Add Parametric EQ

app/src/main/AndroidManifest.xml

@@ -165,6 +165,16 @@
                 android:value=".activity.MainActivity" />
         </activity>
 
+        <activity
+            android:name=".activity.ParametricEqualizerActivity"
+            android:exported="false"
+            android:label="@string/title_activity_peq"
+            android:theme="@style/Theme.RootlessJamesDSP">
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value=".activity.MainActivity" />
+        </activity>
+
         <activity
             android:name=".activity.GraphicEqualizerActivity"
             android:exported="false"

app/src/main/java/me/timschneeberger/rootlessjamesdsp/activity/ParametricEqualizerActivity.kt

@@ -0,0 +1,25 @@
+package me.timschneeberger.rootlessjamesdsp.activity
+
+import android.os.Bundle
+import me.timschneeberger.rootlessjamesdsp.R
+import me.timschneeberger.rootlessjamesdsp.databinding.ActivityParametricEqBinding
+import me.timschneeberger.rootlessjamesdsp.fragment.ParametricEqualizerFragment
+
+class ParametricEqualizerActivity : BaseActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        val binding = ActivityParametricEqBinding.inflate(layoutInflater)
+
+        setContentView(binding.root)
+        setSupportActionBar(binding.toolbar)
+
+        if (savedInstanceState == null) {
+            supportFragmentManager
+                .beginTransaction()
+                .replace(R.id.params, ParametricEqualizerFragment.newInstance())
+                .commit()
+        }
+        supportActionBar?.setDisplayHomeAsUpEnabled(true)
+        binding.toolbar.setNavigationOnClickListener { onBackPressedDispatcher.onBackPressed() }
+    }
+}

app/src/main/java/me/timschneeberger/rootlessjamesdsp/adapter/ParametricEqBandAdapter.kt

@@ -0,0 +1,138 @@
+package me.timschneeberger.rootlessjamesdsp.adapter
+
+import android.annotation.SuppressLint
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import android.widget.TextView
+import androidx.databinding.ObservableArrayList
+import androidx.databinding.ObservableList
+import androidx.recyclerview.widget.RecyclerView
+import me.timschneeberger.rootlessjamesdsp.R
+import me.timschneeberger.rootlessjamesdsp.model.ParametricEqBand
+import me.timschneeberger.rootlessjamesdsp.model.ParametricEqBandList
+import java.text.DecimalFormat
+import java.text.DecimalFormatSymbols
+import java.util.*
+
+class ParametricEqBandAdapter(var bands: ParametricEqBandList) :
+    RecyclerView.Adapter<ParametricEqBandAdapter.ViewHolder>() {
+
+    private val dfFreq = DecimalFormat("0", DecimalFormatSymbols.getInstance())
+    private val dfGain = DecimalFormat("0", DecimalFormatSymbols.getInstance())
+    private val dfQ = DecimalFormat("0", DecimalFormatSymbols.getInstance())
+
+    init {
+        dfFreq.maximumFractionDigits = 1
+        dfGain.maximumFractionDigits = 2
+        dfQ.maximumFractionDigits = 2
+    }
+
+    var onItemsChanged: ((ParametricEqBandAdapter) -> Unit)? = null
+    var onItemClicked: ((ParametricEqBand, Int) -> Unit)? = null
+
+    private val callback = object : ObservableList.OnListChangedCallback<ObservableArrayList<ParametricEqBand>>() {
+        @SuppressLint("NotifyDataSetChanged")
+        override fun onChanged(sender: ObservableArrayList<ParametricEqBand>?) {
+            this@ParametricEqBandAdapter.notifyDataSetChanged()
+            onItemsChanged()
+        }
+
+        override fun onItemRangeChanged(
+            sender: ObservableArrayList<ParametricEqBand>?,
+            positionStart: Int,
+            itemCount: Int,
+        ) {
+            this@ParametricEqBandAdapter.notifyItemRangeChanged(positionStart, itemCount)
+            onItemsChanged()
+        }
+
+        override fun onItemRangeInserted(
+            sender: ObservableArrayList<ParametricEqBand>?,
+            positionStart: Int,
+            itemCount: Int,
+        ) {
+            this@ParametricEqBandAdapter.notifyItemRangeInserted(positionStart, itemCount)
+            onItemsChanged()
+        }
+
+        @SuppressLint("NotifyDataSetChanged")
+        override fun onItemRangeMoved(
+            sender: ObservableArrayList<ParametricEqBand>?,
+            fromPosition: Int,
+            toPosition: Int,
+            itemCount: Int,
+        ) {
+            this@ParametricEqBandAdapter.notifyDataSetChanged()
+            onItemsChanged()
+        }
+
+        override fun onItemRangeRemoved(
+            sender: ObservableArrayList<ParametricEqBand>?,
+            positionStart: Int,
+            itemCount: Int,
+        ) {
+            this@ParametricEqBandAdapter.notifyItemRangeRemoved(positionStart, itemCount)
+            onItemsChanged()
+        }
+    }
+
+    private fun onItemsChanged() {
+        this.onItemsChanged?.invoke(this)
+    }
+
+    class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {
+        val filterType: TextView = view.findViewById(R.id.filter_type)
+        val freq: TextView = view.findViewById(R.id.freq)
+        val gain: TextView = view.findViewById(R.id.gain)
+        val qFactor: TextView = view.findViewById(R.id.q_factor)
+        val deleteButton: Button = view.findViewById(R.id.delete)
+    }
+
+    override fun onAttachedToRecyclerView(recyclerView: RecyclerView) {
+        bands.addOnListChangedCallback(callback)
+        super.onAttachedToRecyclerView(recyclerView)
+    }
+
+    override fun onDetachedFromRecyclerView(recyclerView: RecyclerView) {
+        bands.removeOnListChangedCallback(callback)
+        super.onDetachedFromRecyclerView(recyclerView)
+    }
+
+    override fun onCreateViewHolder(viewGroup: ViewGroup, viewType: Int): ViewHolder {
+        val view = LayoutInflater.from(viewGroup.context)
+            .inflate(R.layout.item_peq_band_list, viewGroup, false)
+        return ViewHolder(view)
+    }
+
+    @SuppressLint("SetTextI18n")
+    override fun onBindViewHolder(viewHolder: ViewHolder, position: Int) {
+        viewHolder.deleteButton.isEnabled = true
+
+        val band = bands[position]
+        viewHolder.filterType.text = band.filterType.displayLabel
+        viewHolder.freq.text = "${dfFreq.format(band.frequency)}Hz"
+        viewHolder.gain.text = "${dfGain.format(band.gain)}dB"
+        viewHolder.qFactor.text = "Q${dfQ.format(band.q)}"
+
+        viewHolder.deleteButton.setOnClickListener {
+            viewHolder.bindingAdapterPosition.let { pos ->
+                if (pos >= 0) {
+                    bands.removeAt(pos)
+                }
+            }
+            viewHolder.deleteButton.isEnabled = false
+        }
+
+        viewHolder.itemView.setOnClickListener {
+            viewHolder.bindingAdapterPosition.let { pos ->
+                bands.getOrNull(pos)?.let {
+                    onItemClicked?.invoke(it, pos)
+                }
+            }
+        }
+    }
+
+    override fun getItemCount() = bands.size
+}

app/src/main/java/me/timschneeberger/rootlessjamesdsp/fragment/DspFragment.kt

@@ -88,6 +88,10 @@ class DspFragment : Fragment(), SharedPreferences.OnSharedPreferenceChangeListen
                 R.id.card_eq, PreferenceGroupFragment.newInstance(Constants.PREF_EQ,
                     R.xml.dsp_equalizer_preferences
                 ))
+            .replace(
+                R.id.card_peq, PreferenceGroupFragment.newInstance(Constants.PREF_PEQ,
+                    R.xml.dsp_parametriceq_preferences
+                ))
             .replace(
                 R.id.card_geq, PreferenceGroupFragment.newInstance(Constants.PREF_GEQ,
                     R.xml.dsp_graphiceq_preferences