Android 开源框架 DataDroid
DataDroid是基于Android平台的一个开源的开发库,基于Android的RESTful封装用来简化Android应用中的数据管理.该开源库的下载地址为 CSDN资源.
DataDriod 在Android项目中的使用
从github上clone下来的源代码中就有很多种类型的数据管理的demo,这里就简单得描述一下通过DataDroid的工作流程进行一个打开摄像头的过程.想看下面项目的源码的可以去我的github查看,地址:Github
1.以单例模式建立一个请求管理器,这里需要注意的是在构造父类的时候,需要将一个RequestService传递给请求管理器,在调用RequestManager的execute方法时,会启动这个service.
public class CameraRequestManager extends RequestManager {
// Singleton management
private static CameraRequestManager sInstance;
public synchronized static CameraRequestManager from(Context context) {
if (sInstance == null) {
sInstance = new CameraRequestManager(context);
}
return sInstance;
}
private CameraRequestManager(Context context) {
super(context,CameraRequestService.class);
}
}
2.创建一个请求工厂,来创建各种不同的请求,这里就提供了一个返回打开摄像头的请求.
public final class CameraRequestFactory {
// Request types
public static final int REQUEST_TYPE_OPEN_CAMERA = 0;
// Response data
public static final String BUNDLE_EXTRA_SWITCH =
"cn.jesse.camera.datadroid.data.switch";
public static final String BUNDLE_EXTRA_OPEN_CAMERA =
"cn.jesse.camera.datadroid.data.opencamera";
public static final String BUNDLE_EXTRA_RESULT =
"com.foxykeep.datadroidpoc.extra.result";
public static final String BUNDLE_EXTRA_ERROR_MESSAGE =
"com.foxykeep.datadroidpoc.extra.errorMessage";
public static Request getOpeningCameraOperation(int type){
Request request = new Request(REQUEST_TYPE_OPEN_CAMERA);
request.setMemoryCacheEnabled(true);
request.put(OpenCameraOperation.PARAM_METHOD, type);
return request;
}
}
3.创建一个打开摄像头的operation,打开摄像头这个动作的所有操作都在这个operation中完成,并且完成之后可以通过bundle来将打开的结果回调给调用的activity.
public class OpenCameraOperation implements Operation {
private final String TAG = OpenCameraOperation.class.getSimpleName();
public static final String PARAM_METHOD = "cn.jesse.camera.extra.cameraType";
@Override
public Bundle execute(Context context, Request request)
throws ConnectionException, DataException, CustomRequestException {
Log.i(TAG, "execute");
int cameraType = request.getInt(PARAM_METHOD);
Log.i(TAG, "execute, camera type" + cameraType);
Bundle bundle = new Bundle();
bundle.putInt(CameraRequestFactory.BUNDLE_EXTRA_SWITCH, CameraRequestFactory.REQUEST_TYPE_OPEN_CAMERA);
bundle.putBoolean(CameraRequestFactory.BUNDLE_EXTRA_OPEN_CAMERA,true);
return bundle;
}
}
4.创建RequestService,根据不同的请求类型提供与之相对应的operation.
public class CameraRequestService extends RequestService {
@Override
public Operation getOperationForType(int requestType) {
switch (requestType) {
case CameraRequestFactory.REQUEST_TYPE_OPEN_CAMERA:
return new OpenCameraOperation();
}
return null;
}
@Override
protected Bundle onCustomRequestException(Request request, CustomRequestException exception) {
if (exception instanceof MyCustomRequestException) {
Bundle bundle = new Bundle();
bundle.putString(CameraRequestFactory.BUNDLE_EXTRA_ERROR_MESSAGE,
"MyCustomRequestException thrown.");
return bundle;
}
return super.onCustomRequestException(request, exception);
}
}
5.建立datadroid的activity,提供对datadroid 请求和请求队列的管理.
public abstract class DataDroidActivity extends FragmentActivity {
private static final String SAVED_STATE_REQUEST_LIST = "savedStateRequestList";
protected CameraRequestManager mRequestManager;
protected ArrayList<Request> mRequestList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mRequestManager = CameraRequestManager.from(this);
if (savedInstanceState != null) {
mRequestList = savedInstanceState.getParcelableArrayList(SAVED_STATE_REQUEST_LIST);
} else {
mRequestList = new ArrayList<Request>();
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putParcelableArrayList(SAVED_STATE_REQUEST_LIST, mRequestList);
}
protected void showBadDataErrorDialog() {
new ErrorDialogFragmentBuilder(this).setTitle(R.string.dialog_error_data_error_title)
.setMessage(R.string.dialog_error_data_error_message).show();
}
}
6.构建我们自己的activity继承自上面的DatadroidActivity, 在想要打开摄像头的时候,只需要从请求工厂中拿到openCamera的请求,用请求管理器来执行这个请求,并把该请求放入到请求队列中.....最后openCamera的结果就会通过onRequestFinished的回调来获取,整个过程还是比较简单的.
public class CameraActivity extends DataDroidActivity
implements ActionBar.OnNavigationListener, RequestListener,
ConnectionErrorDialogListener{
private String TAG = CameraActivity.class.getSimpleName();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera);
Log.i(TAG, "CameraActivity has been created");
Request openCameraRequest = CameraRequestFactory.getOpeningCameraOperation(Definition.CameraType.Default);
mRequestManager.execute(openCameraRequest, this);
mRequestList.add(openCameraRequest);
}
@Override
public void onRequestFinished(Request request, Bundle bundle) {
if (mRequestList.contains(request)) {
setProgressBarIndeterminateVisibility(false);
mRequestList.remove(request);
int choose = bundle.getInt(CameraRequestFactory.BUNDLE_EXTRA_SWITCH);
switch(choose){
case CameraRequestFactory.REQUEST_TYPE_OPEN_CAMERA:{
boolean openCameraStatus = false;
openCameraStatus = bundle.getBoolean(CameraRequestFactory.BUNDLE_EXTRA_OPEN_CAMERA);
if(openCameraStatus){
Log.i(TAG, "open camera succeed");
}else{
}
break;
}
}
}
}
}
原文地址：http://blog.csdn.net/menglele1314/article/details/46422205
