在 Android 上使用多个内容视图(XML 和画布)

Question

我在使用画布绘制数学方程式和文本以及屏幕底部的文本框输入结果数据时遇到问题。 在我当前的设置中，我可以拥有按钮和文本框，或者公式和变量名称。 这是我在 java 类中的代码

    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>

请协助我这样做。 此外，如果有人能告诉我如何从这样的文本字段中获取输入，那将很有帮助。 此外，我正在尝试使用尽可能少的XML来执行此操作。

Answer 1

你可以从View子类化你自己的，比如EquationView，这样视图就有你的onDraw方法（）。

然后在XML中，您将放置视图，例如

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

以及那些EditText和Button