StackOverflow2013

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POAndroid correct MVC coding to display a shape
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copied!<p>I have recently started working with android in eclipse. I have to keep within the Model-View-Controller (MVC) structure.</p> <p>My goal is simply to display a rectangle box on screen. What I have got at the minute is a application that has four screens (main menu and the three other screens linked to it). The box implementation is for one of these three screens (board)</p> <p>board.java code</p> <pre><code>package com.example.connectfour; import com.example.connectfour.model.Gaps; import com.example.connectfour.view.ConnectFourView; imports[..] public class Board extends Activity { private Button btnExit; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); connectfourView = new ConnectFourView(this); setContentView(R.layout.board); btnExit = (Button)findViewById(R.id.btn4); btnExit.setOnClickListener(new OnClickListener(){ public void onClick(View v){ Intent startMain = new Intent(Board.this, MainActivity.class); startActivity(startMain); } }); } } </code></pre> <p>board.xml</p> <pre><code><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" android:background="#48D9AB"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:text="Play" tools:context=".Board" /> <Button android:id="@+id/btn4" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_alignParentBottom="true" android:text="Exit" /> </RelativeLayout> </code></pre> <p>ConnectFourView.java code</p> <pre><code>package com.example.connectfour.view; import com.example.connectfour.model.Gaps; imports[..] public class ConnectFourView extends View { public ConnectFourView(Context context) { super(context); setMinimumWidth(100); setMinimumHeight(20); } protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int width = Math.max(getSuggestedMinimumWidth(),widthMeasureSpec); int height = Math.max(getSuggestedMinimumHeight(), heightMeasureSpec); setMeasuredDimension(width, height); } protected void onDraw(Canvas canvas){ canvas.drawColor(Color.WHITE); } } </code></pre> <p>I have tried the following code in board.xml file which I believe would bring it all together however when a insert this it my application sends 30+ errors to logcat.</p> <pre><code> <example.connectfour.view android:layout_width="fill_parent" android:layout_height="wrap_content"/> </code></pre> <p>Note: As this is my first android post I am sorry in advance for any missing/additional code. Thanks you</p> <p>EDIT for TanjaV. errors i get in logcat (these all appear when the above code is added to the board.xml file.</p> <pre><code>11-20 19:14:56.446: E/AndroidRuntime(630): FATAL EXCEPTION: main 11-20 19:14:56.446: E/AndroidRuntime(630): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.connectfour/com.example.connectfour.Board}: android.view.InflateException: Binary XML file line #23: Error inflating class com.example.connectfour.view.ConnectFourView 11-20 19:14:56.446: E/AndroidRuntime(630): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 11-20 19:14:56.446: E/AndroidRuntime(630): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 11-20 19:14:56.446: E/AndroidRuntime(630): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 11-20 19:14:56.446: E/AndroidRuntime(630): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 11-20 19:14:56.446: E/AndroidRuntime(630): at android.os.Handler.dispatchMessage(Handler.java:99) 11-20 19:14:56.446: E/AndroidRuntime(630): at android.os.Looper.loop(Looper.java:123) 11-20 19:14:56.446: E/AndroidRuntime(630): at android.app.ActivityThread.main(ActivityThread.java:4627) 11-20 19:14:56.446: E/AndroidRuntime(630): at java.lang.reflect.Method.invokeNative(Native Method) 11-20 19:14:56.446: E/AndroidRuntime(630): at java.lang.reflect.Method.invoke(Method.java:521) 11-20 19:14:56.446: E/AndroidRuntime(630): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 11-20 19:14:56.446: E/AndroidRuntime(630): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 11-20 19:14:56.446: E/AndroidRuntime(630): at dalvik.system.NativeStart.main(Native Method) 11-20 19:14:56.446: E/AndroidRuntime(630): Caused by: android.view.InflateException: Binary XML file line #23: Error inflating class com.example.connectfour.view.ConnectFourView 11-20 19:14:56.446: E/AndroidRuntime(630): at android.view.LayoutInflater.createView(LayoutInflater.java:503) 11-20 19:14:56.446: E/AndroidRuntime(630): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:565) 11-20 19:14:56.446: E/AndroidRuntime(630): at android.view.LayoutInflater.rInflate(LayoutInflater.java:618) 11-20 19:14:56.446: E/AndroidRuntime(630): at android.view.LayoutInflater.inflate(LayoutInflater.java:407) 11-20 19:14:56.446: E/AndroidRuntime(630): at android.view.LayoutInflater.inflate(LayoutInflater.java:320) 11-20 19:14:56.446: E/AndroidRuntime(630): at android.view.LayoutInflater.inflate(LayoutInflater.java:276) 11-20 19:14:56.446: E/AndroidRuntime(630): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:198) 11-20 19:14:56.446: E/AndroidRuntime(630): at android.app.Activity.setContentView(Activity.java:1647) 11-20 19:14:56.446: E/AndroidRuntime(630): at com.example.connectfour.Board.onCreate(Board.java:28) 11-20 19:14:56.446: E/AndroidRuntime(630): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 11-20 19:14:56.446: E/AndroidRuntime(630): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 11-20 19:14:56.446: E/AndroidRuntime(630): ... 11 more 11-20 19:14:56.446: E/AndroidRuntime(630): Caused by: java.lang.NoSuchMethodException: ConnectFourView(Context,AttributeSet) 11-20 19:14:56.446: E/AndroidRuntime(630): at java.lang.Class.getMatchingConstructor(Class.java:660) 11-20 19:14:56.446: E/AndroidRuntime(630): at java.lang.Class.getConstructor(Class.java:477) 11-20 19:14:56.446: E/AndroidRuntime(630): at android.view.LayoutInflater.createView(LayoutInflater.java:475) 11-20 19:14:56.446: E/AndroidRuntime(630): ... 21 more </code></pre>

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