问题描述

Android surfaceview控件高度超过8192就不回调surfaceCreated( )函数

一、问题：

自己自定义了一个surfaceview，在onMeasurea方法中设置该控件的高度，发现一旦超过8192就不会回调surfaceCreated( )函数，是什么原因造成的?一直想不通为什么会不回调...有这个限制吗？

二、测试的例子：

这里把surfaceview放到scrollview中，可以上下滑动查看。（把scrollview去掉也出现同样的问题）

当高度大于8192时，查看log打印的信息，发现没有调用surfaceCreated( )。

**1、自定义的TestSurfaceView.java**

package com.hebei.textviewdemo6;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class TestSurfaceView extends SurfaceView implements SurfaceHolder.Callback{

    public TestSurfaceView(Context context, AttributeSet attrs) {
        super(context, attrs);
        // TODO Auto-generated constructor stub
        SurfaceHolder holder = getHolder();
        holder.addCallback(this);
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        // TODO Auto-generated method stub
        Log.d("surfaceCreated", "created");
        Log.d("surfaceCreated", "widht = "+this.getWidth()+" height = "+this.getHeight());
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        // TODO Auto-generated method stub
        Log.d("surfaceChanged", "changed");
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        // TODO Auto-generated method stub
        Log.d("surfaceDestoryed", "destoryed");
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        int width = MeasureSpec.getSize(widthMeasureSpec);
        int height = 8193;
        Log.d("onMeasure", "Width = "+width+" Height = "+height);

        setMeasuredDimension(width, height);
    }
}

**2、xml文件**

<RelativeLayout 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"
    tools:context="com.hebei.textviewdemo6.MainActivity" >

    <ScrollView
        android:id="@+id/scrollview_demo6"
        android:layout_width="120dp"
        android:layout_height="120dp"
        android:background="#FF0000"
        android:fadingEdge="vertical"
        android:scrollbars="vertical" >

        <com.hebei.textviewdemo6.TestSurfaceView
             android:layout_width="match_parent"
            android:layout_height="wrap_content" />
    </ScrollView>

</RelativeLayout>

**3、MainActivity.java**

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.d("onCreate", "create");
    }

}