Android Open Source - MySms Main Activity

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License

The source code is released under:
Apache License
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Java Source Code

package com.henningta.mysms;
// w w w. j a v  a2  s  .c  o m
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.inputmethod.InputMethodManager;

public class MainActivity extends ActionBarActivity implements ConversationsFragment.OnSourceSelected {

  private FragmentManager fragmentManager;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // initialize toolbar
    Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    // init fragment manager
    fragmentManager = getFragmentManager();
    fragmentManager.addOnBackStackChangedListener(backStackChangedListener);

    if (savedInstanceState == null) {
      loadConversationsFragment();

      String source = getIntent().getStringExtra(Settings.KEY_SOURCE);
      if (source != null) {
        loadMessagesFragment(source);
      }
    }

    shouldDisplayHomeUp();
  }

  private void loadConversationsFragment() {
    String tag = ConversationsFragment.TAG;

    Fragment fragment = fragmentManager.findFragmentByTag(tag);
    if (fragment == null) {
      fragment = ConversationsFragment.newInstance();
    }

    // replace existing fragment
    fragmentManager.beginTransaction()
        .replace(R.id.content_frame, fragment, tag)
        .commit();
  }

  private void loadMessagesFragment(String source) {
    String tag = MessagesFragment.TAG + "." + source;

    Fragment fragment = fragmentManager.findFragmentByTag(tag);
    if (fragment == null) {
      fragment = MessagesFragment.newInstance(source);
    }

    // replace existing fragment
    fragmentManager.beginTransaction()
        .add(R.id.content_frame, fragment, tag)
        .addToBackStack(null)
        .commit();
  }

  @Override
  public void onSourceSelected(String source) {
    loadMessagesFragment(source);
  }

  @Override
  public void onBackPressed() {
    if (fragmentManager.getBackStackEntryCount() == 0) {
      super.onBackPressed();
    } else {
      fragmentManager.popBackStack();
    }
  }

  private FragmentManager.OnBackStackChangedListener backStackChangedListener =
      new FragmentManager.OnBackStackChangedListener() {
        @Override
        public void onBackStackChanged() {
          shouldDisplayHomeUp();

          // check that we're on the conversation fragment
          if (fragmentManager.getBackStackEntryCount() == 0) {
            // set toolbar
            getSupportActionBar().setTitle(R.string.app_name);
            getSupportActionBar().setSubtitle(null);

            // hide keyboard
            hideKeyboard();
          }
        }
      };

  @Override
  public boolean onSupportNavigateUp() {
    fragmentManager.popBackStack();
    return true;
  }

  private void shouldDisplayHomeUp() {
    //Enable Up button only  if there are entries in the back stack
    boolean hasBack = fragmentManager.getBackStackEntryCount() > 0;
    getSupportActionBar().setDisplayHomeAsUpEnabled(hasBack);
  }

  private void hideKeyboard() {
    InputMethodManager inputManager = (InputMethodManager)this.getSystemService(
        Context.INPUT_METHOD_SERVICE);

    // check if no view has focus:
    View v = this.getCurrentFocus();
    if (v == null) {
      return;
    }

    inputManager.hideSoftInputFromWindow(v.getWindowToken(), 0);
  }

}
Java Source Code List
