代码如下:
java代码:
package com.dev;import android.app.Activity;
import android.app.ListActivity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.os.Bundle;
import android.util.AttributeSet;
import android.view.View;public class CviewActivity extends ListActivity {
/** Called when the activity is first created. */
private MyView myView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
myView=(MyView)findViewById(R.id.myView);
}
class MyView extends View { public MyView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
} public MyView(Context context) {
super(context);
// TODO Auto-generated constructor stub
} public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
} @Override
protected void onDraw(Canvas canvas) {
Paint mPaint=new Paint();
canvas.drawLine(10,10,500,500, mPaint);
super.onDraw(canvas);
}
}
}main.xml代码如下:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<view
class="com.dev.CviewActivity$MyView"
android:id="@+id/myView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="10"
/>
</LinearLayout>
一行一行代码查找,没有错,查了好多资料,也都是这样写的,不知错在那里?
java代码:
package com.dev;import android.app.Activity;
import android.app.ListActivity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.os.Bundle;
import android.util.AttributeSet;
import android.view.View;public class CviewActivity extends ListActivity {
/** Called when the activity is first created. */
private MyView myView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
myView=(MyView)findViewById(R.id.myView);
}
class MyView extends View { public MyView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
} public MyView(Context context) {
super(context);
// TODO Auto-generated constructor stub
} public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
} @Override
protected void onDraw(Canvas canvas) {
Paint mPaint=new Paint();
canvas.drawLine(10,10,500,500, mPaint);
super.onDraw(canvas);
}
}
}main.xml代码如下:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<view
class="com.dev.CviewActivity$MyView"
android:id="@+id/myView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="10"
/>
</LinearLayout>
一行一行代码查找,没有错,查了好多资料,也都是这样写的,不知错在那里?
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把ListActivity 改为Activity或者在main.xml中添加<ListView></ListView>节点都可以
public class CviewActivity extends ListActivity
继承ListActivity是出错之后,我试了下ListActivity看能不能用而没改过来的,
你说的两种方法我都试了,最后都报错……
class="com.dev.MyView"
android:id="@+id/myView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="10"
/>
</LinearLayout>
这样试试吧
在MyView前面加个static试试.
楼主提问题也太吝啬了.错误信息也不贴出来.我只能猜了.
在MyView前面加static,不报错,但什么也画不出来了……
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.dev/com.dev.CviewActivity}:……Caused by:android.view.InflateException:Binary XML file line #13:Error inflating class com.dev.CviewActivity……Caused by:java.lang.NoSuchMethodException:MyView(Context,AttributeSet)
<com.dev.myView .../>
这样用试一试;没用过 ListActivity,不清楚是否与此有关