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Code Issues Releases Wiki Activity

Permanent implementation of the OG holder pattern

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This commit is contained in:
Bradlee Speice 2014-07-21 22:52:19 -04:00
parent 7c483695d3
commit 915467c465
3 changed files with 59 additions and 38 deletions
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50
app/src/main/java/org/bspeice/minimalbible/OGHolder.java Normal file
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@ -0,0 +1,50 @@
package org.bspeice.minimalbible;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import java.util.HashMap;
import java.util.Map;
import dagger.ObjectGraph;
/**
* Holding location for activity object graphs.
* This technique could be extended to other things, but honestly,
* everything it could be extended to likely needs to be in
* an ObjectGraph anyway.
* This works because getSupportFragmentManager() is scoped to each activity.
* TODO: Prove the above claim.
*/
public class OGHolder extends Fragment {
private final static String TAG = "OGHolder";
private ObjectGraph mObjectGraph;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
public void persistGraph(ObjectGraph graph) {
mObjectGraph = graph;
}
public ObjectGraph fetchGraph() {
return mObjectGraph;
}
public static OGHolder get(FragmentActivity activity) {
FragmentManager manager = activity.getSupportFragmentManager();
OGHolder holder = (OGHolder) manager.findFragmentByTag(TAG);
if (holder == null) {
holder = new OGHolder();
manager.beginTransaction().add(holder, TAG).commit();
}
return holder;
}
}

19
app/src/main/java/org/bspeice/minimalbible/activity/downloader/DownloadActivity.java
View File

@ -10,6 +10,7 @@ import android.view.MenuItem;
import org.bspeice.minimalbible.Injector;
import org.bspeice.minimalbible.MinimalBible;
import org.bspeice.minimalbible.OGHolder;
import org.bspeice.minimalbible.R;
import org.bspeice.minimalbible.activity.BaseActivity;
import org.bspeice.minimalbible.activity.BaseNavigationDrawerFragment;
@ -26,6 +27,8 @@ public class DownloadActivity extends BaseActivity implements
BaseNavigationDrawerFragment.NavigationDrawerCallbacks,
Injector {
private final String TAG = "DownloadActivity";
/**
* Fragment managing the behaviors, interactions and presentation of the
* navigation drawer.
@ -48,19 +51,15 @@ public class DownloadActivity extends BaseActivity implements
*/
private void buildObjGraph() {
if (daObjectGraph == null) {
FragmentManager fM = getSupportFragmentManager();
DownloadOGHolder ogHolder = (DownloadOGHolder) fM.findFragmentByTag("OG_HOLDER");
if (ogHolder == null) {
Log.e("DownloadActivity", "Creating new holder...");
ogHolder = new DownloadOGHolder();
OGHolder holder = OGHolder.get(this);
ObjectGraph holderGraph = holder.fetchGraph();
if (holderGraph == null) {
Log.i(TAG, "Rebuilding ObjectGraph...");
daObjectGraph = MinimalBible.get(this)
.plus(new DownloadActivityModules(this));
ogHolder.persistObjectGraph(daObjectGraph);
fM.beginTransaction().add(ogHolder, "OG_HOLDER").commit();
holder.persistGraph(daObjectGraph);
} else {
Log.e("DownloadActivity", "Found existing holder...");
daObjectGraph = ogHolder.fetchObjectGraph();
daObjectGraph.inject(this);
daObjectGraph = holderGraph;
}
}
daObjectGraph.inject(this);

28
app/src/main/java/org/bspeice/minimalbible/activity/downloader/DownloadOGHolder.java
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@ -1,28 +0,0 @@
package org.bspeice.minimalbible.activity.downloader;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import dagger.ObjectGraph;
/**
* Created by bspeice on 7/21/14.
*/
public class DownloadOGHolder extends Fragment {
ObjectGraph holder;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
public void persistObjectGraph(ObjectGraph holder) {
this.holder = holder;
}
public ObjectGraph fetchObjectGraph() {
return this.holder;
}
}