title: Drawing a new view into a relative layout
body: <p>We are writing a "dashboard" for a car. The code for calculating/drawing the speedometer was done separate from the rest of the code, and now I am trying to combine the two.</p>
  
  <p>They both work separately, and with the speedometer view code in, the main portion of the UI is still functioning, I just can't see the speedometer.</p>
  
  <p>I have it compiling, and there are no obvious errors. However, when the app is run, I don't see the speedometer showing up in the main view, even though I have added it using the addView method. </p>
  
  <p>For Reference:</p>
  
  <p>My code to create and add the view:</p>
  
  <pre><code>    setContentView(R.layout.main); 
      RelativeLayout relativeLayout = (RelativeLayout) findViewById(R.id.RelativeLayout1);
      RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(RelativeLayout.CENTER_HORIZONTAL, RelativeLayout.CENTER_VERTICAL);
      myView v = new myView(this);
      v.setLayoutParams(lp);
      relativeLayout.addView(v, lp);
  </code></pre>
  
  <p>The code for the myView class:
      import android.content.Context;
      import android.graphics.Bitmap;
      import android.graphics.BitmapFactory;
      import android.graphics.Canvas;
      import android.graphics.Color;
      import android.graphics.Paint;
      import android.graphics.RectF;
      import android.graphics.Typeface;
      import android.view.View;</p>
  
  <pre><code>public class myView extends View {
      private Paint mPaints;
      private Paint textpaint;
      private boolean mUseCenters;
      private RectF mBigOval;
      private float mStart;
      private float mSweep;
      public float SPEED_raw;
      public int SPEED = 0;   //initialized to 0 just for loop.  Remove initialization when IF statement below is deleted
      public static Bitmap gaugefront;
      public static Bitmap gaugeback;
  
      public myView(Context context) {
          super(context);
          mPaints = new Paint();
          mPaints.setAntiAlias(true);
          mPaints.setColor(Color.YELLOW);
  
          textpaint = new Paint();
          textpaint.setAntiAlias(true);
          textpaint.setColor(Color.WHITE);
          textpaint.setTextSize(150);
          textpaint.setTypeface(Typeface.defaultFromStyle(Typeface.BOLD));
  
          gaugefront = BitmapFactory.decodeResource(context.getResources(),R.drawable.gaugefront);    //Load gaugefront.png
          gaugeback = BitmapFactory.decodeResource(context.getResources(),R.drawable.gaugeback);      //Load gaugeback.png
  
          mUseCenters = true;
          mBigOval = new RectF(400, 10, 880, 490);                //left[x-coordinate],top[y-coordinate],right[x],bottom[y]
      }
  
      private void drawArcs(Canvas canvas, RectF oval, boolean useCenter, Paint paint) {
          canvas.drawArc(oval, mStart, mSweep, useCenter, paint);
      }
  
      @Override 
      protected void onDraw(Canvas canvas) {
          canvas.drawBitmap(myView.gaugeback, 400, 10, null);     //draw gauge background, X coordinate:400, Y coordinate: 10
          drawArcs(canvas, mBigOval, mUseCenters, mPaints);
  
          //SPEED_raw = 70;                   //Raw float data from CCS. Uncomment when the IF statement below is deleted.
          SPEED = Math.round(SPEED_raw);      //SPEED integer.  Units km/h - Top speed of 135. Used for digital readout
  
          mStart = 90;                        //Start drawing from -90 degrees (Counter clockwise)                
          mSweep = SPEED_raw*2;               //Draw stop point
  
              if(SPEED &gt;= 135){           //JUST FOR SHOW.  Delete this for actual speedo
                  SPEED_raw = 0;          // "
              }                           // "
              else                        // "
                  SPEED_raw += 0.5;       // "
  
          canvas.drawBitmap(myView.gaugefront, 400, 10, null);                //draw gauge foreground, X coordinate:400, Y coordinate: 10
  
          String speed_string = String.valueOf(SPEED);                        //Convert int SPEED to String for display
  
  //            while (speed_string.endsWith(".0") || speed_string.endsWith(".")){            //Erase trailing ".0" for float types. Don't need if SPEED is an int
  //              speed_string = (speed_string.substring(0, speed_string.length() - 1));
  //            }
  
          canvas.drawText(speed_string, 640, 420, textpaint);                 //arguments: (string, x-coordinate, y-coordinate, paint)
  
          invalidate();
      }
  }
  </code></pre>
  
  <p>Here's my XML File:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/RelativeLayout1"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:gravity="center"
  android:keepScreenOn="true"
  android:orientation="vertical" &gt;
  
  &lt;LinearLayout
      xmlns:android="http://schemas.android.com/apk/res/android"
      android:id="@+id/layout"
      android:layout_width="match_parent"
      android:layout_height="match_parent" &gt;
  
  &lt;ImageView
      android:id="@+id/solarbg"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:src="@drawable/solarbg" /&gt;
  &lt;/LinearLayout&gt;
  
  &lt;ImageView
      android:id="@+id/l_lamp"
      android:layout_width="90dp"
      android:layout_height="90dp"
      android:layout_alignParentLeft="true"
      android:layout_alignParentTop="true"
      android:layout_gravity="left"
      android:src="@drawable/l_arrow_dim" /&gt;
  
  &lt;DigitalClock
      android:id="@+id/digitalClock1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignParentTop="true"
      android:layout_centerHorizontal="true"
      android:gravity="center"
      android:textColor="#ffffff"
      android:textSize="50dp" /&gt;
  
  &lt;ImageView
      android:id="@+id/r_lamp"
      android:layout_width="90dp"
      android:layout_height="90dp"
      android:layout_alignParentRight="true"
      android:layout_alignParentTop="true"
      android:src="@drawable/r_arrow_dim" /&gt;
  
  &lt;TextView
      android:id="@+id/setAmps"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignParentLeft="true"
      android:layout_centerVertical="true"
      android:gravity="left"
      android:text="@string/setAmps"
      android:textColor="#ffffff"
      android:textSize="30dp" /&gt;
  
  &lt;TextView
      android:id="@+id/setAmpsVal"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:gravity="left"
      android:layout_below = "@+id/setAmps"
      android:layout_alignParentLeft="true"
      android:maxEms = "5"
      android:textColor="#ffffff"
      android:textSize="30dp" /&gt;
  
  &lt;TextView
      android:id="@+id/setVelocity"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignBottom="@+id/setAmps"
      android:layout_alignParentRight="true"
      android:layout_centerVertical="true"
      android:gravity="right"
      android:text="@string/setVelocity"
      android:textColor="#ffffff"
      android:textSize="30dp" /&gt;
  
      &lt;TextView
      android:id="@+id/setVelocityVal"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:gravity="right"
      android:layout_below = "@+id/setVelocity"
      android:layout_alignParentRight="true"
      android:maxEms = "5"
      android:textColor="#ffffff"
      android:textSize="30dp" /&gt;
  
  &lt;TextView
      android:id="@+id/actVelocity"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignParentRight="true"
      android:layout_below="@+id/setVelocityVal"
      android:gravity="right"
      android:text="@string/actVelocity"
      android:textColor="#ffffff"
      android:textSize="30dp" /&gt;
  
  &lt;TextView
      android:id="@+id/actVelocityVal"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_below = "@+id/actVelocity"
      android:layout_alignParentRight="true"
      android:gravity="right"
      android:maxEms = "5"
      android:textColor="#ffffff"
      android:textSize="30dp" /&gt;
  
  &lt;TextView
      android:id="@+id/busAmps"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignParentLeft="true"
      android:layout_below="@+id/setAmpsVal"
      android:gravity="left"
      android:text="@string/busAmps"
      android:textColor="#ffffff"
      android:textSize="30dp" /&gt;&lt;TextView
      android:id="@+id/busAmpsVal"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:gravity="left"
      android:layout_below = "@+id/busAmps"
      android:maxEms = "5"
      android:textColor="#ffffff"
      android:textSize="30dp" /&gt;
  
    &lt;TextView
      android:id="@+id/powerVal"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignParentRight="true"
      android:layout_alignParentBottom = "true"
      android:gravity="right"
      android:textColor="#ffffff"
      android:textSize="30dp" /&gt;
  
  &lt;TextView
      android:id="@+id/power"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignParentRight="true"
      android:layout_above = "@+id/powerVal"
      android:gravity="left"
      android:text="@string/power"
      android:textColor="#ffffff"
      android:textSize="30dp" /&gt;
  
  
   &lt;TableLayout
      android:id="@+id/msgCenterLayout"
      android:layout_width="600dp"
      android:layout_height="200dp" 
      android:layout_alignParentBottom = "true" 
      android:layout_centerHorizontal = "true"
      android:orientation = "vertical"
      android:visibility = "invisible"&gt;
  
  &lt;ScrollView
      android:id="@+id/messageCenterText"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:gravity="left"
      android:text="@string/busAmps"
      android:textColor="#ffffff"
      android:textSize="30dp" /&gt;
  
  
  &lt;/TableLayout&gt;
  
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p>edit:
  I'm using an XML file for the main layout, and trying to add this new view to a relativelayout inside that XML file.</p>