安卓编程线程更改textview 的问题

整型变量 2014-07-10 10:49:41

程序运行后，线程只能更改一次 textview4的值。如果再次更改textview4.的值就程序崩溃。请问高手，这个怎么回事啊

handler = new Handler(){
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
String message = (String)msg.obj;
Log.d("asfasfd",String.valueOf(msg.what));
textView4.setText(message);
super.handleMessage(msg);
}

};

class inputlisner extends Thread{
@Override
public void run() {
// TODO Auto-generated method stub
Message message = Message.obtain();
int bytes = 0;
while(true)
{
try{

inputStream = bluetoothSocket.getInputStream();
bytes = inputStream.read();
message.obj = String.valueOf(bytes-48);

}catch (Exception e) {
// TODO: handle exception
}
handler.sendMessage(message);
}
}
}

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整型变量 2014-07-10

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解决了谢谢 birdsaction

Birds2018 2014-07-10

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我看是消息队列的问题。你把 Message message = Message.obtain(); 这个代码放到while循环里面试试。

整型变量 2014-07-10

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package com.example.bluetoothtest; import java.io.InputStream; import java.io.OutputStream; import java.util.Random; import java.util.Set; import android.R.integer; import android.support.v7.app.ActionBarActivity; import android.support.v7.app.ActionBar; import android.support.v4.app.Fragment; import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.bluetooth.BluetoothServerSocket; import android.bluetooth.BluetoothSocket; import android.content.DialogInterface; import android.content.DialogInterface.OnClickListener; import android.content.Intent; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.util.Log; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.TextView; import android.os.Build; import java.util.UUID; public class MainActivity extends ActionBarActivity { private Button button; private BluetoothAdapter bluetoothAdapter; private BluetoothDevice bluetoothDevice; private BluetoothSocket bluetoothSocket; private BluetoothServerSocket bluetoothServerSocket; private TextView textView1; private TextView textView2; private TextView textView3; private TextView textView4; private UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); private OutputStream outputStream; private InputStream inputStream; private Thread thread; private Handler handler; private final Random mGenerator = new Random(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (savedInstanceState == null) { getSupportFragmentManager().beginTransaction() .add(R.id.container, new PlaceholderFragment()).commit(); } } @Override public boolean onCreateOptionsMenu(Menu menu) { handler = new Handler(){ @Override public void handleMessage(Message msg) { // TODO Auto-generated method stub String message = (String)msg.obj; Log.d("asfasfd",String.valueOf(msg.what)); textView4.setText(message); } }; button = (Button)findViewById(R.id.button1); textView1 = (TextView)findViewById(R.id.textView1); textView2 = (TextView)findViewById(R.id.textView2); textView3 = (TextView)findViewById(R.id.textView3); textView4 = (TextView)findViewById(R.id.textView4); textView4.setText("asdfasdfasfd"); thread = new Thread(new inputlisner()); button.setOnClickListener(new buttonlisner()); bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); if(!bluetoothAdapter.enable()) { Intent intent = new Intent(bluetoothAdapter.ACTION_REQUEST_ENABLE); startActivityForResult(intent, 0x1); }else { Set<BluetoothDevice> deviceaddress = bluetoothAdapter.getBondedDevices(); if(deviceaddress.size() < 0 ) { textView1.setText("没有匹配的设备，请进行匹配"); }else { textView1.setText("匹配设备成功1"); try{ textView2.setText("远端舍必获取地址成功"); bluetoothDevice = bluetoothAdapter.getRemoteDevice(deviceaddress.iterator().next().getAddress()); }catch (Exception e) { // TODO: handle exception textView2.setText("获取地址失败"); } try{ bluetoothSocket = bluetoothDevice.createRfcommSocketToServiceRecord(uuid); textView3.setText("创建串口端口成功"); }catch (Exception e) { textView3.setText("创建串口端口失败"); // TODO: handle exception } try{ bluetoothSocket.connect(); textView3.setText("设备链接成功"); }catch (Exception e) { textView3.setText("设备链接失败"); // TODO: handle exception } } } // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.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(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } /** * A placeholder fragment containing a simple view. */ class buttonlisner implements OnClickListener, android.view.View.OnClickListener{ @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub } @Override public void onClick(View v) { // TODO Auto-generated method stub if(!thread.isAlive()){ thread.start(); }//判断现成是否存活或者开启 try{ outputStream = bluetoothSocket.getOutputStream(); byte[] buffer; String message = "1"; buffer = message.getBytes(); outputStream.write(buffer); }catch (Exception e) { // TODO: handle exception } } } class inputlisner extends Thread{ @Override public void run() { // TODO Auto-generated method stub Message message = Message.obtain(); int bytes = 0; while(true) { try{ inputStream = bluetoothSocket.getInputStream(); bytes = inputStream.read(); message.obj = String.valueOf(bytes-48); }catch (Exception e) { // TODO: handle exception } handler.sendMessage(message); } } } public static class PlaceholderFragment extends Fragment { public PlaceholderFragment() { } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_main, container, false); return rootView; } } }

整型变量 2014-07-10