I'm creating an app in Android Studio, and I need to have one part of one of the Activity screens which shows a grid. I'm having difficulty in getting this set up, though. I've cut it back so that it should just display some text in the appropriate area, but even that's not showing up. I'm very new to Android Studio, and fairly new to Java, so am now stuck and hoping someone can help.
So far I have the following: Layout file (relevant section): <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"; xmlns:custom="http://schemas.android.com/apk/res/com.example.packagename"; android:layout_width="match_parent" android:layout_height="match_parent"> <com.example.mypackagename.PatternGrid android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/patternGrid" /> </LinearLayout> Attributes file: <?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="PatternGrid"> </declare-styleable> </resources> PatternGrid class: package com.example.mypackagename; import... public class PatternGrid extends View { // Define paint and canvas Paint gridPaint = new Paint(); Bitmap gridBitmap; Canvas gridCanvas; public PatternGrid(Context context, AttributeSet attrs) { super(context, attrs); gridPaint = new Paint(Paint.ANTI_ALIAS_FLAG); gridPaint.setColor(Color.BLACK); gridBitmap = Bitmap.createBitmap(100, 100, Bitmap.Config.ARGB_8888); gridCanvas = new Canvas(gridBitmap); } protected void onDraw(Canvas canvas) { super.onDraw(canvas); // Draw the label text canvas.drawText("Testing", 0, 0, 0, 0, gridPaint); } } And the relevant part of the Activity class: package **; import ** public class EditPattern extends AppCompatActivity { // Drawing grid PatternGrid patternGrid; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_edit_pattern); patternGrid = (PatternGrid) findViewById(R.id.patternGrid); } } When I run this, I don't see anything - just a blank screen. I can't see anything in the error log that looks relevant. I'm guessing that I need to call patternGrid.draw(), but when I do that it says I need to pass in the Canvas variable. I tried declaring a canvas variable in the EditPattern class (which calls the patternGrid class), which allowed me to call draw(), but it still didn't show anything. Can anyone suggest what I'm doing wrong here? -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to android-developers+unsubscr...@googlegroups.com. To post to this group, send email to android-developers@googlegroups.com. Visit this group at https://groups.google.com/group/android-developers. To view this discussion on the web visit https://groups.google.com/d/msgid/android-developers/e28e3d4d-29a0-4788-8c47-17f71a50bbc6%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
