The specified child already has a parent. You must call removeView() on the child's parent first.问解决

最新推荐文章于 2022-02-23 09:10:24 发布

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在学习Android Fragments时遇到一个运行时错误：The specified child already has a parent. 解决方案是，不要在inflate时为Fragment指定container，改为使用inflater.inflate(R.layout.fragment2, null)来避免给它指定父控件。" 116418084,10295491,Oracle密码重用限制参数详解,"['数据库管理', 'Oracle配置', '数据库安全']

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今天学习android fragments时，遇到一个运行时错误

The specified child already has a parent. You must call removeView() on the child's parent first.

源码如下：MainActivity.java 目的是根据屏幕尺寸的变化加载不同的fragment


public class MainActivity extends Activity {

	@SuppressWarnings("deprecation")
	@SuppressLint("NewApi")
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		Display display = getWindowManager().getDefaultDisplay();
		DisplayMetrics outMetrics = new DisplayMetrics();
		display.getRealMetrics(outMetrics);
		if(outMetrics.widthPixels > outMetrics.heightPixels){
			Fragment1 fragment1 = new Fragment1();
			
			getFragmentManager().beginTransaction().replace(R.id.main_layout, fragment1).commit();
		}else{
			Fragment2 fragment2 = new Fragment2();
			getFragmentManager().beginTransaction().replace(R.id.main_layout, fragment2).commit();
		}
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.activity_main, menu);
		return true;
	}

}

Fragment1.java

@SuppressLint("NewApi")
public class Fragment1 extends Fragment {

	@Override
	public void onActivityCreated(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onActivityCreated(savedInstanceState);
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		return inflater.inflate(R.layout.fragment1, container);
	}

}

Fragment2.java

@SuppressLint("NewApi")
public class Fragment2 extends Fragment {

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		return inflater.inflate(R.layout.fragment2, container);
	}

}

问题的原因在于Fragment在inflate的时候指定了container，在将其嵌套到其他的activity中的时候就报此错误，所以应将
inflater.inflate(R.layout.fragment2, container);
改为
return inflater.inflate(R.layout.fragment2, null);不能给它指定父控件，问题解决

</pre><pre name="code" class="java">