seekBarGas = (SeekBar) findViewById(R.id.seekBarGas);
textViewGas = (TextView) findViewById(R.id.textViewGas);
seekBarGas.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
textViewGas.setText(progress + " / " + seekBarGas.getMax());
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
seekBarGas.setProgress(0);
}
});
seekBarSteering = (SeekBar) findViewById(R.id.seekBarSteering);
textViewSteering = (TextView) findViewById(R.id.textViewSteering);
seekBarSteering.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
textViewSteering.setText(progress + " / " + seekBarSteering.getMax());
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
seekBarSteering.setProgress(3);
}
});
//GET DATA Settings
Intent safeMode_Intent = getIntent();
safeMode = safeMode_Intent.getBooleanExtra("safeMode", false);
//Rückwärts
CheckBox backwards_checkBox=(CheckBox)findViewById(R.id.backwards_checkBox);
backwards_checkBox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (((CheckBox)v).isChecked()) {
Toast.makeText(getApplicationContext(), "Rückwärts", Toast.LENGTH_SHORT).show();
rückwärts_var = true;
if (safeMode == true) {
seekBarGas.setMax(2);
}
}
else{
Toast.makeText(getApplicationContext(), "Vorwärts", Toast.LENGTH_SHORT).show();
rückwärts_var = false;
if (safeMode == true){
seekBarGas.setMax(5);
}
}
}
});
//Bluetooth
if (btAdapter == null){
Toast.makeText(getApplicationContext(), "Bluetooth wird auf diesem Gerät nicht unterstützt", Toast.LENGTH_LONG).show();
}
}
}
BT_Classic.java:
package com.car.bluetooth.bluetoothcar;
import androidx.appcompat.app.AppCompatActivity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.Set;
public class BT_Classic extends AppCompatActivity {
private Button pairedButton;
private Button discoveredButton;
private Button btonButton;
private Button btoffButton;
ListView list;
private static final int REQUEST_ENABLED = 0;
private static final int REQUEST_DISCOVERABLE = 0;
BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bt__classic);
pairedButton = (Button) findViewById(R.id.pairedButton);
discoveredButton = (Button) findViewById(R.id.discoveredButton);
btonButton = (Button) findViewById(R.id.btonButton);
btoffButton = (Button) findViewById(R.id.btoffButton);
list = (ListView) findViewById(R.id.list) ;
//Pairing Button
pairedButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Set<BluetoothDevice> pairedDevices = btAdapter.getBondedDevices();
ArrayList<String> devices = new ArrayList<String>();
for (BluetoothDevice bt : pairedDevices){
devices.add(bt.getName());
}
ArrayAdapter arrayAdapter = new ArrayAdapter(BT_Classic.this, android.R.layout.simple_list_item_1, devices);
list.setAdapter(arrayAdapter);
}
});
discoveredButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(!btAdapter.isDiscovering()){
Intent bton = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
startActivityForResult(bton, REQUEST_DISCOVERABLE);
}
}
});
btonButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent bton = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(bton, REQUEST_ENABLED);
}
});
btoffButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
btAdapter.disable();
}
});
}
}
我猜你在谈论BT_经典活动中的列表 没有任何事情发生,因为你没有对它进行设置和操作。大概是这样的:
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
}
});
list.setOnItemClickListener(新的AdapterView.OnItemClickListener(){
@凌驾
public void onItemClick(AdapterView父对象、视图、整型位置、长id){
}
});
谢谢,你知道我要放在括号里的是什么吗?我对这一切都很陌生,找不到任何容易理解的信息。你需要在其中输入的是当用户选择列表中的某个项目时要执行的操作。参数int position
表示用户在列表中选择的位置。您能帮我写下这些行吗?我不知道如何解决这个问题,我在网上浏览了至少8个小时,试图找到一个可行的解决方案。没有成功。问题是,这不是一个问题。。。进去的东西取决于你在做什么。我不知道你在做什么/想做什么我只想连接到我点击的设备。。。就这样
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.car.bluetooth.bluetoothcar"
minSdkVersion '16'
targetSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.0.0-beta01'
implementation 'android.arch.navigation:navigation-fragment:1.0.0-alpha05'
implementation 'android.arch.navigation:navigation-ui:1.0.0-alpha05'
implementation 'androidx.constraintlayout:constraintlayout:1.1.2'
implementation 'com.google.android.material:material:1.0.0-beta01'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test:runner:1.1.0-alpha4'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0-alpha4'
}
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
}
});