SurfaceView in the box
I am trying to find any tutorial that can help me put SurfaceView in the field. A pointer in the right direction would be awesome - without looking at it with your hand.
I would like to be able to distribute an area at the top of the screen, for example, to do buttons, etc., and then fill the rest. However, when I try to change the code I used for the full screen surfaceView to link to my xml, things go a little wrong.
My code for my main activity looks like this (I've removed a lot of bits that I don't think are relevant).
package com.example.mylistviewidea;
import android.os.Bundle;
etc...
public class MainActivity extends Activity implements OnTouchListener {
MyListView myListView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myListView = (MyListView) findViewById(R.id.surfaceView1);
}
class MyListView extends SurfaceView implements Runnable {
SurfaceHolder myHolder;
Thread myThread = null;
boolean isRunning = false;
// My Variables
long dT;
int myRed;
public MyListView(Context context) {
super(context);
myHolder = getHolder();
}
@Override
public void run() {
// TODO Auto-generated method stub
while (isRunning) {
if (!myHolder.getSurface().isValid())
continue;
Canvas canvas = myHolder.lockCanvas();
canvas.drawARGB(128, 0, 0, 0);
dT = SystemClock.uptimeMillis();
myRed = (int) ((int) 128*(1+Math.sin((double) dT/1000)));
}
}
}
}
My XML:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<SurfaceView
android:id="@+id/surfaceView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentLeft="true" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="@string/add_entries" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="@+id/button1"
android:text="@string/remove_entries" />
</RelativeLayout>
The error I am getting:
02-08 11:44:17.885: E/AndroidRuntime(10523): java.lang.RuntimeException: Unable
to start activity ComponentInfo{com.example.mylistviewidea/com.example.mylistviewidea.MainActivity}:
java.lang.ClassCastException: android.view.SurfaceView cannot be cast to
com.example.mylistviewidea.MyListView
Thanks in advance for your help!
Greetings,
Mike
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2 answers
You must have a custom view and use it in your xml.
First create this view
class MyListView extends SurfaceView implements Runnable {
SurfaceHolder myHolder;
Thread myThread = null;
boolean isRunning = true;
// My Variables
long dT;
int myRed;
public MyListView(Context context) {
super(context);
init();
}
public MyListView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public MyListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init() {
myHolder = getHolder();
myHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
@Override
public void run() {
// TODO Auto-generated method stub
while (isRunning) {
if (!myHolder.getSurface().isValid())
continue;
Canvas canvas = myHolder.lockCanvas();
canvas.drawARGB(128, 128, 0, 0);
dT = SystemClock.uptimeMillis();
myRed = (int) ((int) 128 * (1 + Math.sin((double) dT / 1000)));
myHolder.unlockCanvasAndPost(canvas);
}
}
}
Change your xml to
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<com.example.testant.MyListView
android:id="@+id/surfaceView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentLeft="true" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="add_entries" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="@+id/button1"
android:text="remove_entries" />
and change the main action
public class MainActivity extends Activity {
MyListView myListView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myListView = (MyListView) findViewById(R.id.surfaceView1);
new Thread(myListView).start();
}
}
Note that you also have a bug with the lock canvas, but that should work fine.
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