I am working Drawing Application. I am Draw View Class Extends View for Drawing Below For Draw.java class:
package com.draw; import java.util.ArrayList; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Path; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.widget.ImageView; public class DrawView extends View implements OnTouchListener { private Canvas mCanvas; private Path mPath; private Paint mPaint; private ArrayList<Path> paths = new ArrayList<Path>(); private ArrayList<Path> undonePaths = new ArrayList<Path>(); private Bitmap im; public DrawView(Context context) { super(context); setFocusable(true); setFocusableInTouchMode(true); this.setOnTouchListener(this); mPaint = new Paint(); mPaint.setAntiAlias(true); mPaint.setDither(true); mPaint.setColor(0xFFFFFFFF); mPaint.setStyle(Paint.Style.STROKE); mPaint.setStrokeJoin(Paint.Join.ROUND); mPaint.setStrokeCap(Paint.Cap.ROUND); mPaint.setStrokeWidth(6); mCanvas = new Canvas(); mPath = new Path(); paths.add(mPath); im=BitmapFactory.decodeResource(context.getResources(),R.drawable.ic_launcher); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); } @Override protected void onDraw(Canvas canvas) { for (Path p : paths){ canvas.drawPath(p, mPaint); } } private float mX, mY; private static final float TOUCH_TOLERANCE = 4; private void touch_start(float x, float y) { mPath.reset(); mPath.moveTo(x, y); mX = x; mY = y; } private void touch_move(float x, float y) { float dx = Math.abs(x - mX); float dy = Math.abs(y - mY); if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) { mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2); mX = x; mY = y; } } private void touch_up() { mPath.lineTo(mX, mY); // commit the path to our offscreen mCanvas.drawPath(mPath, mPaint); // kill this so we don't double draw mPath = new Path(); paths.add(mPath); } public void onClickUndo () { if (paths.size()>0) { undonePaths.add(paths.remove(paths.size()-1)); invalidate(); } else { } //toast the user } public void onClickRedo (){ if (undonePaths.size()>0) { paths.add(undonePaths.remove(undonePaths.size()-1)); invalidate(); } else { } //toast the user } @Override public boolean onTouch(View arg0, MotionEvent event) { float x = event.getX(); float y = event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: touch_start(x, y); invalidate(); break; case MotionEvent.ACTION_MOVE: touch_move(x, y); invalidate(); break; case MotionEvent.ACTION_UP: touch_up(); invalidate(); break; } return true; } } And I am mentioned my layout below :
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <RelativeLayout android:id="@+id/relativeLayout1" android:layout_width="fill_parent" android:layout_height="fill_parent" > <com.draw.DrawView android:id="@+id/view1" android:layout_width="fill_parent" android:layout_height="400dp" /> <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:text="Undo" /> <Button android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_centerHorizontal="true" android:text="Redo" /> </RelativeLayout> </LinearLayout> And My Activity Class Code Below:
package com.draw; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ImageButton; import android.widget.Toast; public class Draw extends Activity { DrawView draw_view ; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //drawView = new DrawView(this); setContentView(R.layout.main); //drawView.requestFocus(); try { draw_view=(DrawView) findViewById(R.id.view1); } catch (Exception e) { // TODO: handle exception Toast.makeText(getApplicationContext(), e.toString(),4000).show(); } Button btn_undo=(Button) findViewById(R.id.button1); btn_undo.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub draw_view.onClickUndo(); } }); } } Xml Load Error Occured in Logcat
05-15 16:27:01.407: E/AndroidRuntime(1064): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.draw/com.draw.Draw}: android.view.InflateException: Binary XML file line #13: Error inflating class com.draw.DrawView What's wrong in my code?