OSMonitor.java

package com.eolwral.osmonitor;

import java.util.HashMap;

import android.annotation.SuppressLint;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;

import com.eolwral.osmonitor.ipc.IpcService;
import com.eolwral.osmonitor.ui.ConnectionFragment;
import com.eolwral.osmonitor.ui.MessageFragment;
import com.eolwral.osmonitor.ui.MiscFragment;
import com.eolwral.osmonitor.ui.ProcessFragment;
import com.eolwral.osmonitor.util.CoreUtil;
import com.eolwral.osmonitor.util.UserInterfaceUtil;
import com.eolwral.osmonitor.settings.Settings;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.content.LocalBroadcastManager;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBar.Tab;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.view.Menu;

@SuppressWarnings("deprecation")
public class OSMonitor extends OSMonitorActivity implements
    ActionBar.TabListener, ViewPager.OnPageChangeListener {

  private ViewPager mViewPager = null;

  @Override
  public void onStop() {
    super.onStop();

    if (mViewPager == null)
      return;

    ((OSMonitorPagerAdapter) mViewPager.getAdapter()).getItem(
        mViewPager.getCurrentItem()).setUserVisibleHint(false);

    // end self
    if (isFinishing()) {
      IpcService.getInstance().disconnect();
      android.os.Process.killProcess(android.os.Process.myPid());
    }
  }

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    // create view
    super.onCreate(savedInstanceState);

    IpcService.Initialize(this);
    UserInterfaceUtil.Initialize(this);

    // load layout
    setContentView(R.layout.ui_main);

    // prepare pager
    mViewPager = (ViewPager) findViewById(R.id.mainpager);
    mViewPager
        .setAdapter(new OSMonitorPagerAdapter(getSupportFragmentManager()));
    mViewPager.setOnPageChangeListener(this);

    // keep all fragments
    mViewPager.setOffscreenPageLimit(5);

    // prepare action bar
    final ActionBar actionBar = getSupportActionBar();
    actionBar.setDisplayShowTitleEnabled(false);
    actionBar.setElevation(0);

    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    actionBar.addTab(actionBar.newTab().setText(R.string.ui_process_tab)
        .setTabListener(this));
    actionBar.addTab(actionBar.newTab().setText(R.string.ui_connection_tab)
        .setTabListener(this));
    actionBar.addTab(actionBar.newTab().setText(R.string.ui_misc_tab)
        .setTabListener(this));
    actionBar.addTab(actionBar.newTab().setText(R.string.ui_debug_tab)
        .setTabListener(this));

    mViewPager.setCurrentItem(0);

    // start background service
    final Settings setting = Settings.getInstance(this);
    if ((setting.isEnableCPUMeter() || setting.isAddShortCut())
        && !CoreUtil.isServiceRunning(this))
      startService(new Intent(this, OSMonitorService.class));

    // prepare exit
    LocalBroadcastManager.getInstance(this).registerReceiver(ExitReceiver,
        new IntentFilter("Exit"));
  }

  private BroadcastReceiver ExitReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
      IpcService.getInstance().forceExit();
      context.stopService(new Intent(context, OSMonitorService.class));
      finish();
    }
  };

  @Override
  protected void onDestroy() {
    LocalBroadcastManager.getInstance(this).unregisterReceiver(ExitReceiver);
    super.onDestroy();
  }

  @Override
  protected void onSaveInstanceState(Bundle outState) {
    // No call for super(). Bug on API Level > 11.
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    /* prepare option on action bar */
    super.onCreateOptionsMenu(menu);
    return true;
  }

  @Override
  public void onRestart() {
    super.onRestart();

    if (mViewPager == null)
      return;

    Fragment mFragment = ((OSMonitorPagerAdapter) mViewPager.getAdapter())
        .getItem(mViewPager.getCurrentItem());

    if (mFragment != null) {
      // catch exception when back from screen off
      try {
        mFragment.setUserVisibleHint(true);
      } catch (Exception e) { }
    }
  }

  @Override
  public void onTabSelected(Tab tab, FragmentTransaction ft) {
    mViewPager.setCurrentItem(tab.getPosition());
    if (mViewPager.getCurrentItem() != tab.getPosition())
      mViewPager.setCurrentItem(tab.getPosition());

    // force display menu when selected
    ((OSMonitorPagerAdapter) mViewPager.getAdapter()).getItem(
        mViewPager.getCurrentItem()).setMenuVisibility(true);
  }

  @Override
  public void onTabUnselected(Tab tab, FragmentTransaction ft) {
    // force to hidden when unselected
    ((OSMonitorPagerAdapter) mViewPager.getAdapter())
        .getItem(tab.getPosition()).setMenuVisibility(false);
  }

  @Override
  public void onTabReselected(Tab tab, FragmentTransaction ft) {
  }

  @Override
  public void onPageScrollStateChanged(int arg0) {
  }

  @Override
  public void onPageScrolled(int arg0, float arg1, int arg2) {
  }

  @Override
  public void onPageSelected(int arg0) {
    getSupportActionBar().setSelectedNavigationItem(arg0);
  }

  /* Pager Adapter for OSMonitor */
  public class OSMonitorPagerAdapter extends FragmentPagerAdapter {

    @SuppressLint("UseSparseArrays")
    HashMap<Integer, Fragment> mFragment = new HashMap<Integer, Fragment>();

    public OSMonitorPagerAdapter(FragmentManager fm) {
      super(fm);

    }

    @Override
    public Fragment getItem(int position) {

      if (mFragment.containsKey(position))
        return mFragment.get(position);

      switch (position) {
      /* Process */
      case 0:
        mFragment.put(0, new ProcessFragment());
        break;

      /* Connection */
      case 1:
        mFragment.put(1, new ConnectionFragment());
        break;

      /* Misc */
      case 2:
        mFragment.put(2, new MiscFragment());
        break;

      /* Message */
      case 3:
        mFragment.put(3, new MessageFragment());
        break;

      /* Monitor */
      case 4:
        // under construction
        break;
      }
      return mFragment.get(position);
    }

    @Override
    public int getCount() {
      return 4;
    }

  }

}