Convert SDScanner MainActivity to fragment

res/layout/sdscanner_fragment.xml

@@ -0,0 +1,86 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+Copyright (C) 2013-2014 Jeremy Erickson
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+-->
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:paddingRight="16dp"
+    android:paddingLeft="16dp"
+    android:paddingBottom="16dp"
+    android:orientation="vertical" >
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="48dp"
+        android:gravity="center_vertical"
+        android:text="@string/path_label" />
+    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:tools="http://schemas.android.com/tools"
+        android:layout_width="match_parent"
+        android:layout_height="48dp"
+        android:orientation="horizontal" >
+        <EditText
+            android:id="@+id/path_widget"
+            android:layout_weight="1"
+            android:layout_width="0dp"
+            android:layout_height="match_parent" />
+        <ImageButton
+            android:id="@+id/path_button"
+            android:layout_width="48dp"
+            android:layout_height="wrap_content"
+            android:src="@android:drawable/ic_menu_revert"
+            style="?android:attr/borderlessButtonStyle" />
+    </LinearLayout>
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:paddingTop="4dp"
+        android:paddingBottom="4dp"
+        android:gravity="center_vertical"
+        android:text="@string/db_label" />
+    <CheckBox
+        android:id="@+id/restrict_checkbox"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/restrict_label" />
+    <Button
+        android:id="@+id/start_button"
+        android:layout_width="match_parent"
+        android:layout_height="64dp"
+        android:layout_gravity="center"
+        android:text="@string/button_start">
+        <requestFocus />
+    </Button>
+    <ProgressBar
+        style="?android:attr/progressBarStyleHorizontal"
+        android:max="100"
+        android:id="@+id/progress_bar"
+        android:layout_width="match_parent"
+        android:layout_height="48dp"
+        android:gravity="center_vertical"
+        android:progress="0" />
+    <TextView
+        android:id="@+id/progress_label"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_weight="10000"
+        android:text="@string/progress_unstarted_label" />
+    <TextView
+        android:id="@+id/debug_label"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:gravity="center_vertical"
+        android:text="" />
+</LinearLayout>
+

res/values/translatable.xml

@@ -312,4 +312,5 @@ THE SOFTWARE.
 	<string name="progress_unstarted_label">Not yet started.</string>
 	<string name="restrict_label">Ignore updated and deleted files outside of the specified path.</string>
 	<string name="skipping_folder_label">Encountered an error and skipping</string>
+	<string name="sdscanner">SD Scanner</string>
 </resources>

res/xml/preference_headers.xml

@@ -45,6 +45,9 @@ THE SOFTWARE.
 	<header
 		android:fragment="ch.blinkenlights.android.vanilla.PreferencesTheme"
 		android:title="@string/theme" />
+	<header
+		android:fragment="ch.blinkenlights.android.vanilla.SDScannerFragment"
+		android:title="@string/sdscanner" />
 	<header
 		android:fragment="ch.blinkenlights.android.vanilla.PreferencesActivity$AboutFragment"
 		android:title="@string/about" />

src/ch/blinkenlights/android/vanilla/SDScannerFragment.java

@@ -0,0 +1,196 @@
+/* SD Scanner - A manual implementation of the SD rescan process, compatible
+ * with Android 4.4
+ *
+ * Copyright (C) 2013-2014 Jeremy Erickson
+ * Copyright (C) 2016 Xiao Bao Clark
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+package ch.blinkenlights.android.vanilla;
+
+import android.app.Fragment;
+import android.app.FragmentManager;
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.os.Bundle;
+import android.os.Environment;
+import android.text.method.ScrollingMovementMethod;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.CheckBox;
+import android.widget.EditText;
+import android.widget.ProgressBar;
+import android.widget.TextView;
+
+import com.gmail.jerickson314.sdscanner.ScanFragment;
+import com.gmail.jerickson314.sdscanner.UIStringGenerator;
+
+import java.io.File;
+import java.io.IOException;
+
+/**
+ * Fragment version of the MainActivity from the SD Scanner app
+ */
+public class SDScannerFragment extends Fragment
+		implements ScanFragment.ScanProgressCallbacks
+{
+	ScanFragment mScanFragment;
+
+	@Override
+	public void updateProgressNum(int progressNum) {
+		ProgressBar progressBar = (ProgressBar)findViewById(R.id.progress_bar);
+		progressBar.setProgress(progressNum);
+	}
+
+	@Override
+	public void updateProgressText(UIStringGenerator progressText) {
+		TextView progressLabel = (TextView)findViewById(R.id.progress_label);
+		progressLabel.setText(progressText.toString(getActivity()));
+	}
+
+	@Override
+	public void updateDebugMessages(UIStringGenerator debugMessages) {
+		TextView debugLabel = (TextView)findViewById(R.id.debug_label);
+		debugLabel.setText(debugMessages.toString(getActivity()));
+	}
+
+	@Override
+	public void updatePath(String path) {
+		EditText pathText = (EditText) findViewById(R.id.path_widget);
+		pathText.setText(path);
+	}
+
+	@Override
+	public void updateStartButtonEnabled(boolean startButtonEnabled) {
+		Button startButton = (Button)findViewById(R.id.start_button);
+		startButton.setEnabled(startButtonEnabled);
+	}
+
+	public void updateRestrictCheckboxChecked(boolean checked) {
+		CheckBox restrictCheckbox = (CheckBox) findViewById(R.id.restrict_checkbox);
+		restrictCheckbox.setChecked(checked);
+	}
+
+	@Override
+	public void signalFinished() {
+
+	}
+
+	@Override
+	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+		return inflater.inflate(R.layout.sdscanner_fragment, container, false);
+	}
+
+	@Override
+	public void onViewCreated(View view, Bundle savedInstanceState) {
+		super.onViewCreated(view, savedInstanceState);
+		// Setup with values from fragment.
+		updateProgressNum(mScanFragment.getProgressNum());
+		updateProgressText(mScanFragment.getProgressText());
+		updateDebugMessages(mScanFragment.getDebugMessages());
+		updateStartButtonEnabled(mScanFragment.getStartButtonEnabled());
+
+		// Update path from preferences
+		SharedPreferences preferences = getActivity().getPreferences(Context.MODE_PRIVATE);
+		try {
+			updatePath(preferences.getString("path",
+					Environment.getExternalStorageDirectory().getCanonicalPath()));
+			updateRestrictCheckboxChecked(preferences.getBoolean(
+					"restrict_db_scan", false));
+		}
+		catch (IOException Ex) {
+			// Should never happen, but getCanonicalPath() declares the throw.
+			updatePath("");
+			updateRestrictCheckboxChecked(false);
+		}
+
+		// Make debug output scrollable.
+		TextView debugLabel = (TextView)findViewById(R.id.debug_label);
+		debugLabel.setMovementMethod(new ScrollingMovementMethod());
+
+		view.findViewById(R.id.path_button).setOnClickListener(new View.OnClickListener() {
+			@Override
+			public void onClick(View v) {
+				try {
+					defaultButtonPressed(v);
+				} catch (IOException e) {
+					throw new RuntimeException(e);
+				}
+			}
+		});
+
+		view.findViewById(R.id.start_button).setOnClickListener(new View.OnClickListener() {
+			@Override
+			public void onClick(View v) {
+				try {
+					startButtonPressed(v);
+				} catch (IOException e) {
+					throw new RuntimeException(e);
+				}
+			}
+		});
+	}
+
+	/** Called when the activity is first created. */
+	@Override
+	public void onCreate(Bundle savedInstanceState)
+	{
+		super.onCreate(savedInstanceState);
+
+		FragmentManager fm = getFragmentManager();
+		mScanFragment = (ScanFragment) fm.findFragmentByTag("scan");
+
+		if (mScanFragment == null) {
+			mScanFragment = new ScanFragment();
+			fm.beginTransaction().add(mScanFragment, "scan").commit();
+		}
+		mScanFragment.setScanProgressCallbacks(this);
+	}
+
+	private View findViewById(int viewId) {
+		return getView().findViewById(viewId);
+	}
+
+	@Override
+	public void onStop() {
+		super.onStop();
+
+		// Write setting to preferences
+		EditText pathText = (EditText) findViewById(R.id.path_widget);
+		CheckBox restrictCheckbox = (CheckBox) findViewById(R.id.restrict_checkbox);
+
+		SharedPreferences preferences = getActivity().getPreferences(Context.MODE_PRIVATE);
+		SharedPreferences.Editor editor = preferences.edit();
+		editor.putString("path", pathText.getText().toString());
+		editor.putBoolean("restrict_db_scan", restrictCheckbox.isChecked());
+		editor.commit();
+	}
+
+	public void defaultButtonPressed(View view) throws IOException {
+		updatePath(Environment.getExternalStorageDirectory().getCanonicalPath());
+	}
+
+	public void startButtonPressed(View view) throws IOException {
+		startScan();
+	}
+
+	public void startScan() throws IOException {
+		EditText pathText = (EditText) findViewById(R.id.path_widget);
+		File path = new File(pathText.getText().toString());
+		CheckBox restrictCheckbox = (CheckBox) findViewById(R.id.restrict_checkbox);
+
+		mScanFragment.startScan(path.getCanonicalFile(), restrictCheckbox.isChecked());
+	}
+
+}

src/com/gmail/jerickson314/sdscanner/ScanFragment.java

@@ -165,10 +165,16 @@ public class ScanFragment extends Fragment {
     @Override
     public void onAttach(Activity activity) {
         super.onAttach(activity);
-        mCallbacks = (ScanProgressCallbacks) activity;
+        if(activity instanceof ScanProgressCallbacks) {
+            mCallbacks = (ScanProgressCallbacks) activity;
+        }
         mApplicationContext = activity.getApplicationContext();
     }
 
+    public void setScanProgressCallbacks(ScanProgressCallbacks callbacks) {
+        mCallbacks = callbacks;
+    }
+
     public ScanFragment() {
         super();