在Android上使用多个内容视图（XML和画布）

Question

我在使用画布绘制我的数学公式和文本以及在屏幕底部显示输入数据以获得结果的文本框时遇到问题。在我目前的设置中，我可以有按钮和文本框，或方程式和变量名称。下面是从Java类

package com.soraingraven.suprRef; 

import java.io.IOException; 
import java.io.InputStream; 

import android.app.Activity; 
import android.content.Context; 
import android.content.res.AssetManager; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.graphics.Typeface; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.view.Window; 
import android.view.WindowManager; 

public class PerfectGasLaw extends Activity { 
    class RenderView extends View { 
     //For the Text 
     Paint paint; 
     Typeface font; 

     //For the pics 
     Bitmap PGL; 

     public RenderView(Context context) { 
      super(context); 
      paint = new Paint(); 

      //Attempt to load the bitmaps 
      try {    
       AssetManager assetManager = context.getAssets(); 
       InputStream inputStream = assetManager.open("PerfGasLaw.png"); 
       BitmapFactory.Options options = new BitmapFactory.Options(); 
       options.inPreferredConfig = Bitmap.Config.ARGB_4444; 
       PGL = BitmapFactory.decodeStream(inputStream, null, options); 
       inputStream.close(); 
       Log.d("BitmapText", "bobargb8888.png format: " + PGL.getConfig()); 

      } catch (IOException e) { 
       e.printStackTrace(); 
      } finally { 
       //we should really close our input streams here. 
      } 
     } 

     //Drawing text and pics 
     protected void onDraw(Canvas canvas) { 
      paint.setColor(Color.BLUE); 
      paint.setTypeface(font); 
      paint.setTextSize(32); 
      paint.setTextAlign(Paint.Align.LEFT); 
      canvas.drawText("P = Pressure in Atmospheres", 25, 350, paint); 
      canvas.drawText("V = Volume in Liters", 25, 400, paint); 
      canvas.drawText("n = Number of moles", 25, 450, paint); 
      canvas.drawText("R = Gas Constant", 25, 500, paint); 
      canvas.drawText(" - (0.0821 Liter-Atmospheres/K/mole)", 50, 550, paint); 
      canvas.drawText("T = Temperature in K", 25, 600, paint); 
      canvas.drawText("If Constant Pressure - V1/V2 = T1/T2", 25, 650, paint); 
      canvas.drawText("If Constant Temperature - P1/P2 = V2/V1", 25, 700, paint); 
      canvas.drawText("If Constant Volume - P1/P2 = T1/T2", 25, 750, paint); 

      canvas.drawBitmap(PGL, 25, 25, null); 
      invalidate(); 
     } 
    } 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     setContentView(new RenderView(this)); 
    } 
} 

和XML

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="horizontal" > 


    <EditText 
     android:id="@+id/edit_message" 
     android:layout_width="0dp" 
     android:layout_height="wrap_content" 
     android:layout_gravity="bottom" 
     android:layout_weight="1" 
     android:ems="10" 
     android:hint="@string/edit_message" > 

     <requestFocus /> 
    </EditText> 


    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_gravity="bottom" 
     android:text="@string/button_send" /> 

</LinearLayout> 

请帮助我这样做我的代码。此外，如果任何人都可以告诉我如何从这样的文本字段获取输入信息，这将会有所帮助。此外，我正在尝试尽可能使用最少量的XML。

Answer 1

您可以从View继承自己的子类，例如EquationView，以便该视图具有您的onDraw方法（）。

然后，在你把你的视图中的XML，像

<mypackage.equation.EquationView ... 
    android:layout_width=... 
    android:layout_height=... 
/> 

与EditText沿和Button