Question

解决方案

解决方案是添加onMeasure功能并在我的测试应用程序中重新调整我的绘图它不需要它，但由于测验应用程序中的scrollview它是必需的。这是我添加的代码：

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    setMeasuredDimension(widthMeasureSpec, resolveSize(800, heightMeasureSpec));

}

问题

我正在制作一个测验应用程序，其中一个问题中有一个地图，用户需要触摸他必须接受的电台，当按下电台时会突出显示。我在一个测试项目中为此做了一个自定义视图。它工作得很好。但现在我想通过以编程方式将其添加到线性布局中，将自定义视图放入我的测验应用程序，但问题是没有显示。

这是自定义视图：

公共类BrushView扩展了View {

private Paint brush = new Paint();
private Path path = new Path();
public Button btnEraseAll;
public LayoutParams params;
private Canvas mcanvas;
float mX;
float mY;
TextView mTVCoordinates;
ArrayList<Coordinates> coordinates = new ArrayList<Coordinates>();
Coordinates coord;
boolean alreadySelected = false;
int pos;


@SuppressLint("WrongCall")
public BrushView(Context context) {

    super(context);
    brush.setAntiAlias(true);
    brush.setColor(Color.BLUE);
    brush.setStyle(Paint.Style.STROKE);
    brush.setStrokeJoin(Paint.Join.ROUND);
    brush.setStrokeWidth(10f);

/*  params = new LayoutParams(LayoutParams.MATCH_PARENT,
            LayoutParams.WRAP_CONTENT);*/

}

@Override
public boolean onTouchEvent(MotionEvent event) {

    float pointX = event.getX();
    float pointY = event.getY();

    // Checks for the event that occurs
    switch (event.getAction()) {
    case MotionEvent.ACTION_DOWN:
        path.moveTo(pointX, pointY);
        mX = event.getX();
        mY = event.getY();

        Log.d("coordinates","x="+mX+ " y="+mY);

        if (mTVCoordinates != null) {
            mTVCoordinates.setText("X :" + mX + " , " + "Y :" + mY);
        }
        if ((mX > 200 && mX < 240) && (mY > 210 && mY < 235)) {
            // Draw the circle at (x,y) with radius 15
            mX = 230;
            mY = 220;
            if (coordinates.isEmpty()) {
                brush.setColor(Color.GREEN);
                path.addCircle(mX, mY, 15, Path.Direction.CW);
                coord = new Coordinates(mX, mY, path, Color.GREEN);
                coordinates.add(coord);
                path = new Path();
            } else {
                for (int i = 0; i < coordinates.size(); i++) {
                    Coordinates c = coordinates.get(i);
                    if (c.getX() == mX && c.getY() == mY) {
                        alreadySelected = true;
                        pos = i;
                    } 
                }
                if (alreadySelected) {
                    coordinates.remove(pos);
                } else{
                    brush.setColor(Color.GREEN);
                path.addCircle(mX, mY, 15, Path.Direction.CW);
                coord = new Coordinates(mX, mY, path, Color.GREEN);
                coordinates.add(coord);
                path = new Path();
                }
            }
        }
        if ((mX > 330 && mX < 360) && (mY > 125 && mY < 150)) {
            // Draw the circle at (x,y) with radius 15
            mX = 340;
            mY = 140;
            if (coordinates.isEmpty()) {
                brush.setColor(Color.GREEN);
                path.addCircle(mX, mY, 15, Path.Direction.CW);
                coord = new Coordinates(mX, mY, path, Color.GREEN);
                coordinates.add(coord);
                path = new Path();
            } else {
                for (int i = 0; i < coordinates.size(); i++) {
                    Coordinates c = coordinates.get(i);
                    if (c.getX() == mX && c.getY() == mY) {
                        alreadySelected = true;
                        pos = i;
                    } 
                }
                if (alreadySelected) {
                    coordinates.remove(pos);
                } else{
                    brush.setColor(Color.GREEN);
                path.addCircle(mX, mY, 15, Path.Direction.CW);
                coord = new Coordinates(mX, mY, path, Color.GREEN);
                coordinates.add(coord);
                path = new Path();
                }
            }
        }

        return true;
    case MotionEvent.ACTION_UP:
        postInvalidate();
        break;
    default:
        return false;
    }
    // Force a view to draw again
    postInvalidate();
    return false;

}

@Override
protected void onDraw(Canvas canvas) {

    super.onDraw(canvas);
    alreadySelected = false;
    Bitmap srcBitmapLocal = GlobalStatic.img;
    canvas.drawBitmap(srcBitmapLocal, 0, 0, brush);
    for (Coordinates c : coordinates) {
        brush.setColor(c.getC());
        canvas.drawPath(c.getP(), brush);
    }
}

这是活动的一部分：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_test);

    ctx = getBaseContext();
    activity = this;
    statementsLayout = (LinearLayout) findViewById(R.id.linearlayoutUp);
    btn_next = (Button) findViewById(R.id.btn_next);
    btn_previous = (Button) findViewById(R.id.btn_previous);
    btn_next.setOnClickListener(new ButtonHandler());
    btn_previous.setOnClickListener(new ButtonHandler());
    GlobalStatic.text = (TextView) this.findViewById(R.id.timer);
    countDownTimer = new MyCountDownTimer(startTime, interval);
    GlobalStatic.text.setText(GlobalStatic.text.getText() + String.valueOf(startTime / 1000));
    countDownTimer.start();

    setScreen(teller);
}

该部分是我尝试添加自定义视图 private void showStatementsAndAnswer（int id）{

    String statement_text;
    Bitmap statement_img;
    int statement_displayType;
    ArrayList<Statements> statementPerQuestion;
    ArrayList<Answer> answersPerStatement;

    statementPerQuestion = DbAccess.getStatementsPerQuestions(id);
    totalStatementsPerQuestion = statementPerQuestion.size();

    s = statementPerQuestion.get(statementcount); // get statement at position b

    statement_text = s.getText();
    statement_img = s.getImage();
    statement_displayType = s.getDisplaytype();

    // show the elements that are not null
    if (statement_text != null) {
        TextView S_text = new TextView(this);
        S_text.setText(statement_text);
        LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT,
                LayoutParams.WRAP_CONTENT);
        params.setMargins(0, 40, 0, 35);
        params.gravity = Gravity.CENTER;
        S_text.setLayoutParams(params);
        S_text.setTypeface(Typeface.create("sans-serif", Typeface.BOLD));
        S_text.setTextSize(18);
        statementsLayout.addView(S_text);
    }
    if (statement_img != null && statement_displayType != 5) {
        ImageView S_img = new ImageView(this);
        S_img.setImageBitmap(statement_img);
        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
                LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
        layoutParams.gravity = Gravity.CENTER;
        layoutParams.bottomMargin = 25;
        S_img.setLayoutParams(layoutParams);
        statementsLayout.addView(S_img);
    }
    //here is where i try to get my custom view shown!!!
    if(statement_img != null && statement_displayType == 5){
        GlobalStatic.img = statement_img;
        BrushView S_map = new BrushView(this);
        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
                LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
        S_map.setLayoutParams(layoutParams);
        statementsLayout.addView(S_map);
    }

    statementId = s.getId(); // add the statementID's to an array to get the answers later

    answersPerStatement = DbAccess.getAnswerPerStatement(s.getId()); // get possible answers per statement

    // show answer depending on what the displaytype is.
    if (statement_displayType == 1) {
        makeSpinner(1, answersPerStatement);
    } else if (statement_displayType == 3) {
        makeRadioButtons(answersPerStatement);
    } else if (statement_displayType == 2) {
        TextView[] views = new TextView[answersPerStatement.size()];

        for(int i = 0; i < answersPerStatement.size(); i++)
        {
            views[i] = new TextView(this);
            a = answersPerStatement.get(i);
            views[i].setText(a.getText());
            views[i].setId(a.getId()); // give the rb the same id as the answer in the db
            views[i].setTypeface(Typeface.create("sans-serif", Typeface.NORMAL));
            views[i].setTextSize(20);

        }

        populateText(statementsLayout, views, getBaseContext());
    } 
}

我对Android很新，从未使用自定义视图，因此示例代码可以帮助很多。

提前感谢!!

更新：

看起来像我的xml中的scrollview是导致事实没有显示的事情，但我需要任何滚动视图任何选项或想法如何解决？

Answer 1

我自己找到了解决方案，但我将其留在这里供其他人使用。

的解的

解决方案是添加onMeasure功能并在我的测试应用程序中重新调整我的绘图它不需要它，但由于测验应用程序中的scrollview它是必需的。这是我添加的代码：

@Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); setMeasuredDimension(widthMeasureSpec, resolveSize(800, heightMeasureSpec)); }

Answer 2

您是否已将容器视图添加到自定义视图中。像将所有视图添加到statementsLayout之后的addView（statementsLayout）。

CustomView不会在scrollview中显示，但需要scrollview

2 个答案: