我是 Android 新手,我正在尝试在 xml 中扩展布局,但我得到了一个 RuntimeException。除了我的活动类和扩展 SurfaceView 的类之外,我几乎删除了所有内容。谁能告诉我我做错了什么?
主.xml:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.hj.Panel
android:id="@+id/SurfaceView01"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</FrameLayout>
丽塔.java:
package com.hj;
import android.app.Activity;
import android.os.Bundle;
public class Rita extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
面板.java:
package com.hj;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.SurfaceView;
class Panel extends SurfaceView {
private Paint mPaint;
public Panel(Context context) {
super(context);
}
@Override
public void onDraw(Canvas canvas) {
mPaint = new Paint();
canvas.drawRect(0, 0, 322, 644, mPaint);
}
}