如何使用Tablayout for Android？

Question

我想更新我的應用程序 的UI時，我與tablayout試試我的應用程序沒有工作，但是當我跟我以前的UI試試它的工作原理爲 選項卡布我創建一個tablayout活動& 3種不同的活動Weightscale， Bp和pulse oxi。所有活動都有單一服務。

Answer 1

做這樣

public class MainActivity extends TabActivity 
{ 

    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     contentReslolver = getContentResolver(); 
     context = getApplicationContext(); 

     // create the TabHost that will contain the Tabs 
     TabHost tabHost = (TabHost) findViewById(android.R.id.tabhost); 

     TabSpec deviceTab = tabHost.newTabSpec("First tab"); 

     TabSpec applicationTab = tabHost.newTabSpec("Second tab"); 
     // Set the Tab name and Activity 
     // that will be opened when particular Tab will be selected 


     deviceTab.setIndicator("First"); 
     deviceTab.setContent(new Intent(this, newclass2.class)); 

     applicationTab.setIndicator("second"); 
     applicationTab.setContent(new Intent(this, newclass.class)); 

     /** Add the tabs to the TabHost to display. */ 
     tabHost.addTab(homeScreenTab); 
     tabHost.addTab(PeripheralTab); 
     tabHost.addTab(deviceTab); 
     tabHost.addTab(applicationTab); 

    } 

，你R.layout.main將

<?xml version="1.0" encoding="utf-8"?> 

<TabHost xmlns:android="http://schemas.android.com/apk/res/android" 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent" 
      android:id="@android:id/tabhost"> 

     <LinearLayout 
       android:id="@+id/LinearLayout01" 
       android:orientation="vertical" 
       android:layout_height="fill_parent" 
       android:layout_width="fill_parent"> 
       <HorizontalScrollView 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:fillViewport="true" 
      android:scrollbars="none" > 
       <TabWidget 
        android:id="@android:id/tabs" 
        android:layout_height="wrap_content" 
        android:layout_width="fill_parent"> 
       </TabWidget> 
        </HorizontalScrollView> 
       <FrameLayout 
        android:id="@android:id/tabcontent" 
        android:layout_height="fill_parent" 
        android:layout_width="fill_parent"> 
       </FrameLayout> 

     </LinearLayout> 

</TabHost> 

Answer 2

//Tablayout.java 
public class AllDevicesActivity extends TabActivity { 
/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.all_devices); 

    TabHost tabHost = getTabHost(); 

    // Tab for Weighing Scale 
    TabSpec weighingspec = tabHost.newTabSpec("Weighing Scale"); 
    weighingspec.setIndicator("Weight", 
      getResources().getDrawable(R.drawable.weighing_icon)); 
    Intent weightIntent = new Intent(this, WeightScaleActivity.class); 
    weighingspec.setContent(weightIntent); 
    System.out.println("I am in weightScaleActivity "); 

    // Tab for BP Monitor 
    TabSpec bpspec = tabHost.newTabSpec("BP"); 
    // setting Title and Icon for the Tab 
    bpspec.setIndicator("BP", 
      getResources().getDrawable(R.drawable.bp_monitor_icon)); 
    Intent bpIntent = new Intent(this, BpActivity.class); 
    bpspec.setContent(bpIntent); 
    System.out.println("I am in BpActivity "); 

    // Tab for Pulse Oximeter 
    TabSpec pulsespec = tabHost.newTabSpec("Pulse"); 
    pulsespec.setIndicator("Pulse", 
      getResources().getDrawable(R.drawable.pulse_oxi_icon)); 
    Intent pulseIntent = new Intent(this, PulseOxiActivity.class); 
    pulsespec.setContent(pulseIntent); 
    System.out.println("I am in PulseOxiActivity "); 

    // Tab for All 
    TabSpec alldevicespec = tabHost.newTabSpec("All"); 
    alldevicespec.setIndicator("All", 
      getResources().getDrawable(R.drawable.pulse_oxi_icon)); 
    Intent allDeviceIntent = new Intent(this, DashboardActivity.class); 
    alldevicespec.setContent(allDeviceIntent); 
    System.out.println("I am in AllDevicesActivity "); 

    // Adding all TabSpec to TabHost 
    tabHost.addTab(weighingspec); // Adding Weighing scale tab 
    tabHost.addTab(bpspec); // Adding Bp monitor tab 
    tabHost.addTab(pulsespec); // Adding Pulse Oxi tab 
    tabHost.addTab(alldevicespec); // Adding All Devices tab 

} 

}

Answer 3

//tabLayout.xml 
<android.support.v4.app.FragmentTabHost 
xmlns:android="http://schemas.android.com/apk/res/android" 
android:id="@android:id/tabhost" 
android:layout_width="match_parent" 
android:layout_height="match_parent"> 

<LinearLayout 
    android:orientation="vertical" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <TabWidget 
     android:id="@android:id/tabs" 
     android:orientation="horizontal" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_weight="0"/> 

    <FrameLayout 
     android:id="@android:id/tabcontent" 
     android:layout_width="0dp" 
     android:layout_height="0dp" 
     android:layout_weight="0"/> 

    <FrameLayout 
     android:id="@+id/realtabcontent" 
     android:layout_width="match_parent" 
     android:layout_height="0dp" 
     android:layout_weight="1"/> 

</LinearLayout> 
</android.support.v4.app.FragmentTabHost>   

Answer 4

 //WeightscaleActivity 
    public class WeightScaleActivity extends Activity { 
    private static final String TAG = "BluetoothHealthActivity"; 
    // Use the appropriate IEEE 11073 data types based on the devices used. 
    // Below are some examples. Refer to relevant Bluetooth HDP specifications 
    // for detail. 
    // 0x1007 - blood pressure meter 
    // 0x1008 - body thermometer 
    // 0x100F - body weight scale 
    private static final int HEALTH_WEIGHTSCALE_PROFILE_SOURCE_DATA_TYPE = 0x100F; 

    private static final int REQUEST_ENABLE_BT = 1; 
    private BluetoothAdapter mBluetoothAdapter; 

    private BluetoothDevice[] mAllBondedDevices; 
    private BluetoothDevice mDevice; 
    private int mDeviceIndex = 0; 
    private Resources mRes; 
    private Messenger mHealthService; 
    private boolean mHealthServiceBound; 
    private double weight; 
    private JSONObject jsonObj; 
    public String weightStr; 
    public boolean wtConnected = false; 

    private ProgressDialog progressDialog; 
    private String healthDeviceMac; 

    // WeightScale 
    private TextView weight_scale_value; 
    private TextView weight_unit; 

    private Handler mIncomingHandler = new Handler() { 
     @Override 
     public void handleMessage(Message msg) { 
      switch (msg.what) { 
      // Application registration complete. 
      case BtHealthDeviceService.STATUS_HEALTH_APP_REG: 
       System.out.println("In hdpacrtivity handleMessage"); 
       break; 
      // Application unregistration complete. 
      case BtHealthDeviceService.STATUS_HEALTH_APP_UNREG: 
       break; 
      // Reading data from HDP device. 
      case BtHealthDeviceService.STATUS_READ_DATA: 
       showIndicator(getResources().getString(
         R.string.indicator_start_receive)); 

       break; 

      // Finish reading data from HDP device. 
      case BtHealthDeviceService.STATUS_READ_DATA_DONE: 

       if (weight_scale_value != null) { 
        weight_scale_value.setText("" + weight); 
       } 

       dismissIndicator(); 
       // Send Data on Cloud 
       sendData(); 
       break; 

      case BtHealthDeviceService.MSG_MAC_ADDRESS: 

       System.out.println("msg.obj.toString()" + msg.obj.toString()); 
       System.out.println("In mac address handle" + msg.arg1); 
       healthDeviceMac = msg.obj.toString(); 
       break; 
      // Channel creation complete. Some devices will automatically 
      // establish connection. 
      case BtHealthDeviceService.STATUS_CREATE_CHANNEL: 
       Log.d(TAG, "STATUS_CREATE_CHANNEl enabled"); 
       break; 
      // Channel destroy complete. This happens when either the device 
      // disconnects or there is extended inactivity. 
      case BtHealthDeviceService.STATUS_DESTROY_CHANNEL: 
       break; 
      case BtHealthDeviceService.RECEIVED_WEIGHT: 
       int weightt = msg.arg1; 
       Log.i(TAG, "msg.arg1 @ sys is " + weightt); 
       String weightStr = "" + weightt/100 + "." + weightt % 100; 
       weight = Double.parseDouble(weightStr); 
       System.out.println("Weight is:" + weight); 
       System.out.println("Weight:******"); 
       break; 

      default: 
       super.handleMessage(msg); 
      } 
     } 
    }; 
    private final Messenger mMessenger = new Messenger(mIncomingHandler); 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     // this code is for solving issue 
     // android.os.NetworkOnMainThreadException 
     if (android.os.Build.VERSION.SDK_INT > 9) { 
      StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder() 
        .permitAll().build(); 
      StrictMode.setThreadPolicy(policy); 
     } 

     // Check for Bluetooth availability on the Android platform. 
     mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); 
     if (mBluetoothAdapter == null) { 
      Toast.makeText(this, R.string.bluetooth_not_available, 
        Toast.LENGTH_LONG); 
      finish(); 
      return; 
     } 

     setContentView(R.layout.weightscale_toggle); 

     mRes = getResources(); 
     mHealthServiceBound = false; 

     // Weight Scale 
     // mWeight = (TextView) findViewById(R.id.Weight); 
     LinearLayout weightLayout = (LinearLayout) findViewById(R.id.value_layout_weight); 
     weight_scale_value = (TextView) weightLayout 
       .findViewById(R.id.disp_data_ws_value_textview); 
     weight_unit = (TextView) weightLayout 
       .findViewById(R.id.disp_data_ws_unit_textview); 

     Resources res = getBaseContext().getResources(); 
     weight_unit.setText("Kg"); 
     weight_unit.setText(res.getString(R.string.weightscale_unit)); 

     // Toggle button 
     final ToggleButton weight_scale_connect_app_button = (ToggleButton) findViewById(R.id.weightscale_register_app_button); 

     // Initiates application registration through {@link 
     // BluetoothHDPService}. 

     // Toggle Button Weightscale 
     weight_scale_connect_app_button 
       .setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { 
        @Override 
        public void onCheckedChanged(CompoundButton compoundButton, 
          boolean checked) { 
         if (checked) { 
          sendMessage(
            BtHealthDeviceService.MSG_REG_HEALTH_APP, 
            HEALTH_WEIGHTSCALE_PROFILE_SOURCE_DATA_TYPE); 
          System.out.println("in Weight Toggle*****"); 

         } else { 
          sendMessage(
            BtHealthDeviceService.MSG_UNREG_HEALTH_APP, 
            0); 
          System.out.println("in unregister Weight Toggle**"); 

         } 
        } 
       }); 

     if (weight_scale_connect_app_button.isChecked()) { 
      sendMessage(BtHealthDeviceService.MSG_REG_HEALTH_APP, 
        HEALTH_WEIGHTSCALE_PROFILE_SOURCE_DATA_TYPE); 
      System.out.println("in Weight Toggle**--"); 

     } else { 
      sendMessage(BtHealthDeviceService.MSG_UNREG_HEALTH_APP, 0); 
      System.out.println("in unregister Weight Toggle**--"); 

     } 

     // activity receiver not registered Exception 
     IntentFilter filter = new IntentFilter(); 
     registerReceiver(mReceiver, filter); 

    } 

    // Sets up communication with {@link BluetoothHDPService}. 
    private ServiceConnection mConnection = new ServiceConnection() { 
     public void onServiceConnected(ComponentName name, IBinder service) { 
      mHealthServiceBound = true; 
      System.out.println("In ServiceConnection onServiceConnected"); 
      Message msg = Message.obtain(null, 
        BtHealthDeviceService.MSG_REG_CLIENT); 
      msg.replyTo = mMessenger; 
      mHealthService = new Messenger(service); 
      if (mHealthService == null) { 
       System.out.println(">> mHealthService is null"); 
      } 
      try { 
       // 4 
       System.out.println("in ServiceConnection try..."); 
       mHealthService.send(msg); 
      } catch (RemoteException e) { 
       Log.w(TAG, "Unable to register client to service."); 
       e.printStackTrace(); 
      } 
     } 

     public void onServiceDisconnected(ComponentName name) { 
      System.out.println(" in onServiceDisconnected "); 
      mHealthService = null; 
      mHealthServiceBound = false; 
     } 
    }; 

    @Override 
    protected void onDestroy() { 
     super.onDestroy(); 
     if (mHealthServiceBound) 
      unbindService(mConnection); 
     unregisterReceiver(mReceiver); 
    } 

    @Override 
    protected void onStart() { 
     super.onStart(); 
     // If Bluetooth is not on, request that it be enabled. 
     if (!mBluetoothAdapter.isEnabled()) { 
      Intent enableIntent = new Intent(
        BluetoothAdapter.ACTION_REQUEST_ENABLE); 
      startActivityForResult(enableIntent, REQUEST_ENABLE_BT); 
     } else { 
      initialize(); 
     } 
    } 

    /** 
    * Ensures user has turned on Bluetooth on the Android device. 
    */ 
    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     switch (requestCode) { 
     case REQUEST_ENABLE_BT: 
      if (resultCode == Activity.RESULT_OK) { 
       initialize(); 
      } else { 
       finish(); 
       return; 
      } 
     } 
    } 

    /** 
    * Used by {@link SelectDeviceDialogFragment} to record the bonded Bluetooth 
    * device selected by the user. 
    * 
    * @param position 
    *   Position of the bonded Bluetooth device in the array. 
    */ 
    public void setDevice(int position) { 
     mDevice = this.mAllBondedDevices[position]; 
     mDeviceIndex = position; 
    } 

    private void connectChannel() { 
     sendMessageWithDevice(BtHealthDeviceService.MSG_CONNECT_CHANNEL); 
    } 

    private void disconnectChannel() { 
     sendMessageWithDevice(BtHealthDeviceService.MSG_DISCONNECT_CHANNEL); 
    } 

    private void initialize() { 
     // Starts health service. 
     Intent intent = new Intent(this, BtHealthDeviceService.class); 
     startService(intent); 
     bindService(intent, mConnection, Context.BIND_AUTO_CREATE); 
    } 

    // Intent filter and broadcast receive to handle Bluetooth on event. 
    private IntentFilter initIntentFilter() { 
     IntentFilter filter = new IntentFilter(); 
     filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED); 
     return filter; 
    } 

    private final BroadcastReceiver mReceiver = new BroadcastReceiver() { 
     @Override 
     public void onReceive(Context context, Intent intent) { 
      final String action = intent.getAction(); 
      if (BluetoothAdapter.ACTION_STATE_CHANGED.equals(action)) { 
       if (intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, 
         BluetoothAdapter.ERROR) == BluetoothAdapter.STATE_ON) { 
        initialize(); 
       } 

      } 
     } 
    }; 

    // Sends a message to {@link BluetoothHDPService}. 
    private void sendMessage(int what, int value) { 
     if (mHealthService == null) { 
      System.out 
        .println("In HDP activity sendMessage -Health Service not connected."); 

      Log.d(TAG, "Health Service not connected."); 
      return; 
     } 

     try { 
      System.out.println("hdp activity send message"); 
      System.out.println("what******" + what); 
      System.out.println("value*****" + value); 

      mHealthService.send(Message.obtain(null, what, value, 0)); 

     } catch (RemoteException e) { 
      Log.w(TAG, "Unable to reach service."); 

      e.printStackTrace(); 
     } 
    } 

    // Sends an update message, along with an HDP BluetoothDevice object, to 
    // {@link BluetoothHDPService}. The BluetoothDevice object is needed by the 
    // channel creation 
    // method. 
    private void sendMessageWithDevice(int what) { 
     if (mHealthService == null) { 
      Log.d(TAG, "Health Service not connected."); 
      System.out.println("in sendMessageWithDevice"); 
      return; 
     } 

     try { 
      System.out.println("in sendMessageWithDevice try"); 

      mHealthService.send(Message.obtain(null, what, mDevice)); 
     } catch (RemoteException e) { 
      Log.w(TAG, "Unable to reach service."); 
      e.printStackTrace(); 
     } 
    } 

    /** 
    * Dialog to display a list of bonded Bluetooth devices for user to select 
    * from. This is needed only for channel connection initiated from the 
    * application. 
    */ 
    public static class SelectDeviceDialogFragment extends DialogFragment { 

     public static SelectDeviceDialogFragment newInstance(String[] names, 
       int position) { 
      SelectDeviceDialogFragment frag = new SelectDeviceDialogFragment(); 
      Bundle args = new Bundle(); 
      args.putStringArray("names", names); 
      args.putInt("position", position); 
      frag.setArguments(args); 
      return frag; 
     } 

     @Override 
     public Dialog onCreateDialog(Bundle savedInstanceState) { 
      String[] deviceNames = getArguments().getStringArray("names"); 
      int position = getArguments().getInt("position", -1); 
      if (position == -1) 
       position = 0; 
      return new AlertDialog.Builder(getActivity()) 
        .setTitle(R.string.select_device) 
        .setPositiveButton(R.string.ok, 
          new DialogInterface.OnClickListener() { 
           public void onClick(DialogInterface dialog, 
             int which) { 
            ((WeightScaleActivity) getActivity()) 
              .connectChannel(); 
           } 
          }) 
        .setSingleChoiceItems(deviceNames, position, 
          new DialogInterface.OnClickListener() { 
           public void onClick(DialogInterface dialog, 
             int which) { 
            ((WeightScaleActivity) getActivity()) 
              .setDevice(which); 
           } 
          }).create(); 
     } 
    } 

    private void sendData() { 
     jsonObj = new JSONObject(); 

     new RestConnection().execute(); 
    } 

    private class RestConnection extends AsyncTask<Void, Void, String> { 

     private String TAG = this.getClass().getName(); 

     ProgressDialog progressDialog; 

     public RestConnection() { 
      super(); 
     } 

     @Override 
     protected void onPreExecute() { 
     } 

     @Override 
     protected String doInBackground(Void... arg0) { 
      String st = jsonObj.toString(); 
      String response = ""; 

      Log.i(TAG, st); 

      JSONObject item = null; 
      try { 
       item = new JSONObject(st); 
      } catch (JSONException e) { 
       Log.e(TAG, "Could not parse malformed JSON:" + st); 
      } 

      if (item == null) { 
       Log.e(TAG, "Null"); 
      } 

      // doing the respective post 
      try { 

       // POST DATA 
       String url = Constants.getDataPost(); 
       HttpClient httpClient = new DefaultHttpClient(); 
       HttpPost httpPost = new HttpPost(url); 
       HttpConnectionParams.setConnectionTimeout(
         httpClient.getParams(), 10000); 
       JSONObject json = new JSONObject(); 
       json.put("siteId", ""); 
       if (wtConnected == true) { 
        json.put("patientId", 5); 
        json.put("deviceMACId", healthDeviceMac); 
        json.put("readingType", 103); 
        json.put("deviceData", Double.toString(weight)); 
        json.put("deviceType", "WeightScale"); 

       } 
       json.put("assetId", ""); 

       json.put("geoLocationLatitude", ""); 

       json.put("clientId", ""); 

       json.put("timeStamp", System.currentTimeMillis()); 

       json.put("deviceRawData", ""); 
       json.put("geoLocationLongitude", ""); 

       System.out.println("Json Is:" + json); 
       StringEntity se = new StringEntity(json.toString()); 
       se.setContentType(new BasicHeader(HTTP.CONTENT_TYPE, 
         "application/json")); 
       httpPost.setEntity(se); 
       HttpResponse httpResponse = httpClient.execute(httpPost); 
       Log.i(TAG, "response " 
         + httpResponse.getStatusLine().getStatusCode()); 
       HttpEntity entityPost = httpResponse.getEntity(); 
       InputStream is = entityPost.getContent(); 
       String response1 = convertStreamToString(is); 
       Log.i(TAG, "response message " + response1); 

      } catch (Exception e) { 
       e.printStackTrace(); 
       Log.e(TAG, "Post error:Error"); 
       Log.i(TAG, "Weight" + response); 
      } 

      return response; 

     } 

     @Override 
     protected void onPostExecute(String result) { 
     } 
    } 

    private static String convertStreamToString(InputStream is) { 

     BufferedReader reader = new BufferedReader(new InputStreamReader(is)); 
     StringBuilder sb = new StringBuilder(); 

     String line = null; 
     try { 
      while ((line = reader.readLine()) != null) { 
       sb.append((line + "\n")); 
      } 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } finally { 
      try { 
       is.close(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 
     } 
     return sb.toString(); 
    } 

    // Progress Dialog for Data Reading 

    private Dialog progress; 

    private void showIndicator(String message) { 
     if (progress == null) { 
      progress = new Dialog(WeightScaleActivity.this); 
      // AlertDialog.Builder builder = new AlertDialog.Builder(context); 
      progress.getWindow().setBackgroundDrawable(new ColorDrawable(0)); 
      progress.requestWindowFeature(Window.FEATURE_NO_TITLE); 
      progress.setContentView(R.layout.custom_alert); 
      progress.setCancelable(false); 
     } 

     setIndicatorMessage(message); 

     if (!progress.isShowing()) { 
      progress.show(); 
     } 
    } 

    private void setIndicatorMessage(String message) { 
     if (progress == null) { 
      return; 
     } 
     TextView syncMessages = (TextView) progress 
       .findViewById(R.id.syncMessages1); 

     if (message == null) { 
      message = ""; 
     } 

     if (syncMessages != null) { 
      syncMessages.setText(message); 
     } 
    } 

    private void dismissIndicator() { 
     if (progress == null) { 
      return; 
     } 

     progress.dismiss(); 
     progress = null; 
    } 

    // Are you sure you want to exit? Alert Box 
    @Override 
    public void onBackPressed() { 
     AlertDialog.Builder builder = new AlertDialog.Builder(this); 
     builder.setMessage("Are you sure you want to exit?") 
       .setCancelable(false) 
       .setPositiveButton("Yes", 
         new DialogInterface.OnClickListener() { 
          public void onClick(DialogInterface dialog, int id) { 
           WeightScaleActivity.this.finish(); 
          } 
         }) 
       .setNegativeButton("No", new DialogInterface.OnClickListener() { 
        public void onClick(DialogInterface dialog, int id) { 
         dialog.cancel(); 
        } 
       }); 
     AlertDialog alert = builder.create(); 
     alert.show(); 

    } 

}