標籤:
方法inflate(int resource, ViewGroup root, boolean attachToRoot) 中
第一個參數傳入布局的資源ID,產生fragment視圖,第二個參數是視圖的父視圖,通常我們需要父
視圖來正確配置組件。第三個參數告知布局產生器是否將產生的視圖添加給父視圖。
我們建立一個項目測試一下:
activity_main.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="helloworld" /> <FrameLayout android:id="@+id/framelayout" android:layout_width="match_parent" android:layout_height="wrap_content"> </FrameLayout> </LinearLayout>
fragment_main.xml:
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Button" /> </LinearLayout>
MainActivity.java:第一種情況沒有attachToRoot參數,預設告知布局產生器將產生的視圖添加給父視圖,
1 public class MainActivity extends Activity { 2 3 @Override 4 protected void onCreate(Bundle savedInstanceState) { 5 super.onCreate(savedInstanceState); 6 setContentView(R.layout.activity_main); 7 ViewGroup vg = (ViewGroup) findViewById(R.id.framelayout); 8 View v = LayoutInflater.from(this).inflate(R.layout.fragment_main, vg); 9 // View v = LayoutInflater.from(this).inflate(R.layout.fragment_main, vg, false);10 // View v = LayoutInflater.from(this).inflate(R.layout.fragment_main, vg, true);11 12 13 }14 15 16 }
第二種情況:參數attachToRoot設為false,不將產生的視圖(fragmnt_main)添加給父視圖(activity_main),
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ViewGroup vg = (ViewGroup) findViewById(R.id.framelayout);
// View v = LayoutInflater.from(this).inflate(R.layout.fragment_main, vg);
View v = LayoutInflater.from(this).inflate(R.layout.fragment_main, vg, false);
// View v = LayoutInflater.from(this).inflate(R.layout.fragment_main, vg, true);
}
}
第三種情況:參數attachToRoot設為true,將產生的視圖(fragmnt_main)添加給父視圖(activity_main),
public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ViewGroup vg = (ViewGroup) findViewById(R.id.framelayout);// View v = LayoutInflater.from(this).inflate(R.layout.fragment_main, vg);// View v = LayoutInflater.from(this).inflate(R.layout.fragment_main, vg, false); View v = LayoutInflater.from(this).inflate(R.layout.fragment_main, vg, true); }}
Android LayoutInflater.inflate(int resource, ViewGroup root, boolean attachToRoot)的參數理解