add a widget configuration screen

app/build.gradle

@@ -23,4 +23,6 @@ dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
     testCompile 'junit:junit:4.12'
     compile 'com.android.support:appcompat-v7:23.1.1'
+    compile 'com.jakewharton:butterknife:7.0.1'
+    compile 'com.github.yukuku:ambilwarna:2.0.1'
 }

app/src/main/AndroidManifest.xml

@@ -19,6 +19,15 @@
             </intent-filter>
         </activity>
 
+        <activity
+            android:name=".MyWidgetConfigure"
+            android:screenOrientation="portrait"
+            android:theme="@style/MyWidgetConfigTheme">
+            <intent-filter>
+                <action android:name="android.appwidget.action.APPWIDGET_CONFIGURE"/>
+            </intent-filter>
+        </activity>
+
         <receiver
             android:name=".MyWidgetProvider"
             android:icon="@mipmap/ic_launcher"

app/src/main/java/notes/simplemobiletools/com/Constants.java

@@ -3,4 +3,6 @@ package notes.simplemobiletools.com;
 public class Constants {
     public static final String PREFS = "prefs";
     public static final String TEXT = "text";
+    public static final String WIDGET_BG_COLOR = "widget_bg_color";
+    public static final String WIDGET_TEXT_COLOR = "widget_text_color";
 }

app/src/main/java/notes/simplemobiletools/com/MainActivity.java

@@ -14,18 +14,21 @@ import android.view.inputmethod.InputMethodManager;
 import android.widget.EditText;
 import android.widget.Toast;
 
+import butterknife.Bind;
+import butterknife.ButterKnife;
+
 public class MainActivity extends AppCompatActivity {
     private SharedPreferences prefs;
-    private EditText notesView;
+    @Bind(R.id.notes_view) EditText notesView;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+        ButterKnife.bind(this);
 
         prefs = getSharedPreferences(Constants.PREFS, Context.MODE_PRIVATE);
         final String text = prefs.getString(Constants.TEXT, "");
-        notesView = (EditText) findViewById(R.id.notesView);
         notesView.setText(text);
     }
 

app/src/main/java/notes/simplemobiletools/com/MyWidgetConfigure.java

@@ -0,0 +1,170 @@
+package notes.simplemobiletools.com;
+
+import android.appwidget.AppWidgetManager;
+import android.content.Context;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.graphics.Color;
+import android.os.Bundle;
+import android.support.v7.app.AppCompatActivity;
+import android.view.View;
+import android.widget.Button;
+import android.widget.RemoteViews;
+import android.widget.SeekBar;
+import android.widget.TextView;
+
+import butterknife.Bind;
+import butterknife.ButterKnife;
+import butterknife.OnClick;
+import yuku.ambilwarna.AmbilWarnaDialog;
+
+public class MyWidgetConfigure extends AppCompatActivity {
+    @Bind(R.id.config_bg_color) View bgColorPicker;
+    @Bind(R.id.config_bg_seekbar) SeekBar bgSeekBar;
+    @Bind(R.id.config_text_color) View textColorPicker;
+    @Bind(R.id.notes_view) TextView notesView;
+    @Bind(R.id.config_save) Button saveBtn;
+
+    private int widgetId;
+    private int bgColor;
+    private int bgColorWithoutTransparency;
+    private float bgAlpha;
+    private int textColor;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setResult(RESULT_CANCELED);
+        setContentView(R.layout.widget_config);
+        ButterKnife.bind(this);
+        initVariables();
+
+        final Intent intent = getIntent();
+        final Bundle extras = intent.getExtras();
+        if (extras != null)
+            widgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID);
+
+        if (widgetId == AppWidgetManager.INVALID_APPWIDGET_ID)
+            finish();
+    }
+
+    private void initVariables() {
+        final SharedPreferences prefs = getSharedPreferences(Constants.PREFS, Context.MODE_PRIVATE);
+        bgColor = prefs.getInt(Constants.WIDGET_BG_COLOR, 0);
+        if (bgColor == 0) {
+            bgColor = Color.BLACK;
+            bgAlpha = .5f;
+        } else {
+            bgAlpha = Color.alpha(bgColor) / (float) 255;
+        }
+
+        bgColorWithoutTransparency = Color.rgb(Color.red(bgColor), Color.green(bgColor), Color.blue(bgColor));
+        bgSeekBar.setOnSeekBarChangeListener(bgSeekbarChangeListener);
+        bgSeekBar.setProgress((int) (bgAlpha * 100));
+        updateBackgroundColor();
+
+        textColor = prefs.getInt(Constants.WIDGET_TEXT_COLOR, Color.WHITE);
+        updateTextColor();
+    }
+
+    @OnClick(R.id.config_save)
+    public void saveConfig() {
+        final AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(this);
+        final RemoteViews views = new RemoteViews(getPackageName(), R.layout.activity_main);
+        views.setInt(R.id.notes_view, "setBackgroundColor", bgColor);
+        appWidgetManager.updateAppWidget(widgetId, views);
+
+        storeWidgetBackground();
+        requestWidgetUpdate();
+
+        final Intent resultValue = new Intent();
+        resultValue.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, widgetId);
+        setResult(RESULT_OK, resultValue);
+        finish();
+    }
+
+    private void storeWidgetBackground() {
+        final SharedPreferences prefs = getSharedPreferences(Constants.PREFS, Context.MODE_PRIVATE);
+        prefs.edit().putInt(Constants.WIDGET_BG_COLOR, bgColor).apply();
+        prefs.edit().putInt(Constants.WIDGET_TEXT_COLOR, textColor).apply();
+    }
+
+    private void requestWidgetUpdate() {
+        final Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_UPDATE, null, this, MyWidgetProvider.class);
+        intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, new int[]{widgetId});
+        sendBroadcast(intent);
+    }
+
+    private void updateBackgroundColor() {
+        bgColor = adjustAlpha(bgColorWithoutTransparency, bgAlpha);
+        notesView.setBackgroundColor(bgColor);
+        bgColorPicker.setBackgroundColor(bgColor);
+        saveBtn.setBackgroundColor(bgColor);
+    }
+
+    private void updateTextColor() {
+        textColorPicker.setBackgroundColor(textColor);
+        saveBtn.setTextColor(textColor);
+        notesView.setTextColor(textColor);
+    }
+
+    @OnClick(R.id.config_bg_color)
+    public void pickBackgroundColor() {
+        AmbilWarnaDialog dialog = new AmbilWarnaDialog(this, bgColorWithoutTransparency, new AmbilWarnaDialog.OnAmbilWarnaListener() {
+            @Override
+            public void onCancel(AmbilWarnaDialog dialog) {
+            }
+
+            @Override
+            public void onOk(AmbilWarnaDialog dialog, int color) {
+                bgColorWithoutTransparency = color;
+                updateBackgroundColor();
+            }
+        });
+
+        dialog.show();
+    }
+
+    @OnClick(R.id.config_text_color)
+    public void pickTextColor() {
+        AmbilWarnaDialog dialog = new AmbilWarnaDialog(this, textColor, new AmbilWarnaDialog.OnAmbilWarnaListener() {
+            @Override
+            public void onCancel(AmbilWarnaDialog dialog) {
+            }
+
+            @Override
+            public void onOk(AmbilWarnaDialog dialog, int color) {
+                textColor = color;
+                updateTextColor();
+            }
+        });
+
+        dialog.show();
+    }
+
+    private SeekBar.OnSeekBarChangeListener bgSeekbarChangeListener = new SeekBar.OnSeekBarChangeListener() {
+        @Override
+        public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
+            bgAlpha = (float) progress / (float) 100;
+            updateBackgroundColor();
+        }
+
+        @Override
+        public void onStartTrackingTouch(SeekBar seekBar) {
+
+        }
+
+        @Override
+        public void onStopTrackingTouch(SeekBar seekBar) {
+
+        }
+    };
+
+    private int adjustAlpha(int color, float factor) {
+        final int alpha = Math.round(Color.alpha(color) * factor);
+        final int red = Color.red(color);
+        final int green = Color.green(color);
+        final int blue = Color.blue(color);
+        return Color.argb(alpha, red, green, blue);
+    }
+}

app/src/main/java/notes/simplemobiletools/com/MyWidgetProvider.java

@@ -4,6 +4,7 @@ import android.appwidget.AppWidgetManager;
 import android.appwidget.AppWidgetProvider;
 import android.content.Context;
 import android.content.SharedPreferences;
+import android.graphics.Color;
 import android.widget.RemoteViews;
 
 public class MyWidgetProvider extends AppWidgetProvider {
@@ -12,16 +13,22 @@ public class MyWidgetProvider extends AppWidgetProvider {
     @Override
     public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
         prefs = context.getSharedPreferences(Constants.PREFS, Context.MODE_PRIVATE);
+        final RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget);
+        final int defaultColor = context.getResources().getColor(R.color.dark_grey);
+        final int newBgColor = prefs.getInt(Constants.WIDGET_BG_COLOR, defaultColor);
+        final int newTextColor = prefs.getInt(Constants.WIDGET_TEXT_COLOR, Color.WHITE);
+        remoteViews.setInt(R.id.notes_view, "setBackgroundColor", newBgColor);
+        remoteViews.setInt(R.id.notes_view, "setTextColor", newTextColor);
+
         for (int widgetId : appWidgetIds) {
-            updateWidget(context, appWidgetManager, widgetId);
+            updateWidget(appWidgetManager, widgetId, remoteViews);
         }
         super.onUpdate(context, appWidgetManager, appWidgetIds);
     }
 
-    private void updateWidget(Context context, AppWidgetManager widgetManager, int widgetId) {
+    private void updateWidget(AppWidgetManager widgetManager, int widgetId, RemoteViews remoteViews) {
         final String text = prefs.getString(Constants.TEXT, "");
-        final RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget);
+        remoteViews.setTextViewText(R.id.notes_view, text);
-        remoteViews.setTextViewText(R.id.notesView, text);
         widgetManager.updateAppWidget(widgetId, remoteViews);
     }
 }

app/src/main/res/layout/activity_main.xml

@@ -6,7 +6,7 @@
     android:padding="@dimen/activity_margin">
 
     <EditText
-        android:id="@+id/notesView"
+        android:id="@+id/notes_view"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:background="@null"

app/src/main/res/layout/widget.xml

@@ -5,10 +5,12 @@
     android:layout_height="match_parent">
 
     <TextView
-        android:id="@+id/notesView"
+        android:id="@+id/notes_view"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:background="@null"
         android:gravity="top"
+        android:padding="@dimen/activity_margin"
         android:textSize="18sp"/>
+
 </RelativeLayout>

app/src/main/res/layout/widget_config.xml

@@ -0,0 +1,66 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout
+    android:id="@+id/notes_holder"
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:layout_centerHorizontal="true"
+    android:layout_margin="@dimen/activity_margin"
+    android:paddingBottom="@dimen/activity_margin">
+
+    <TextView
+        android:id="@+id/notes_view"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_above="@+id/config_bg_color"
+        android:layout_marginBottom="@dimen/activity_margin"
+        android:background="@null"
+        android:gravity="top"
+        android:padding="@dimen/activity_margin"
+        android:text="hello world"
+        android:textSize="18sp"/>
+
+    <Button
+        android:id="@+id/config_bg_color"
+        android:layout_width="50dp"
+        android:layout_height="50dp"
+        android:layout_above="@+id/config_text_color"/>
+
+    <RelativeLayout
+        android:id="@+id/config_bg_seekbar_holder"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_alignBottom="@+id/config_bg_color"
+        android:layout_alignTop="@+id/config_bg_color"
+        android:layout_toRightOf="@+id/config_bg_color"
+        android:background="@android:color/white">
+
+        <SeekBar
+            android:id="@+id/config_bg_seekbar"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_centerVertical="true"
+            android:paddingLeft="@dimen/activity_margin"
+            android:paddingRight="@dimen/activity_margin"/>
+    </RelativeLayout>
+
+    <Button
+        android:id="@+id/config_text_color"
+        android:layout_width="50dp"
+        android:layout_height="50dp"
+        android:layout_alignParentBottom="true"/>
+
+    <Button
+        android:id="@+id/config_save"
+        android:layout_width="wrap_content"
+        android:layout_height="match_parent"
+        android:layout_alignBottom="@+id/config_text_color"
+        android:layout_alignParentRight="true"
+        android:layout_alignTop="@+id/config_text_color"
+        android:paddingLeft="@dimen/activity_margin"
+        android:paddingRight="@dimen/activity_margin"
+        android:text="OK"
+        android:textColor="@android:color/white"
+        android:textSize="18sp"/>
+
+</RelativeLayout>

app/src/main/res/values/colors.xml

@@ -3,4 +3,5 @@
     <color name="colorPrimary">#3F51B5</color>
     <color name="colorPrimaryDark">#303F9F</color>
     <color name="colorAccent">#FF4081</color>
+    <color name="dark_grey">#88000000</color>
 </resources>

app/src/main/res/values/styles.xml

@@ -6,4 +6,9 @@
         <item name="colorAccent">@color/colorAccent</item>
     </style>
 
+    <style name="MyWidgetConfigTheme" parent="@style/AppTheme">
+        <item name="android:windowBackground">@android:color/transparent</item>
+        <item name="android:windowShowWallpaper">true</item>
+    </style>
+
 </resources>

app/src/main/res/xml/widget_info.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
+                    android:configure="notes.simplemobiletools.com.MyWidgetConfigure"
                     android:initialLayout="@layout/widget"
                     android:minHeight="110dp"
                     android:minWidth="110dp">