feat: 优化代码

app/src/main/java/io/legado/app/ui/book/read/page/ChapterProvider.kt

@@ -294,5 +294,5 @@ object ChapterProvider {
     }
 
     val TextPaint.textHeight: Float
-        get() = this.fontMetrics.descent - fontMetrics.ascent + fontMetrics.leading
+        get() = fontMetrics.descent - fontMetrics.ascent + fontMetrics.leading
 }

app/src/main/java/io/legado/app/ui/book/read/page/ContentView.kt

@@ -71,7 +71,12 @@ class ContentView(context: Context) : FrameLayout(context) {
             }
             if (hideStatusBar) {
                 tv_bottom_left.text = timeFormat.format(Date(System.currentTimeMillis()))
-                tv_bottom_right.text = context.getString(R.string.battery_show, battery)
+                tv_bottom_right.gone()
+                battery_view.visible()
+                battery_view.setBattery(battery)
+            } else {
+                tv_bottom_right.visible()
+                battery_view.gone()
             }
         }
     }
@@ -98,7 +103,7 @@ class ContentView(context: Context) : FrameLayout(context) {
     fun upBattery(battery: Int) {
         this.battery = battery
         if (ReadBookConfig.hideStatusBar) {
-            tv_bottom_right.text = context.getString(R.string.battery_show, battery)
+            battery_view.setBattery(battery)
         }
     }
 

app/src/main/java/io/legado/app/ui/widget/BatteryView.kt

@@ -0,0 +1,50 @@
+package io.legado.app.ui.widget
+
+import android.content.Context
+import android.graphics.Canvas
+import android.graphics.Paint
+import android.graphics.Rect
+import android.graphics.Typeface
+import android.text.StaticLayout
+import android.text.TextPaint
+import android.util.AttributeSet
+import android.view.View
+import io.legado.app.utils.dp
+
+class BatteryView(context: Context, attrs: AttributeSet?) : View(context, attrs) {
+    private var battery = 100
+    private val textPaint = TextPaint()
+    private var batteryHeight: Int = 0
+    private var batteryWidth: Int = 0
+    private val outFrame = Rect()
+    private val polar = Rect()
+
+    init {
+        textPaint.isAntiAlias = true
+        textPaint.textAlign = Paint.Align.CENTER
+        textPaint.typeface = Typeface.createFromAsset(context.assets, "number.ttf")
+        batteryHeight = with(textPaint.fontMetrics) { descent - ascent + leading }.toInt() + 4.dp
+        batteryWidth = StaticLayout.getDesiredWidth("100", textPaint).toInt() + 5.dp
+        outFrame.set(0, 0, batteryWidth - 2.dp, batteryHeight)
+        polar.set(outFrame.right, batteryHeight / 4, batteryWidth, batteryHeight * 3 / 4)
+    }
+
+    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
+        super.onMeasure(batteryWidth, batteryHeight)
+    }
+
+    fun setBattery(battery: Int) {
+        this.battery = battery
+        invalidate()
+    }
+
+    override fun onDraw(canvas: Canvas) {
+        super.onDraw(canvas)
+        canvas.drawRect(polar, textPaint)
+        textPaint.style = Paint.Style.STROKE
+        canvas.drawRect(outFrame, textPaint)
+        val text = battery.toString()
+        canvas.drawText(text, outFrame.right / 2.toFloat(), batteryHeight / 2.toFloat(), textPaint)
+    }
+
+}

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

@@ -51,6 +51,7 @@
         android:id="@+id/ll_footer"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
+        android:gravity="center_vertical"
         android:orientation="horizontal">
 
         <TextView
@@ -67,6 +68,11 @@
             android:layout_height="wrap_content"
             android:textSize="12sp" />
 
+        <io.legado.app.ui.widget.BatteryView
+            android:id="@+id/battery_view"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content" />
+
     </LinearLayout>
 
 </androidx.appcompat.widget.LinearLayoutCompat>