Android 中组件的显示与隐藏

组件的显示与隐藏

1.Activity.java

package com.text;

 

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

 

public class HhActivity extends Activity {

    /** Called when the activity is first created. */

    Button but1 = null;

    Button but2 = null;

    TextView text1 = null;

    EditText edit1 = null;

 

    @Override

    public void onCreate(Bundle savedInstanceState) {

       super.onCreate(savedInstanceState);

       setContentView(R.layout.main);

       but1 = (Button) findViewById(R.id.but1);

       but2 = (Button) findViewById(R.id.but2);

       text1 = (TextView) findViewById(R.id.text1);

       edit1 = (EditText) findViewById(R.id.edit1);

       but1.setOnClickListener(new OnClickListener() {

 

           @Override

           public void onClick(View v) {

              // TODO Auto-generated method stub

              but1.setVisibility(View.GONE);

              but2.setVisibility(View.VISIBLE);

              text1.setVisibility(View.VISIBLE);

              edit1.setVisibility(View.VISIBLE);

           }

       });

       but2.setOnClickListener(new OnClickListener() {

 

           @Override

           public void onClick(View v) {

              // TODO Auto-generated method stub

              but1.setVisibility(View.VISIBLE);

              but2.setVisibility(View.GONE);

              text1.setVisibility(View.GONE);

              edit1.setVisibility(View.GONE);

           }

       });

    }

}

 

 

2.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"

    />

<Button android:id="@+id/but1" android:layout_width="wrap_content"

    android:layout_height="wrap_content" android:text="but1"/>

<TextView  android:id="@+id/text1"  android:layout_width="wrap_content"

    android:layout_height="wrap_content" android:visibility="gone" android:text="text1"/>

<EditText android:id="@+id/edit1"  android:layout_width="wrap_content"

    android:layout_height="wrap_content" android:visibility="gone"/>

<Button android:id="@+id/but2" android:layout_width="wrap_content"

    android:layout_height="wrap_content" android:visibility="gone" android:text="but2"/>

</LinearLayout>

 

 

 

//代码解析

SetVisibility(int visibility)为View设置可行的状态，visibility参数为三者其中一个VISIBLE,INVISIBLE,GONE

VISIBLE:可见的，值0

INVISIBLE:不可见，但占据一定空间布局，值4

GONE:不可见，不占据任何空间布局，值8

相关的XML属性：android:visibility