eclipse 将 android 应用程序版本 2.3 更改为 4.2 android

Change android application version 2.3 to 4.2 android

提问by michael

My code is working in Android version is 2.3. What should I edit in the code so that it works in version 4.2 and above as well?

我的代码在 Android 版本是 2.3 中工作。我应该在代码中编辑什么才能使其在 4.2 及更高版本中也能正常工作？

My code,

我的代码，

    public class GPSTracker extends Service implements LocationListener {

    private final Context mContext;

    // flag for GPS status
    boolean isGPSEnabled = false;

    // flag for network status
    boolean isNetworkEnabled = false;

    // flag for GPS status
    boolean canGetLocation = false;

    Location location; // location
    double latitude; // latitude
    double longitude; // longitude

    // The minimum distance to change Updates in meters
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters

    // The minimum time between updates in milliseconds
    private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute

    // Declaring a Location Manager
    protected LocationManager locationManager;

    public GPSTracker(Context context) {
        this.mContext = context;
        getLocation();
    }

    public Location getLocation() {
        try {
            locationManager = (LocationManager) mContext
                    .getSystemService(LOCATION_SERVICE);

            // getting GPS status
            isGPSEnabled = locationManager
                    .isProviderEnabled(LocationManager.GPS_PROVIDER);

            // getting network status
            isNetworkEnabled = locationManager
                    .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

            if (!isGPSEnabled && !isNetworkEnabled) {
                // no network provider is enabled
            } else {
                this.canGetLocation = true;
                if (isNetworkEnabled) {
                    locationManager.requestLocationUpdates(
                            LocationManager.NETWORK_PROVIDER,
                            MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    Log.d("Network", "Network");
                    if (locationManager != null) {
                        location = locationManager
                                .getLastKnownLocation(LocationManager .NETWORK_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }
                    }
                }
                // if GPS Enabled get lat/long using GPS Services
                if (isGPSEnabled) {
                    if (location == null) {
                        locationManager.requestLocationUpdates(
                                LocationManager.GPS_PROVIDER,
                                MIN_TIME_BW_UPDATES,
                                MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                        Log.d("GPS Enabled", "GPS Enabled");
                        if (locationManager != null) {
                            location = locationManager
                                    .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (location != null) {
                                latitude = location.getLatitude();
                                longitude = location.getLongitude();
                            }
                        }
                    }
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        return location;
    }

    /**
     * Stop using GPS listener
     * Calling this function will stop using GPS in your app
     * */
    public void stopUsingGPS(){
        if(locationManager != null){
            locationManager.removeUpdates(GPSTracker.this);
        }       
    }

    /**
     * Function to get latitude
     * */
    public double getLatitude(){
        if(location != null){
            latitude = location.getLatitude();
        }

        // return latitude
        return latitude;
    }

    /**
     * Function to get longitude
     * */
    public double getLongitude(){
        if(location != null){
            longitude = location.getLongitude();
        }

        // return longitude
        return longitude;
    }

    /**
     * Function to check GPS/wifi enabled
     * @return boolean
     * */
    public boolean canGetLocation() {
        return this.canGetLocation;
    }

    /**
     * Function to show settings alert dialog
     * On pressing Settings button will lauch Settings Options
     * */
    public void showSettingsAlert(){
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

        // Setting Dialog Title
        alertDialog.setTitle("GPS is settings");

        // Setting Dialog Message
        alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");

        // On pressing Settings button
        alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog,int which) {
                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                mContext.startActivity(intent);
            }
        });

        // on pressing cancel button
        alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
            dialog.cancel();
            }
        });

        // Showing Alert Message
        alertDialog.show();
    }

    @Override
    public void onLocationChanged(Location location) {
    }

    @Override
    public void onProviderDisabled(String provider) {
    }

    @Override
    public void onProviderEnabled(String provider) {
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
    }

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }

    }

Manifest.xml

清单文件

<?xml version="1.0" encoding="utf-8"?>
        <manifest xmlns:android="http://schemas.android.com/apk/res/android"
            package="com.example.safetymobile"
            android:versionCode="2"
            android:versionName="1.2" >

            <uses-permission android:name="android.permission.READ_CONTACTS" />
            <uses-permission android:name="android.permission.READ_PHONE_STATE" />
            <uses-permission android:name="android.permission.INTERNET" />
            <uses-permission android:name="android.permission.CALL_PHONE" >
            </uses-permission>
            <uses-permission android:name="android.permission.CAMERA" />

            <uses-feature android:name="android.hardware.camera" />

            <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" >
            </uses-permission>
            <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" >
            </uses-permission>
            <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
            <uses-permission android:name="android.permission.BLUETOOTH" />
            <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
            <uses-permission android:name="android.permission.VIBRATE" >
            </uses-permission>
            <uses-permission android:name="android.permission.WAKE_LOCK" >
            </uses-permission>
            <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission>

            <uses-sdk
                android:minSdkVersion="8"
                android:targetSdkVersion="17" />

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

            <application
                android:allowBackup="true"
                android:icon="@drawable/ic_launcher"
                android:label="@string/app_name"
                android:theme="@style/AppTheme" >
                <activity
                    android:name="com.example.safetymobile.MainActivity"
                    android:label="@string/app_name" 
                    android:theme="@android:style/Theme.Light.NoTitleBar.Fullscreen"
                    android:clearTaskOnLaunch="true"
                    >
                    <intent-filter>
                        <action android:name="android.intent.action.MAIN" />

                        <category android:name="android.intent.category.LAUNCHER" />
                    </intent-filter>
                </activity>
                <activity
                    android:name="com.example.safetymobile.ContactList"
                    android:label="@string/title_activity_contact_list" >
                </activity>
                <activity
                    android:name="com.example.safetymobile.Change_setting"
                    android:label="@string/title_activity_change_setting"
                    android:clearTaskOnLaunch="true" >
                </activity>
                <activity
                    android:name="com.example.safetymobile.CallContent"
                    android:label="@string/title_activity_call_content"
                    android:theme="@android:style/Theme.Light.NoTitleBar.Fullscreen" >
                </activity>
                <activity
                    android:name="com.example.safetymobile.SMS"
                    android:label="@string/title_activity_sms"
                    android:theme="@android:style/Theme.Light.NoTitleBar.Fullscreen" >
                </activity>
                <activity
                    android:name="com.example.safetymobile.Alication_list"
                    android:label="@string/title_activity_alication_list"  >
                </activity>
                <activity
                    android:name="com.example.safetymobile.Apps"
                    android:label="@string/title_activity_apps" 
                    android:theme="@android:style/Theme.Light.NoTitleBar.Fullscreen">
                </activity>
                <activity
                    android:name="com.example.safetymobile.Pass"
                    android:label="@string/title_activity_pass" >
                </activity>
                <activity
                    android:name="com.example.safetymobile.ChangePass"
                    android:label="@string/title_activity_change_pass" >
                </activity>
                <activity
                    android:name="com.example.safetymobile.GPS"
                    android:label="@string/title_activity_gps" >
                </activity>
                <activity
                    android:name="com.example.safetymobile.LightActivity"
                    android:label="@string/title_activity_light"
                    android:theme="@android:style/Theme.Light.NoTitleBar.Fullscreen" >
                </activity>
                <receiver android:name=".StartupActivity">
                    <intent-filter>
                        <action android:name="android.intent.action.BOOT_COMPLETED"></action>
                        <category android:name="android.intent.category.DEFAULT"></category>
                    </intent-filter>
                </receiver>
            </application>

        </manifest>

LogCat :

日志猫：

10-30 09:37:31.816: E/AndroidRuntime(1260): FATAL EXCEPTION: main
10-30 09:37:31.816: E/AndroidRuntime(1260): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.safetymobile/com.example.safetymobile.MainActivity}: java.lang.NullPointerException
10-30 09:37:31.816: E/AndroidRuntime(1260):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
10-30 09:37:31.816: E/AndroidRuntime(1260):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
10-30 09:37:31.816: E/AndroidRuntime(1260):  at android.app.ActivityThread.access0(ActivityThread.java:141)
10-30 09:37:31.816: E/AndroidRuntime(1260):  at android.os.Handler.dispatchMessage(Handler.java:99)
10-30 09:37:31.816: E/AndroidRuntime(1260):  at android.app.ActivityThread.main(ActivityThread.java:5041)
10-30 09:37:31.816: E/AndroidRuntime(1260):  at java.lang.reflect.Method.invokeNative(Native Method)
10-30 09:37:31.816: E/AndroidRuntime(1260):  at java.lang.reflect.Method.invoke(Method.java:511)
10-30 09:37:31.816: E/AndroidRuntime(1260):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
10-30 09:37:31.816: E/AndroidRuntime(1260):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
10-30 09:37:31.816: E/AndroidRuntime(1260):  at dalvik.system.NativeStart.main(Native Method)
10-30 09:37:31.816: E/AndroidRuntime(1260): Caused by: java.lang.NullPointerException
10-30 09:37:31.816: E/AndroidRuntime(1260):  at com.example.safetymobile.MainActivity.onCreate(MainActivity.java:123)
10-30 09:37:31.816: E/AndroidRuntime(1260):  at android.app.Activity.performCreate(Activity.java:5104)
10-30 09:37:31.816: E/AndroidRuntime(1260):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
10-30 09:37:31.816: E/AndroidRuntime(1260):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)

How to change android application version 2.3 to 4.2?

如何将 android 应用程序版本 2.3 更改为 4.2？

i'm using eclipse ADT

我正在使用日食 ADT

onCreate part of MainActivity

主活动的 onCreate 部分

gps = new GPSTracker(MainActivity.this);
  // check if GPS enabled  
    if(gps.canGetLocation())
     {
     latitude = gps.getLatitude();
     longitude = gps.getLongitude();
     }
    else{
        // can't get location
        // GPS or Network is not enabled
        // Ask user to enable GPS/network in settings
        gps.showSettingsAlert();
     }
  ImageButton btn=(ImageButton)findViewById(R.id.application);
  btn.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View v) {
    Intent t = new Intent(v.getContext(),Apps.class);
    startActivity(call);
   }

  });
  mp2 = MediaPlayer.create(this,R.drawable.emsound);
  button = (Button) findViewById(R.id.buttonFlashlight);
  button1 = (Button) findViewById(R.id.panic);
  final Context context = this;
  @SuppressWarnings("unused")
  final SensorManager mSensorManager;
  final PowerManager mPowerManager;
  final WindowManager mWindowManager;
  final WakeLock mWakeLock;
    // Get an instance of the SensorManager
        mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);

        // Get an instance of the PowerManager
        mPowerManager = (PowerManager) getSystemService(POWER_SERVICE);

        // Get an instance of the WindowManager
        mWindowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
        mWindowManager.getDefaultDisplay();

        // Create a bright wake lock
        mWakeLock = mPowerManager.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK, getClass()
                .getName());
  PackageManager pm = context.getPackageManager();

  /*-----------check if camera is available----------*/

  if(!pm.hasSystemFeature(PackageManager.FEATURE_CAMERA))
  {
   @SuppressWarnings("unused")
   Logger message;
   Log.e("err", "Device has no camera!");
   Toast.makeText(getApplicationContext(),
   "Your device doesn't have camera!",Toast.LENGTH_SHORT).show();
   return;
  }

     camera = Camera.open();
     p = camera.getParameters();
  button.setOnClickListener(new OnClickListener() 
  {

   public void onClick(View v) 
      {
    if (isFlashOn) {
     Toast.makeText(getApplicationContext(), "torch is turned off!", Toast.LENGTH_SHORT).show();
     Log.i("info", "torch is turned off!"); 

     /*----------- if camera flash is available----------*/
     if(context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH))
     {
     p.setFlashMode(Parameters.FLASH_MODE_OFF);
     camera.setParameters(p);    

     //button.setsetText("Torch-ON");
     }

     /*----------- if camera flash is not available----------*/
     else
     {
      //Toast.makeText(getApplicationContext(), "flash is turned off!", Toast.LENGTH_SHORT).show();
        WindowManager.LayoutParams params = getWindow().getAttributes();
                    params.screenBrightness = -1;
                    getWindow().setAttributes(params);
      mWakeLock.release();
     }

     isFlashOn = false;
    } 
    else 
    {
     Toast.makeText(getApplicationContext(), "torch is turned on!", Toast.LENGTH_SHORT).show();
     Log.i("info", "torch is turned on!");

     /*----------- if camera flash is available----------*/
     if(context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH))
     {
     p.setFlashMode(Parameters.FLASH_MODE_TORCH);
     camera.setParameters(p);
     }

     /*----------- if camera flash is not available----------*/
     else
     {
      //Toast.makeText(getApplicationContext(), "flash is turned off!", Toast.LENGTH_SHORT).show();
     /* mWakeLock.acquire();
      WindowManager.LayoutParams params = getWindow().getAttributes();
                   params.screenBrightness = 1.0f;
                   getWindow().setAttributes(params);*/

                  DoToLight();
     }

     isFlashOn = true;
     //button.setText("Torch-OFF");
    }
      }
   });

回答by Hiren Patel

First of all do right click on project -> Property -> Android -> select 4.2 version (either android or google api) -> Apply -> ok.

首先右键单击project -> Property -> Android -> 选择 4.2 version (android or google api) -> Apply -> ok。

Happy Coding...

快乐编码...

回答by Harshid

Change Application Version:

更改应用程序版本：

right click on project -> Property -> Android -> select 4.2 version (as per your requirement) -> Apply -> ok.

Run

跑

right click on project ->Run As->Run Confi.->in android Application tab(left pannel),right pannel with android tab select your project->target Tab(check Launch on all compatible and select active device)

if getting any problem put comment.

如果遇到任何问题，请发表评论。