Java tutorial
package com.cforlando.streetartandroid; import android.content.Intent; import android.os.Bundle; import android.support.design.widget.CoordinatorLayout; import android.support.design.widget.NavigationView; import android.support.design.widget.Snackbar; import android.support.v4.view.GravityCompat; import android.support.v4.widget.DrawerLayout; import android.support.v4.widget.SwipeRefreshLayout; import android.support.v7.app.ActionBarDrawerToggle; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.GridLayoutManager; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.Toolbar; import android.view.Menu; import android.view.MenuItem; import android.view.View; import com.cforlando.streetartandroid.Helpers.ParseRecyclerQueryAdapter; import com.parse.ParseQuery; import com.parse.ParseQueryAdapter; import com.parse.ParseUser; import java.io.File; import java.util.List; import pl.aprilapps.easyphotopicker.DefaultCallback; import pl.aprilapps.easyphotopicker.EasyImage; public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener { private SwipeRefreshLayout mSwipeRefreshLayout; private RecyclerView mRecyclerView; private InstallationAdapter mInstallationAdapter; private CoordinatorLayout mCoordinatorLayout; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mCoordinatorLayout = (CoordinatorLayout) findViewById(R.id.content); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close); drawer.setDrawerListener(toggle); toggle.syncState(); NavigationView navigationView = (NavigationView) findViewById(R.id.navigation_view); navigationView.setNavigationItemSelectedListener(this); initRecyclerView(); initFab(); setRecyclerAdapter(mRecyclerView); } private void setRecyclerAdapter(RecyclerView recyclerView) { ParseQueryAdapter.QueryFactory factory = new ParseQueryAdapter.QueryFactory<com.cforlando.streetartandroid.Models.Installation>() { public ParseQuery<com.cforlando.streetartandroid.Models.Installation> create() { ParseQuery<com.cforlando.streetartandroid.Models.Installation> query = com.cforlando.streetartandroid.Models.Installation .getQuery(); query.include("creator"); query.whereExists("photos"); query.orderByDescending("createdAt"); return query; } }; mInstallationAdapter = new com.cforlando.streetartandroid.InstallationAdapter(factory, new com.cforlando.streetartandroid.InstallationAdapter.OnItemClickListener() { @Override public void onItemClick(com.cforlando.streetartandroid.Models.Installation installation) { Intent i = new Intent(getBaseContext(), InstallationDetailActivity.class); i.putExtra(InstallationDetailActivity.EXTRA_INSTALLATION, installation.getObjectId()); startActivity(i); } }, true); recyclerView.setAdapter(mInstallationAdapter); recyclerView.setLayoutManager(new GridLayoutManager(this, 2)); mInstallationAdapter.addOnQueryLoadListener( new ParseRecyclerQueryAdapter.OnQueryLoadListener<com.cforlando.streetartandroid.Models.Installation>() { @Override public void onLoaded(List<com.cforlando.streetartandroid.Models.Installation> objects, Exception e) { if (mSwipeRefreshLayout.isRefreshing()) { mSwipeRefreshLayout.setRefreshing(false); } } @Override public void onLoading() { if (!mSwipeRefreshLayout.isRefreshing()) { mSwipeRefreshLayout.setRefreshing(true); } } }); mSwipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipeRefreshLayout); mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { @Override public void onRefresh() { mInstallationAdapter.loadObjects(); } }); } private void initFab() { findViewById(R.id.fab).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if (ParseUser.getCurrentUser() == null) { loadSignIn(); } else { EasyImage.openChooserWithGallery(MainActivity.this, "Add a Photo", 0); } } }); } private void initRecyclerView() { mRecyclerView = (RecyclerView) findViewById(R.id.recycler); mRecyclerView.setLayoutManager(new GridLayoutManager(this, 2)); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); MenuItem menuItem = menu.findItem(R.id.action_logout); if (ParseUser.getCurrentUser() == null) { menuItem.setTitle(R.string.sign_in); } else { menuItem.setTitle(R.string.sign_out); } return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_licenses) { Intent intent = new Intent(this, LicenseActivity.class); startActivity(intent); } else if (id == R.id.action_logout) { if (ParseUser.getCurrentUser() == null) { loadSignIn(); } else { ParseUser.logOut(); Snackbar.make(mCoordinatorLayout, R.string.signed_out_message, Snackbar.LENGTH_SHORT).show(); item.setTitle(R.string.sign_in); } // Intent intent = new Intent(MainActivity.this, // LoginActivity.class); // intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK // | Intent.FLAG_ACTIVITY_NEW_TASK); // startActivity(intent); } return super.onOptionsItemSelected(item); } private void loadSignIn() { Intent i = new Intent(getBaseContext(), LoginActivity.class); startActivity(i); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); EasyImage.handleActivityResult(requestCode, resultCode, data, this, new DefaultCallback() { @Override public void onImagePickerError(Exception e, EasyImage.ImageSource source, int type) { //Some error handling } @Override public void onImagePicked(File imageFile, EasyImage.ImageSource source, int type) { //Handle the image Intent intent = new Intent(getApplicationContext(), NewInstallationActivity.class); intent.putExtra("image_file", imageFile); startActivity(intent); } @Override public void onCanceled(EasyImage.ImageSource source, int type) { //Cancel handling, you might wanna remove taken photo if it was canceled if (source == EasyImage.ImageSource.CAMERA) { File photoFile = EasyImage.lastlyTakenButCanceledPhoto(MainActivity.this); if (photoFile != null) photoFile.delete(); } } }); } @Override public boolean onNavigationItemSelected(MenuItem item) { // Handle navigation view item clicks here. int id = item.getItemId(); if (id == R.id.nav_camera) { // Handle the camera action } else if (id == R.id.nav_gallery) { } else if (id == R.id.nav_slideshow) { } else if (id == R.id.nav_manage) { } else if (id == R.id.nav_share) { } else if (id == R.id.nav_send) { } DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); drawer.closeDrawer(GravityCompat.START); return true; } }