java - 在虚拟设备管理器中运行但在手机上强制关闭的代码

Question

package com.example.arduino;

import java.io.IOException;
import java.io.OutputStream;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.SeekBar;
import android.widget.TextView;

public class MainActivity extends Activity {

 private Button java;
 private SeekBar servo;
 byte srValue;


 private static final int REQUEST_ENABLE_BT = 1;

    ListView listDevicesFound;
    Button btnScanDevice;
    TextView stateBluetooth;
    BluetoothAdapter bluetoothAdapter;

    ArrayAdapter<String> btArrayAdapter;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btnScanDevice = (Button)findViewById(R.id.scandevice);

        stateBluetooth = (TextView)findViewById(R.id.bluetoothstate);
        bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();    
        listDevicesFound = (ListView)findViewById(R.id.devicesfound);
        btArrayAdapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_1);
        listDevicesFound.setAdapter(btArrayAdapter);

        servo = (SeekBar)findViewById(R.id.servocontroller);

        CheckBlueToothState();

        btnScanDevice.setOnClickListener(btnScanDeviceOnClickListener);

        registerReceiver(ActionFoundReceiver, 
          new IntentFilter(BluetoothDevice.ACTION_FOUND));


        servo.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener(){

          OutputStream Device;

            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                try{
                srValue = (byte)progress;
                }catch(Exception e)
                {
                    e.printStackTrace();
                }
            }

            public void onStopTrackingTouch(SeekBar seekBar) {
                String temp = "r";
                byte bytes[] = temp.getBytes();

                try {
                    Device.write(bytes);
                } catch (IOException e) {
                    e.printStackTrace();
                }

                try {
                    Device.write(srValue);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void onStartTrackingTouch(SeekBar arg0) {
                // TODO Auto-generated method stub

            }

        });
    }


    @Override
 protected void onDestroy() {
  // TODO Auto-generated method stub
  super.onDestroy();
  unregisterReceiver(ActionFoundReceiver);
 }

 private void CheckBlueToothState(){
     if (bluetoothAdapter == null){
         stateBluetooth.setText("Bluetooth NOT support");
        }else{
         if (bluetoothAdapter.isEnabled()){
          if(bluetoothAdapter.isDiscovering()){
           stateBluetooth.setText("Bluetooth is currently in device discovery process.");
          }else{
           stateBluetooth.setText("Bluetooth is Enabled.");
           btnScanDevice.setEnabled(true);
          }
         }else{
          stateBluetooth.setText("Bluetooth is NOT Enabled!");
          Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
             startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
         }
        }
    }

    private Button.OnClickListener btnScanDeviceOnClickListener
    = new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   btArrayAdapter.clear();
   bluetoothAdapter.startDiscovery();
  }};

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  // TODO Auto-generated method stub
  if(requestCode == REQUEST_ENABLE_BT){
   CheckBlueToothState();
  }
 }

 private final BroadcastReceiver ActionFoundReceiver = new BroadcastReceiver(){

  @Override
  public void onReceive(Context context, Intent intent) {
   // TODO Auto-generated method stub
   String action = intent.getAction();
   if(BluetoothDevice.ACTION_FOUND.equals(action)) {
             BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
             btArrayAdapter.add(device.getName() + "\n" + device.getAddress());
             btArrayAdapter.notifyDataSetChanged();
         }
  }};


}

好吧，这段代码在虚拟设备管理器中编译，但是当我将它导入到我的手机时，它立即崩溃，我已经被困了几个小时。怎么可以在eclipse上编译，但在手机上不行呢？我尝试了许多较低级别的 Android 操作系统，但每次仍然强制关闭

    07-23 21:53:40.204  6517  6517 E AndroidRuntime: FATAL EXCEPTION: main

07-23 21:53:40.204  6517  6517 E AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.arduino/com.example.arduino.MainActivity}: java.lang.SecurityException: Permission Denial: starting Intent { act=android.bluetooth.adapter.action.REQUEST_ENABLE cmp=com.android.settings/.bluetooth.RequestPermissionActivity } from ProcessRecord{41864c40 6517:com.example.arduino/u0a10153} (pid=6517, uid=10153) requires android.permission.BLUETOOTH

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2306)

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2356)

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    at android.app.ActivityThread.access$600(ActivityThread.java:150)

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1244)

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    at android.os.Handler.dispatchMessage(Handler.java:99)

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    at android.os.Looper.loop(Looper.java:137)

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    at android.app.ActivityThread.main(ActivityThread.java:5195)

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    at java.lang.reflect.Method.invokeNative(Native Method)

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    at java.lang.reflect.Method.invoke(Method.java:511)

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    at dalvik.system.NativeStart.main(Native Method)

07-23 21:53:40.204  6517  6517 E AndroidRuntime: Caused by: java.lang.SecurityException: Permission Denial: starting Intent { act=android.bluetooth.adapter.action.REQUEST_ENABLE cmp=com.android.settings/.bluetooth.RequestPermissionActivity } from ProcessRecord{41864c40 6517:com.example.arduino/u0a10153} (pid=6517, uid=10153) requires android.permission.BLUETOOTH

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    at android.os.Parcel.readException(Parcel.java:1425)

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    at android.os.Parcel.readException(Parcel.java:1379)

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:1893)

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    at android.app.Instrumentation.execStartActivity(Instrumentation.java:1412)

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    at android.app.Activity.startActivityForResult(Activity.java:3370)

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    at android.app.Activity.startActivityForResult(Activity.java:3331)

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    at com.example.arduino.MainActivity.CheckBlueToothState(MainActivity.java:121)

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    at com.example.arduino.MainActivity.onCreate(MainActivity.java:52)

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    at android.app.Activity.performCreate(Activity.java:5104)

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2260)

07-23 21:53:40.204  6517  6517 E AndroidRuntime:    ... 11 more

07-23 21:53:40.214   661 12263 W ActivityManager:   Force finishing activity com.example.arduino/.MainActivity

07-23 21:53:40.324   661 12263 D dalvikvm: GC_FOR_ALLOC freed 1794K, 27% free 24899K/33868K, paused 77ms, total 78ms

07-23 21:53:40.824   661   676 W ActivityManager: Activity pause timeout for ActivityRecord{416c36f0 u0 com.example.arduino/.MainActivity}

07-23 21:53:40.965   661   661 I ActivityManager: No longer want com.android.musicfx (pid 6218): empty #17

07-23 21:53:41.505  6517  6517 I Process : Sending signal. PID: 6517 SIG: 9

07-23 21:53:41.505   661  1293 I ActivityManager: Process com.example.arduino (pid 6517) has died.

07-23 21:53:41.525   661 22882 W InputMethodManagerService: Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@41c3e618 attribute=null, token = android.os.BinderProxy@41c84818

07-23 21:53:42.086   873 12278 D dalvikvm: GC_FOR_ALLOC freed 6812K, 38% free 27836K/44836K, paused 60ms, total 60ms

07-23 21:53:42.146   873 12278 D dalvikvm: GC_FOR_ALLOC freed 38K, 36% free 29069K/44836K, paused 34ms, total 34ms

07-23 21:53:42.146   873 12278 I dalvikvm-heap: Grow heap (frag case) to 29.565MB for 1048592-byte allocation

07-23 21:53:42.206   873   885 D dalvikvm: GC_FOR_ALLOC freed 0K, 35% free 30093K/45864K, paused 53ms, total 53ms

07-23 21:53:42.236   873 12278 D dalvikvm: GC_FOR_ALLOC freed 1K, 35% free 30093K/45864K, paused 35ms, total 35ms

07-23 21:53:42.246   873 12278 I dalvikvm-heap: Grow heap (frag case) to 31.344MB for 1865972-byte allocation

07-23 21:53:42.286   873   885 D dalvikvm: GC_FOR_ALLOC freed <1K, 34% free 31914K/47688K, paused 38ms, total 38ms

Answer 1

请记住在您的应用 list 文件中声明蓝牙权限:

<manifest ... >
  <uses-permission android:name="android.permission.BLUETOOTH" />
  ...
</manifest>