android 程序打开第三方程序

因为在开发过程中需要开启扫描第三方程序，并且点击启动的效果，所以对这个功能进行了实现，并且分享出来个大家。

之前看到网上说需要获取包名和类名，然后通过  intent 才能打开这个程序，其实不必要这样。

在android API中，有这么一个接口，

Intent android.content.pm. PackageManager.getLaunchIntentForPackage( String packageName)

实际说的就是传入包名即可返回Intent，继而startActivity 即可打开第三方程序了。

以下是Demo：

界面 GetApplicationActivity.

public class GetApplicationActivity extends Activity implements
		OnItemClickListener {

	private GetApplicationAdpater mGetApplicationAdpater;
	private ArrayList<ApplicationData> applicationDatas;
	private ArrayList<ApplicationData> tempApplicationDatas;
	private ListView mListView;
	private PackageManager mPackageManager;
	private static final int Refresh_List_View = 0x001;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		mListView = (ListView) findViewById(R.id.application_list);
		initData();
	}
	private void initData() {
		applicationDatas = new ArrayList<ApplicationData>();
		tempApplicationDatas = new ArrayList<ApplicationData>();
		mGetApplicationAdpater = new GetApplicationAdpater(this,
				applicationDatas);
		mListView.setAdapter(mGetApplicationAdpater);
		mListView.setOnItemClickListener(this);
		getData();
		mPackageManager = getPackageManager();
	}

	private void getData() {
		GetApplicationAsyncTask mGetApplicationAsyncTask = new GetApplicationAsyncTask();
		mGetApplicationAsyncTask.getApplicationList(this,
				new GetApplicationList() {
					@Override
					public void dataCallback(
							ArrayList<ApplicationData> applicationDatas) {
						if (applicationDatas != null) {
							tempApplicationDatas = applicationDatas;
						}
						mHandler.sendEmptyMessage(Refresh_List_View);
					}

				});
	}

	private Handler mHandler = new Handler() {
		public void handleMessage(Message msg) {
			switch (msg.what) {
			case Refresh_List_View:
				int count = tempApplicationDatas.size();
				applicationDatas.clear();
				for (int i = 0; i < count; i++) {
					applicationDatas.add(tempApplicationDatas.get(i));
				}
				mGetApplicationAdpater.notifyDataSetChanged();
				break;

			default:
				break;
			}
		};
	};

	@Override
	public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
		// TODO Auto-generated method stub
		String packageName = applicationDatas.get(position).getPackageName();
		Intent i = mPackageManager.getLaunchIntentForPackage(packageName);
		if (i != null)
			startActivity(i);
	}
}

java

适配器 GetApplicationAdpater.java

public class GetApplicationAdpater extends BaseAdapter{
	
	private ArrayList<ApplicationData> applicationDatas;
	private LayoutInflater mLayoutInflater;
	
	public GetApplicationAdpater(Context context,ArrayList<ApplicationData> applicationDatas) {
		super();
		this.applicationDatas = applicationDatas;
		mLayoutInflater = LayoutInflater.from(context);
	}

	@Override
	public int getCount() {
		// TODO Auto-generated method stub
		return applicationDatas.size();
	}

	@Override
	public Object getItem(int position) {
		// TODO Auto-generated method stub
		return applicationDatas.get(position);
	}

	@Override
	public long getItemId(int position) {
		// TODO Auto-generated method stub
		return position;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		ViewHolder mViewHolder;
		ApplicationData mApplicationData = applicationDatas
				.get(position);

		if (convertView == null) {
			mViewHolder = new ViewHolder();
			convertView = mLayoutInflater
					.inflate(R.layout.list_item_view, null);
			mViewHolder.image = (ImageView) convertView
					.findViewById(R.id.image);
			mViewHolder.title = (TextView) convertView.findViewById(R.id.title);
			convertView.setTag(mViewHolder);
		} else {
			mViewHolder = (ViewHolder) convertView.getTag();
		}
		mViewHolder.image.setImageDrawable(mApplicationData.getiCon());
		mViewHolder.title.setText(mApplicationData.getAppName());
		return convertView;
	}

	public final class ViewHolder {
		public ImageView image;
		public TextView title;
	}

}

获取程序包名类 GetApplicationAsyncTask.java 

public class GetApplicationAsyncTask extends
		AsyncTask<Integer, Integer, String> {
	private GetApplicationList mGetApplicationList;
	private ArrayList<ApplicationData> applicationDatas;
	private Context mContext;

	@Override
	protected String doInBackground(Integer... params) {
		PackageManager mPackageManager = mContext.getPackageManager();
		List<PackageInfo> packageInfos = mPackageManager
				.getInstalledPackages(PackageManager.GET_UNINSTALLED_PACKAGES);  获取程序列表
		applicationDatas = new ArrayList<ApplicationData>();
		for (PackageInfo packs : packageInfos) {
			if((packs.applicationInfo.flags&ApplicationInfo.FLAG_SYSTEM)==0)  //主要过滤系统的程序
			{
				ApplicationData mApplicationData= new ApplicationData();
				mApplicationData.setiCon(packs.applicationInfo.loadIcon(mPackageManager));
				mApplicationData.setAppName(packs.applicationInfo.loadLabel(mPackageManager).toString());
				mApplicationData.setPackageName(packs.packageName);
				applicationDatas.add(mApplicationData);
			}
		}
		return null;
	}

	@Override
	protected void onPostExecute(String result) {
		// TODO Auto-generated method stub
		mGetApplicationList.dataCallback(applicationDatas);
	}

	public void getApplicationList(Context context,
			GetApplicationList getApplicationList) {
		this.mGetApplicationList = getApplicationList;
		this.mContext = context;
		this.execute();
	}

	public interface GetApplicationList {
		public void dataCallback(ArrayList<ApplicationData> applicationDatas);
	}
}

代码比较简单，我就不做解释了。