Android 工作室 SurfaceView onTouchEvent

Question

我的 activity xml 中有一个 SurfaceView，我想在单击 SurfaceView 时获取一些信息。为此，我有一个 class 如下所示

class ImageTable extends SurfaceView implements SurfaceHolder.Callback {

 public ImageTable(Context context, SurfaceView surfaceView) {
        super(context);

        surfaceHolder =  surfaceView.getHolder();//getHolder();//
        surfaceHolder.addCallback(this);
        this.context = context;
        setFocusable(true);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        Log.i(TAG,String.valueOf( event.getAction())+"asd");
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                
                break;
            case MotionEvent.ACTION_MOVE:
                
                break;

            case MotionEvent.ACTION_UP:

                break;
        }
    return true;
    }
}

我的activity是


public class SubmitActivity extends AppCompatActivity {

SurfaceView test;

protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_submit);
        test = findViewById(R.id.cylindersImage);
        context = this;

        imageTable = new ImageTable(this,test);
}
}

和xml文件


<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">


    <SurfaceView
        android:id="@+id/cylindersImage"
        android:layout_width="358dp"
        android:layout_height="219dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.49"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.05">

    </SurfaceView>
</androidx.constraintlayout.widget.ConstraintLayout>

onTouchEvent 不适用于这种方式，但如果我通过 test.setOnTouchListener(...) 设置它，它会起作用。我想我应该将 SurfaceView 测试与 ImageTable 联系起来，但我不知道该怎么做。我还在 ImageTable 中绘制了一些代码，它们工作正常，所有内容都在 SurfaceView 测试中绘制

如果我不在 xml 文件上声明任何 SurfaceView 并执行 setContenView(new ImageTable(...)) 并将 surfaceHolder 设置为 SurfaceHolder surfaceHolder = getHolder() 事件有效。

Answer 1

首先在视图 class 上实现 View.OnTouchListener 界面。之后连接视图和侦听器。也不要忘记 ACTION_CANCEL case

public class SubmitActivity extends AppCompatActivity implements View.OnTouchListener // implement interface {

SurfaceView test;

protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_submit);
        test = findViewById(R.id.cylindersImage);
        context = this;

        imageTable = new ImageTable(this,test);
        imageTable.setOnTouchListener(this) // connect interface and view
}

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        Log.i(TAG,String.valueOf( event.getAction())+"asd");
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                
                break;
            case MotionEvent.ACTION_MOVE:
                
                break;

            case MotionEvent.ACTION_UP:

                break;
            case MotionEvent.ACTION_CANCEL:
                // usually handles when you make fast moves with finger
                // don't forget about it, it handles often
                break;
        }
    return true;
    }

}

class ImageTable extends SurfaceView implements SurfaceHolder.Callback {

 public ImageTable(Context context, SurfaceView surfaceView) {
        super(context);

        surfaceHolder =  surfaceView.getHolder();//getHolder();//
        surfaceHolder.addCallback(this);
        this.context = context;
        setFocusable(true);
    }
}

因此，如果您想在 ImageTable class 中实现它，请尝试这样做

class ImageTable extends SurfaceView implements SurfaceHolder.Callback, View.OnTouchListener {

 public ImageTable(Context context, SurfaceView surfaceView) {
        super(context);

        surfaceHolder =  surfaceView.getHolder();//getHolder();//
        surfaceHolder.addCallback(this);
        this.context = context;
        setFocusable(true);


        surfaceView.setOnTouchListener(this);
    }
}

@Override
    public boolean onTouchEvent(MotionEvent event) {
    ...implement event....

Android 工作室 SurfaceView onTouchEvent

Android studio SurfaceView onTouchEvent

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