YouTubeAPIDemoActivity.java

/*
 * Copyright 2012 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.examples.youtubeapidemo;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.TextView;

import com.examples.youtubeapidemo.adapter.DemoArrayAdapter;
import com.examples.youtubeapidemo.adapter.DemoListViewItem;

import java.util.ArrayList;
import java.util.List;

/**
 * Main activity from which the user can select one of the other demo activities.
 */
public class YouTubeAPIDemoActivity extends Activity implements OnItemClickListener {

  private List<DemoListViewItem> activities;

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

    PackageInfo packageInfo = null;
    PackageManager pm = getPackageManager();
    try {
      packageInfo = pm.getPackageInfo(
          getPackageName(), PackageManager.GET_ACTIVITIES | PackageManager.GET_META_DATA);

    } catch (NameNotFoundException e) {
      Log.e(getString(R.string.loggingTag), "Could not find package with name " + getPackageName());
      finish();
    }

    int appMinVersion = packageInfo.applicationInfo.targetSdkVersion;

    activities = new ArrayList<DemoListViewItem>();
    for (ActivityInfo activityInfo : packageInfo.activities) {
      String name = activityInfo.name;
      Bundle metaData = activityInfo.metaData;

      if (metaData != null
          && metaData.getBoolean(getString(R.string.isLaunchableActivity), false)) {
        String label = getString(activityInfo.labelRes);
        int minVersion = metaData.getInt(getString(R.string.minVersion), appMinVersion);
        activities.add(new Demo(label, name, minVersion));
      }
    }

    ListView listView = (ListView) findViewById(R.id.demo_list);
    DemoArrayAdapter adapter = new DemoArrayAdapter(this, R.layout.list_item, activities);
    listView.setAdapter(adapter);
    listView.setOnItemClickListener(this);

    TextView disabledText = (TextView) findViewById(R.id.some_demos_disabled_text);
    disabledText.setText(getString(R.string.some_demos_disabled, android.os.Build.VERSION.SDK_INT));

    if (adapter.anyDisabled()) {
      disabledText.setVisibility(View.VISIBLE);
    } else {
      disabledText.setVisibility(View.GONE);
    }
  }

  @Override
  public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    Demo clickedDemo = (Demo) activities.get(position);

    Intent intent = new Intent();
    intent.setComponent(new ComponentName(getPackageName(), clickedDemo.className));
    startActivity(intent);
  }

  private final class Demo implements DemoListViewItem {

    public final String title;
    public final int minVersion;
    public final String className;

    public Demo(String title, String className, int minVersion) {
      this.className = className;
      this.title = title;
      this.minVersion = minVersion;
    }

    @Override
    public boolean isEnabled() {
      return android.os.Build.VERSION.SDK_INT >= minVersion;
    }

    @Override
    public String getDisabledText() {
      String itemDisabledText = getString(R.string.list_item_disabled);
      return String.format(itemDisabledText, minVersion);
    }

    @Override
    public String getTitle() {
      return title;
    }

  }

}