在Android中需要帮助自定义视图与多个按钮

Question

直到现在我通过扩展ImageView类完成了自定义视图。

现在，

我必须在屏幕上创建自定义视图和2个按钮。

我必须单独显示按钮和自定义视图。按钮不应超过自定义视图。

该怎么做..？

需要你的帮助........

我的示例代码..

package com.androiddom.customview;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.widget.ImageView;

public class CustomView extends ImageView {

     private Paint paint = new Paint();
     private Path path = new Path();

     public CustomView(Context context) {
         super(context);

         paint.setAntiAlias(true);
         paint.setColor(Color.GREEN);
         paint.setStyle(Paint.Style.STROKE);
         paint.setStrokeJoin(Paint.Join.ROUND);
         paint.setStrokeWidth(15f);

     }

     @Override
     protected void onDraw(Canvas canvas) {
         super.onDraw(canvas);       

         canvas.drawPath(path, paint);       
     }


    @Override
    public boolean onTouchEvent(MotionEvent event) {

        // Gives you x and y coordinates on the 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);

            return true;
        case MotionEvent.ACTION_MOVE:
            path.lineTo(pointX, pointY);             

            break;

        case MotionEvent.ACTION_UP:
             XYZ etc...

            break;
        default:
            return false;
        }


        postInvalidate();
        return true;
    }     

public void clear() {
        //Path path = new Path();
        path.reset();
        invalidate();
    }
}

目前我正在通过主要活动调用customview类，如下面的方法：

MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

    CustomeView tv = (CustomeView) 
    setContentView(tv);

    }
}

Answer 1

您尝试使用XML布局如下...

<LinearLayout 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:orientation="vertical" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <Button
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dip"
            android:layout_marginRight="10dip"
            android:layout_weight="1"
            android:text="Button 1" />

        <Button
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dip"
            android:layout_marginRight="10dip"
            android:layout_weight="1"
            android:text="Button 2" />
    </LinearLayout>

    <com.androiddom.customview
        android:id="@+id/custom_view"
        android:layout_width="match_parent"
        android:layout_height="0dip"
        android:layout_margin="20dip"
        android:layout_weight="1" >
    </com.androiddom.customview>

</LinearLayout>

<强>更新

假设，在XML布局名称activity_main.xml之上。现在，更新MainActivity.java如下......

MainActivity extends Activity implements OnClickListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        // Initialize your CustomeView object in this way 
        // then do what you want to do with this object
        CustomeView tv = (CustomeView) findViewById(R.id.custom_view);

        Button bt = (Button)findViewById(R.id.button);
        btPrevious.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) { 

        tv.clear();

    }

}

另一个更新：

创建一种新方法，清除CustomeView.java类中的图纸视图，如下所示......

// start new drawing
public void startNew() {
    canvas.drawColor(0, PorterDuff.Mode.CLEAR);
    invalidate();
}

然后在onClick() ...

中调用此方法

@Override
public void onClick(View v) { 

    tv.startNew();

}

您可以从DrawingView

找到有关自定义绘图的更多帮助