自定义Android EditText不起作用

时间:2012-04-11 00:39:13

标签: android android-edittext android-view android-custom-view

我正在尝试在onDraw()中实施自定义EditText方法。 onDraw被调用 - 我可以看到日志消息,但它没有绘制任何东西。

有谁能告诉我我做错了什么?

以下是我的布局摘录:     

    <view xmlns:android="http://schemas.android.com/apk/res/android"
          class ="my.package.NotePadEditView"
            android:inputType="textMultiLine"
            android:id="@+id/edit_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="top"
            android:background="@android:color/transparent"
            android:singleLine="false"
            >
        <requestFocus/>
    </view>
</ScrollView>

这是课程(现在只有一些测试代码):

public class NotePadEditView extends EditText {
Paint paint = new Paint();
public NotePadEditView(Context context, AttributeSet attrs, int defStyle) {
   super(context, attrs, defStyle);
   paint.setStyle(Paint.Style.STROKE);
   paint.setStrokeWidth(3);
   paint.setColor(0xFF0000);
 }
 @Override
 protected void onDraw(Canvas canvas) {
   Log.d("NotePadEditView", "Calling onDraw()"); // These log messages are displaying
   canvas.drawLine(0, 0, 50, 50, paint); // just some random stuff so we know when we are done. (Note: these are not displaying - what's up with that???)
   canvas.drawText("Hello, World", 30, 30, paint);
   super.onDraw(canvas);
  }

// more constructors, etc

2 个答案:

答案 0 :(得分:2)

我认为你应该尝试这个东西来在Android布局的xml中使用Custom EditText。

以下是我在班级中所做的一些改变。

public class NotePadEditView extends EditText{
@Override
protected void onDraw(Canvas canvas) {

    Log.d("NotePadEditView", "Calling onDraw()"); // These log messages are displaying
       canvas.drawLine(0, 0, 50, 50, paint); // just some random stuff so we know when we are done. (Note: these are not displaying - what's up with that???)
       canvas.drawText("Hello, World", 30, 30, paint);
       super.onDraw(canvas);

}
Paint paint;

public NotePadEditView(Context context, AttributeSet attrs){
    super(context, attrs);
    //this Contructure required when you are using this view in xml 
    paint = new Paint();
    paint.setStyle(Paint.Style.STROKE);
    paint.setStrokeWidth(3);
    paint.setColor(Color.BLUE);
}

public NotePadEditView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    paint = new Paint();
    paint.setStyle(Paint.Style.STROKE);
    paint.setStrokeWidth(3);
    paint.setColor(0xFF0000);

   }

}

在你的xml中使用,

   <my.package.NotePadEditView 
            android:id="@+id/edit_text"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:background="@android:color/transparent"
            android:gravity="top"
            android:inputType="textMultiLine"
            android:singleLine="false" />

希望这会使你的工作。

答案 1 :(得分:2)

好的,终于想通了。看起来你需要在颜色分配上设置字母字节:

paint.setColor(0x80FF0000); 

不是

paint.setColor(0xFF0000);

显然,通过排除字母字节,您隐式传入零,这意味着颜色是完全透明的。 Java AWT不是这样工作的 - 谁认为这是个好主意?!