想在LinearLayout下嵌套一个Framelayout,xml文件如下：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<FrameLayout
android:id="@+id/layout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</FrameLayout>
</LinearLayout>
程序代码：
package com.circle.test;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.FrameLayout.LayoutParams;
import android.widget.ListView;
public class Test_CircleActivity extends Activity {
private Button btn;
private FrameLayout layout;
private FrameLayout.LayoutParams params1;
private ListView lv;
private String items[] = {"a","b","c","d","e","f","g","h","i"};
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn = (Button)findViewById(R.id.button1);
layout = (FrameLayout)findViewById(R.id.layout);
params1 = new FrameLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
MyView view1 = new MyView(this);
layout.addView(view1, params1);
lv = (ListView)findViewById(R.id.listView1);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1, items);
lv.setAdapter(adapter);
}
public class MyView extends View{
public MyView(Context context) {
super(context);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Paint paint = new Paint();
paint.setColor(Color.RED);
paint.setStyle(Style.STROKE);
canvas.drawCircle(200, 200, 10, paint);
canvas.drawCircle(100, 200, 10, paint);
canvas.drawCircle(220, 200, 10, paint);
}
}
}
程序运行报错：ava.lang.RuntimeException: Unable to start activity ComponentInfo{com.circle.test/com.circle.test.Test_CircleActivity}: java.lang.ClassCastException: android.widget.FrameLayout
求助高人帮我看下，哪里出错了？
------解决方案--------------------
模拟器上试了一下没问题，能出来list和三个红圈。你再查查你的xml等配置文件