尝试接收广播时，我正在发现StackOverflowError 我假设这个错误是由于广播发送的次数而产生的，但是当我尝试获取我正在广播的活动的上下文时它会抛出错误。我也会发布我的代码。
感谢您的帮助！
D/Error: ERR: stack=java.lang.StackOverflowError: stack size 8MB
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairbanks_01.InputActivity.getContext(InputActivity.java:56)
at com.example.curie.fairba
ERR: TOTAL BYTES WRITTEN: 1447748
这是进行连接并广播它的程序。
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.support.v4.content.LocalBroadcastManager;
import android.util.Log;
import android.widget.Toast;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.util.Scanner;
import java.util.UUID;
// import org.apache.commons.io.IOUtils;
public class BluetoothConnection extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
byte[] buffer;
BluetoothAdapter mmAdapter;
public static String output = "ABC";
// Unique UUID for this application, you may use different
private static UUID MY_UUID ;
public BluetoothConnection(BluetoothDevice device) {
UUID MY_UUID = device.getUuids()[0].getUuid();
BluetoothSocket tmp = null;
mmAdapter = null;
System.out.println("$$$$$$$$$$$$$$$$****** in constructor ******$$$$$$$$$$$$$$$$");
// Get a BluetoothSocket for a connection with the given BluetoothDevice
try {
tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) {
e.printStackTrace();
}
mmSocket = tmp;
//now make the socket connection in separate thread to avoid FC
Thread connectionThread = new Thread(new Runnable() {
@Override
public void run() {
// Always cancel discovery because it will slow down a connection
Log.d("workkkkkk","$$$$$$$$$$$$$$$$****** printingggggg ******$$$$$$$$$$$$$$$$");
//mmAdapter.cancelDiscovery();
// Make a connection to the BluetoothSocket
// try {
// // This is a blocking call and will only return on a
// // successful connection or an exception
// mmSocket.connect();
//
//
// System.out.println("\n\n\n\n\n\n socket connected\n\n\n\n\n\n");
//
// } catch (IOException e) {
// //connection to device failed so close the socket
// try {
// mmSocket.close();
// System.out.println("\n\n\n\n\n\n socket closed\n\n\n\n\n\n");
//
// } catch (IOException e2) {
// System.out.println("\n\n\n\n\n\n in catch\n\n\n\n\n\n");
//
// e2.printStackTrace();
// }
// }
}
});
connectionThread.start();
InputStream tmpIn = null;
OutputStream tmpOut = null;
// Get the BluetoothSocket input and output streams
try {
try {
// This is a blocking call and will only return on a
// successful connection or an exception
mmSocket.connect();
System.out.println("$$$$$$$$$$$$$$$$****** socket connected ******$$$$$$$$$$$$$$$$");
} catch (IOException e) {
//connection to device failed so close the socket
try {
mmSocket.close();
System.out.println("$$$$$$$$$$$$$$$$****** socket closed ******$$$$$$$$$$$$$$$$");
} catch (IOException e2) {
System.out.println("$$$$$$$$$$$$$$$$****** in catch ******$$$$$$$$$$$$$$$$");
e2.printStackTrace();
}
}
tmpIn = mmSocket.getInputStream();
tmpOut = mmSocket.getOutputStream();
buffer = new byte[50];
} catch (IOException e) {
e.printStackTrace();
}
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
// Keep listening to the InputStream while connected
while (true) {
try {
//read the data from socket stream
if(mmInStream != null) {
mmInStream.read(buffer);
for(byte b : buffer)
{
char c = (char) b;
if(c >=' ' && c <'z') {
System.out.print(c);
output += c;
}
}
System.out.println();
Intent intent = new Intent("com.example.curie.fairbanks_01");
intent.putExtra("output",output);
LocalBroadcastManager.getInstance(InputActivity.getContext()).sendBroadcast(intent);
output = "";
}
// Send the obtained bytes to the UI Activity
} catch (IOException e) {
//an exception here marks connection loss
//send message to UI Activity
break;
}
}
}
public void write(byte[] buffer) {
try {
//write the data to socket stream
if(mmOutStream != null)
mmOutStream.write(buffer);
} catch (IOException e) {
e.printStackTrace();
}
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
此程序接收广播并抛出错误。
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.support.v4.content.LocalBroadcastManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class InputActivity extends AppCompatActivity {
TextView inputWindow;
Button readWeight;
BroadcastReceiver resultReceiver;
BluetoothDevice instrument;
BluetoothConnection connector;
String weight;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_input);
inputWindow = (TextView) findViewById(R.id.input_window);
readWeight = (Button) findViewById(R.id.read_weight);
instrument = DeviceList.instrument;
System.out.println("$$$$$$$$$$$$$$$$****** In new Activity ******$$$$$$$$$$$$$$$$");
connector = new BluetoothConnection(instrument);
inputWindow.setText(BluetoothConnection.output);
readWeight.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
connector.run();
//readWeight.setVisibility(View.INVISIBLE);
}
});
resultReceiver = createBroadcastReceiver();
LocalBroadcastManager.getInstance(this).registerReceiver(resultReceiver, new IntentFilter("com.intertech.random.generation"));
}
public static Context getContext()
{
return getContext();
}
private BroadcastReceiver createBroadcastReceiver() {
return new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
updateResults(intent.getStringExtra("result"));
}
};
}
public void updateResults(String update)
{
inputWindow.setText(update);
}
}
答案 0 :(得分：1)
广播接收器应这样设置...
private BroadcastReceiver createBroadcastReceiver() {
return new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
weight = intent.getStringExtra("Output");
runOnUiThread(new Runnable() {
@Override
public void run() {
//what you want to happen
}
});
}
};
}// end createBroadcastReceiver