如何使用三种布局的视图鳍状肢？

Question

我目前正在使用ViewFlipper两种不同的布局进行主要活动.我想使用第三种布局,但我只能找到showNext()和showPrevious()命令.有人可以告诉我如何使用ViewFlipper？实现第三个布局？

Answer 1

为您举例说明如何在ViewFlipper中显示不同的视图.

该示例的布局由以下部分组成.有三个单选按钮.ViewFlipper位于单选按钮下方.这个鳍状肢拥有三种不同的简单视图和不同的文本.

然后,单选按钮将连接到java代码中的侦听器,该代码将根据当前选择的单选按钮更改ViewFlipper显示的视图.

XML

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout android:id="@+id/LinearLayout01"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical">

    <RadioGroup android:id="@+id/radioGroup1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
        <RadioButton android:layout_height="wrap_content"
            android:id="@+id/radio0" android:layout_width="wrap_content"
            android:text="Show View 1" android:checked="true"></RadioButton>
        <RadioButton android:layout_height="wrap_content"
            android:id="@+id/radio1" android:layout_width="wrap_content"
            android:text="Show view 2"></RadioButton>
        <RadioButton android:layout_height="wrap_content"
            android:id="@+id/radio2" android:layout_width="wrap_content"
            android:text="Show View 3"></RadioButton>
    </RadioGroup>

    <ViewFlipper android:id="@+id/ViewFlipper01"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
        <!--adding views to ViewFlipper-->
        <TextView android:id="@+id/TextView01"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="First view is now displayed"></TextView>
        <TextView android:id="@+id/TextView02"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Second view is now displayed"></TextView>
        <TextView android:id="@+id/TextView03"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Third view is now displayed"></TextView>
    </ViewFlipper>

</LinearLayout>

JAVA

package com.test.threeviews;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.RadioButton;
import android.widget.ViewFlipper;

public class ThreeViewsinaFlipperActivity extends Activity {

    RadioButton RB0;
    RadioButton RB1;
    RadioButton RB2;
    ViewFlipper VF;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        /*
         * Find the views declared in main.xml.
         */
        RB0 = (RadioButton) findViewById(R.id.radio0);
        RB1 = (RadioButton) findViewById(R.id.radio1);
        RB2 = (RadioButton) findViewById(R.id.radio2);
        VF = (ViewFlipper) findViewById(R.id.ViewFlipper01);

        /*
         * Set a listener that will listen for clicks on the radio buttons and
         * perform suitable actions.
         */
        RB0.setOnClickListener(radio_listener);
        RB1.setOnClickListener(radio_listener);
        RB2.setOnClickListener(radio_listener);
    }

    /*
     * Define a OnClickListener that will change which view that is displayed by
     * the ViewFlipper
     */
    private OnClickListener radio_listener = new OnClickListener() {
        public void onClick(View v) {
            switch (v.getId()) {
            case R.id.radio0:
                VF.setDisplayedChild(0);
                break;
            case R.id.radio1:
                VF.setDisplayedChild(1);
                break;
            case R.id.radio2:
                VF.setDisplayedChild(2);
                break;
            }
        }
    };
}

Answer 2

看到android.widget.ViewFlipper的这个简单用法.有了它,您可以从xml创建不同的布局,然后使用这样的简单方法在它们之间切换:

   ViewFlipper viewFlipper = (ViewFlipper) findViewById(R.id.myViewFlipper);

   // you can switch between next and previous layout and display it
   viewFlipper.showNext();
   viewFlipper.showPrevious();

  // or you can switch selecting the layout that you want to display
  viewFlipper.setDisplayedChild(1);
  viewFlipper.setDisplayedChild(viewFlipper.indexOfChild(findViewById(R.id.secondLayout)

树布局的Xml示例:

     <ViewFlipper
            android:id="@+id/myViewFlipper"
            android:layout_width="match_parent"
            android:layout_height="match_parent" >

            <LinearLayout
                android:id="@+id/firstLayout"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical" >
               [...]
            </LinearLayout>

            <LinearLayout
                android:id="@+id/secondLayout"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical" >
               [...]
            </LinearLayout>

            <LinearLayout
                android:id="@+id/thirdLayout"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical" >
              [...]
            </LinearLayout>
      </ViewFlipper>