Android Open Source - droidling Refreshable Activity

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License

The source code is released under:

Copyright (c) 2012 Keith Trnka Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Softwa...

Java Source Code

package com.github.ktrnka.droidling;
/* w ww. j a va  2  s  . c o  m*/
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;
import android.widget.Toast;

import com.actionbarsherlock.app.SherlockActivity;
import com.actionbarsherlock.view.Menu;
import com.actionbarsherlock.view.MenuInflater;
import com.actionbarsherlock.view.MenuItem;

/**
 * Superclass for activities that want a menu bar, etc.
 * 
 * @author keith.trnka
 */
public abstract class RefreshableActivity extends SherlockActivity {
    private Menu optionsMenu;
    private Class<? extends Activity> helpActivityClass;
    private boolean initializeAsLoading = false;

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        optionsMenu = menu;

        MenuInflater inflater = getSupportMenuInflater();
        inflater.inflate(R.menu.refreshable, menu);

        if (initializeAsLoading) {
            setRefreshActionButtonState(true);
        }
        else if (hasNewData()) {
            final MenuItem refreshItem = optionsMenu.findItem(R.id.refreshMenu);
            refreshItem.setIcon(R.drawable.ic_action_refresh_blue);
        }

        return true;
    }

    protected void setInitiallyRefreshing(boolean initiallyRefreshing) {
        initializeAsLoading = initiallyRefreshing;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.refreshMenu:
                refresh(true);
                break;
            case R.id.helpMenu:
                if (helpActivityClass != null) {
                    Intent intent = new Intent(this, helpActivityClass);
                    startActivity(intent);
                }
                break;
        }

        return false;
    }

    public void setRefreshActionButtonState(final boolean refreshing) {
        if (optionsMenu != null) {
            final MenuItem refreshItem = optionsMenu.findItem(R.id.refreshMenu);
            if (refreshItem != null) {
                if (refreshing) {
                    runOnUiThread(new Runnable() {
                        public void run() {
                            refreshItem.setActionView(R.layout.actionbar_progress);
                        }
                    });
                }
                else {
                    runOnUiThread(new Runnable() {
                        public void run() {
                            refreshItem.setIcon(R.drawable.ic_action_refresh);
                            refreshItem.setActionView(null);
                        }
                    });
                }
            }
        }
        else {
            // If the optionsMenu is null, need to set the state for when it
            // starts up.
            setInitiallyRefreshing(refreshing);
        }
    }

    public void warning(final String message) {
        runOnUiThread(new Runnable() {
            public void run() {
                Toast.makeText(getApplicationContext(), message, Toast.LENGTH_SHORT).show();
            }
        });
    }

    public void error(final String message) {
        runOnUiThread(new Runnable() {
            public void run() {
                Toast.makeText(getApplicationContext(), message, Toast.LENGTH_LONG).show();
            }
        });
    }

    /**
     * Must be called in onCreate if you want it to work.
     * 
     * @param helpActivityClass
     */
    protected void setHelpActivity(Class<? extends Activity> helpActivityClass) {
        this.helpActivityClass = helpActivityClass;
    }

    protected void setPreference(String name, long longValue) {
        SharedPreferences prefs = PreferenceManager
                .getDefaultSharedPreferences(getApplicationContext());
        SharedPreferences.Editor editor = prefs.edit();
        editor.putLong(name, longValue);
        editor.commit();
    }

    protected void setPreference(String name, int intValue) {
        SharedPreferences prefs = PreferenceManager
                .getDefaultSharedPreferences(getApplicationContext());
        SharedPreferences.Editor editor = prefs.edit();
        editor.putInt(name, intValue);
        editor.commit();
    }

    /**
     * @return true if there's new data
     */
    protected abstract boolean hasNewData();

    /**
     * Refresh the data in the display
     * 
     * @param forceRefresh true if it should be built fresh, false if cached
     *            data is okay
     */
    protected abstract void refresh(boolean forceRefresh);
}

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