Android中的畫布繪制路徑

Question

我是android的新手，我想編寫一個簡單的程序來檢測觸摸坐標並繪制觸摸的圓和路徑，我編寫一個簡單的程序，在觸摸周圍繪制一個圓並跟隨它，但是我仍然可以做到的接觸。 當我使用路徑啟動程序時，它崩潰了，當我刪除路徑時，它可以正常工作...

public class MainActivity extends Activity {

    float x = 0;
    float y = 0;
    LinearLayout layout; //declarea variabilor pentru desenarea cercului

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main); //specificarea 
        layout = (LinearLayout)findViewById(R.id.layout); //gasirea id 
        layout.addView(new CustomView(MainActivity.this));
    }

    public class CustomView extends View { //crearea unei mape pentru canvas
        Bitmap mBitmap;
        Paint paint;
        Path path;

        public CustomView(Context context) {
        super(context);
        mBitmap = Bitmap.createBitmap(640, 1024, Bitmap.Config.ARGB_8888);
            paint = new Paint();
            path = new Path();
            paint.setColor(Color.BLUE);//culoare cercului desenat
            paint.setStyle(Style.FILL);
        }

    protected void onDraw(Canvas canvas) {//desenarea cercului la atingere
        super.onDraw(canvas);
        canvas.drawPath(path,paint);
        canvas.drawCircle(x, y, 25, paint);
    }

    public boolean onTouchEvent(MotionEvent event) {

        int action = event.getAction();

        switch (action){
            case MotionEvent.ACTION_DOWN:
                path.moveTo(event.getX(), event.getY());
                path.lineTo(event.getX(), event.getY());
                break;
            case MotionEvent.ACTION_MOVE:
                x = event.getX();
                y = event.getY();
                path.lineTo(x, y);
                invalidate();
                break;
            case MotionEvent.ACTION_UP:
                path.lineTo(event.getX(), event.getY());
                break;
            case MotionEvent.ACTION_CANCEL:
                break;
            default:
            break;
        }
        return true;
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

}

Answer 1

您沒有初始化path 。 最有可能的是，您的程序由於NullPointerException而崩潰。 嘗試將其添加到CustomView構造函數中：

path = new Path();

將來，當您發布有關Android程序崩潰的信息時，如果您從崩潰中發布了logcat輸出，那將是最有幫助的。