Android - 在 TouchImageView 上使用位图绘制线条

Question

基本上我想在图像上画线，这样当图像被缩放时，线也会按比例缩放，或者任何类型的交互，如滑动或缩放重置。我使用 TouchImageView 作为我的 ImageView，这是我的代码

public class ParkA extends Activity{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.parka);
        TouchImageView parka = (TouchImageView) findViewById(R.id.parka);
        parka.setImageResource(R.drawable.parka);

        Bitmap lineABmp = Bitmap.createBitmap(480, 640, Bitmap.Config.ARGB_8888);
        Canvas lineACanvas = new Canvas(lineABmp);
        Paint paint = new Paint();
        paint.setColor(Color.GREEN);
        paint.setStrokeWidth(10);
        lineACanvas.drawBitmap(lineABmp,0 ,0, null);
        //lineACanvas.drawLine(60, 64, 60, 500, paint);

        TouchImageView linea = new TouchImageView(this);
        linea = (TouchImageView) findViewById(R.id.parka);
        linea.setImageBitmap(lineABmp);

    }

    @Override
    protected void onResume() {
        super.onResume();


    }

    @Override
    protected void onPause() {


        super.onPause();
    }

    @Override
    protected void onNewIntent(Intent intent) {


    }

    @Override
    public void onBackPressed() {
        //Do Nothing
    }

}

这是我的xml文件

<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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.kmparkit.ParkA" >

    <com.km.parkit.TouchImageView
        android:id="@+id/parka"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:contentDescription="@string/imageDesc"
        android:scaleType="matrix"  />
        <!-- android:src="@drawable/parka" --> 

</RelativeLayout>

如果我更改 Bitmap.createBitmap(480, 640, Bitmap.Config.ARGB_8888);

进入Bitmap.createBitmap(parka.getWidth(), parka.getHeight(), Bitmap.Config.ARGB_8888);

logcat 说宽度和高度必须 > 0

如果我画线，只会显示绿线本身

为了创建一个画有线条的 TouhImageView 图片，我在这里缺少什么？

更新:

这是解决方案!

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

        TouchImageView parka = (TouchImageView) findViewById(R.id.parka);
        parka.setImageResource(R.drawable.parka);

        Bitmap lineABmp = ((BitmapDrawable)parka.getDrawable()).getBitmap();
        Bitmap lineAMutBmp = lineABmp.copy(Bitmap.Config.ARGB_8888, true);

        Canvas lineACanvas = new Canvas(lineAMutBmp);
        Paint paint = new Paint();
        paint.setColor(Color.GREEN);
        paint.setStrokeWidth(10);
        lineACanvas.drawLine(82, 1058, 82, 858, paint);

        parka.setImageBitmap(lineAMutBmp);
    }

我必须复制位图以使其可变并使用 parka.setImageResource(); 和 parka.setImageBitmap() 来显示图片和线条在一个 TouchImageView 中使用 Canvas 绘制线条。

Answer 1

尝试这样的事情:

编辑:这应该可以解决问题；)

    setContentView(R.layout.parka);
    TouchImageView parka = (TouchImageView) findViewById(R.id.parka);
    parka.setImageResource(R.drawable.parka);
    Bitmap lineABmp = ((BitmapDrawable)parka.getDrawable()).getBitmap();

    Bitmap copy = Bitmap.createBitmap(lineABmp);

    Canvas lineACanvas = new Canvas(copy);
    Paint paint = new Paint();
    paint.setColor(Color.GREEN);
    paint.setStrokeWidth(10);
    lineACanvas.drawLine(60, 64, 60, 500, paint);

    parka.setImageBitmap(copy);

快乐编码:D