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.
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.
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.
For Reference:
My code to create and add the view:
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);
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;
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 >= 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();
}
}
Here’s my XML File:
<?xml version="1.0" encoding="utf-8"?>
<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" >
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/layout"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:id="@+id/solarbg"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:src="@drawable/solarbg" />
</LinearLayout>
<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" />
<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" />
<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" />
<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" />
<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" />
<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" />
<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" />
<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" />
<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" />
<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" /><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" />
<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" />
<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" />
<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">
<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" />
</TableLayout>
</RelativeLayout>
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.
Try writing