通過設定能見度(visibility)實現隱藏視圖

通過設定能見度android:visibility, 可控制視圖的能見度.

visible: 可見(默認值).
invisible: 不可見, 但仍佔用空間.
gone: 完全不可見, 不佔用空間.





main.xml

<?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"
  />
<Spinner
  android:id="@+id/hidenoption"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  />
<LinearLayout
android:id="@+id/hidenlayout"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  >
<TextView
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="可被隱藏"
  />
<Button
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text=" test "
  />
<EditText
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  />
</LinearLayout>
<TextView
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="正常顯示：不會被隱藏"
  />
</LinearLayout>

主代碼, AndroidHidenMenu.java

package com.AndroidHidenMenu;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.Spinner;

public class AndroidHidenMenu extends Activity {

private static final String[] visibility = {"VISIBLE", "INVISIBLE", "GONE"};
private static final int[] visibilitySetting ={ View.VISIBLE, View.INVISIBLE, View.GONE};

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
      Spinner hidenOption = (Spinner)findViewById(R.id.hidenoption);
      ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
        android.R.layout.simple_spinner_item, visibility);
      adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
      hidenOption.setAdapter(adapter);
    
      final LinearLayout hidenLayout = (LinearLayout)findViewById(R.id.hidenlayout);
    
      hidenOption.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){

 @Override
 public void onItemSelected(AdapterView<?> arg0, View arg1,
   int arg2, long arg3) {
  // TODO Auto-generated method stub
  hidenLayout.setVisibility(visibilitySetting[arg2]);

 }

 @Override
 public void onNothingSelected(AdapterView<?> arg0) {
  // TODO Auto-generated method stub

 }});
  }
}