所以我有这个类有5个按钮的处理程序。它们应该运行两次线程并从另一个类调用一个函数。但是，当我点击它们时，它们什么都不做。当用户点击按钮时，我缺少什么才能使按钮工作？
我定义处理程序的类：
function asyncFoo() {
const p = asyncAction();
p.reflect().then(inspection => {
console.log('promise p fulfilled %s', inspection.isFulfilled());
});
return p;
}
具有按钮应该调用的函数的类：
package com.example.michael.bluetoothcontroll;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.util.Set;
import java.util.UUID;
import java.lang.Runnable;
public class control extends ActionBarActivity {
BluetoothDevice mmDevice;
blueToothControl bt = new blueToothControl();
@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_control, 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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
// Define the Handler that receives messages from the thread and update the progress
@Override
public void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_control);
final Button fwd = (Button) findViewById(R.id.FWD);
final Button rev = (Button) findViewById(R.id.REV);
final Button left = (Button) findViewById(R.id.Left);
final Button right = (Button) findViewById(R.id.Right);
final Button start = (Button) findViewById(R.id.settings);
/**
*
* render thread
* used to update the UI
*
*/
final class render implements Runnable {
// what to send to the TextView
public String message;
// constructor
public render(String msg){
message = msg;
}
public void run(){
setContentView(R.layout.activity_control);
TextView tv = (TextView) findViewById(R.id.confirm);
tv.setText(message);
}
}
/**
*
* button handlers
*
* */
//start start button handler
start.setOnClickListener(new View.OnClickListener(){
public void onClick(View v)
{
bt.callConnectThread(mmDevice);
}
});
//end start button handler
// start fwd button handler
fwd.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
String test = bt.callWorkThread("fwd");
(new Thread(new render("sending fwd \n"))).start();
(new Thread(new render(test))).start();
}
});
//end fwd button handler
//start left on button handler
left.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
(new Thread(new render("sending left \n"))).start();
(new Thread(new render(bt.callWorkThread("left")))).start();
}
});
//end left button handler
//start right button handler
right.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
(new Thread(new render("sending right \n"))).start();
(new Thread(new render(bt.callWorkThread("right")))).start();
}
});
// end right button handler
//start reverse button handler
rev.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
(new Thread(new render("sending rev \n"))).start();
(new Thread(new render(bt.callWorkThread("rev")))).start();
}
});
// end reverse button handler
/**
*
* check on bluetooth adapter
*
*/
BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if(mBluetoothAdapter != null) {
if (!mBluetoothAdapter.isEnabled()) {
Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBluetooth, 0);
}
Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
if (pairedDevices.size() > 0) {
for (BluetoothDevice device : pairedDevices) {
if (device.getName().equals("raspberrypi")) //Note, you will need to change this to match the name of your device
{
Log.e("Robo", device.getName());
mmDevice = device;
break;
}
}
}
} else{
// failed send the response to user
(new Thread(new render("Error: could not find device \n"))).start();
}
}
}
主要活动的我的xml：
package com.example.michael.bluetoothcontroll;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import java.io.IOException;
import java.io.OutputStream;
import java.util.UUID;
/**
* responsible for all bluetooth threads
*/
public class blueToothControl {
BluetoothSocket mmSocket;
String connectionConfirmation;
String workConfirmation;
/**
*
* connect thread
* to establish the bluetooth socket
*/
final class connectThread implements Runnable{
BluetoothDevice mmDevice;
public connectThread(BluetoothDevice Device){
mmDevice = Device;
}
@Override
public void run() {
// try and connect to pi
connectBT(mmDevice);
}
}
/**
*
* workerThread
* for sending data over the bluetooth socket
*
*/
final class workerThread implements Runnable {
private String btMsg;
public workerThread(String msg) {
// chars that get sent to the pi
btMsg = msg;
}
public void run()
{
try {
if(mmSocket != null) {
OutputStream mmOutputStream = mmSocket.getOutputStream();
mmOutputStream.write(btMsg.getBytes());
workConfirmation = "sent \n >";
}else{
workConfirmation = "Error: failed to send" + btMsg + "\n > ";
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* connectBT
* @param mmDevice
* takes the device and trys to create a socket with it
*/
protected void connectBT(BluetoothDevice mmDevice) {
//UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb"); //Standard SerialPortService ID
final UUID uuid = UUID.fromString("94f39d29-7d6d-437d-973b-fba39e49d4ee"); //Standard SerialPortService ID
try {
if(mmDevice != null) {
mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);
if (!mmSocket.isConnected()) {
mmSocket.connect();
}
}else{
connectionConfirmation = "Error: failed to connect to device \n >";
}
} catch (IOException e) {
e.printStackTrace();
}
}
// this function never runs when I click
protected String callConnectThread(BluetoothDevice Device){
(new Thread(new connectThread(Device))).start();
return connectionConfirmation;
}
// this function never runs
protected String callWorkThread(String msg){
(new Thread(new workerThread(msg))).start();
return workConfirmation;
}
}
我认为这与不属于同一类的功能有关，但我可能会错，任何帮助都会非常感激
答案 0 :(得分：0)
你在哪里调用render？
另外，在你的xml中，做android：onclick = functionName，它是一个更好的，更好的方式来确保你的按钮监听器被调用
答案 1 :(得分：0)
您需要添加
android:onClick="whatevermethodthatbuttonisconnectedtoo"
答案 2 :(得分：0)
答案可以在我提问的评论中看到。 Mike.M建议只调用setContentView()一次并取出渲染线程。当我这样做时，应用程序工作。