Demonstrates the seeking capability of ValueAnimator. : Animation « Animation « Android

1. Android
2. Animation
3. Animation

Demonstrates the seeking capability of ValueAnimator.

    
/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.apis.animation;

// Need the following import to get access to the app resources, since this
// class is in a sub-package.
import android.animation.AnimatorListenerAdapter;
import android.animation.Animator;
import android.animation.ObjectAnimator;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.Interpolator;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import com.example.android.apis.R;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.SeekBar;

/**
 * This application demonstrates the seeking capability of ValueAnimator. The SeekBar in the
 * UI allows you to set the position of the animation. Pressing the Run button will play from
 * the current position of the animation.
 */
public class ListFlipper extends Activity {

    private static final int DURATION = 1500;
    private SeekBar mSeekBar;

    private static final String[] LIST_STRINGS_EN = new String[] {
            "One",
            "Two",
            "Three",
            "Four",
            "Five",
            "Six"
    };
    private static final String[] LIST_STRINGS_FR = new String[] {
            "Un",
            "Deux",
            "Trois",
            "Quatre",
            "Le Five",
            "Six"
    };

    ListView mEnglishList;
    ListView mFrenchList;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //FrameLayout container = (LinearLayout) findViewById(R.id.container);
        mEnglishList = (ListView) findViewById(R.id.list_en);
        mFrenchList = (ListView) findViewById(R.id.list_fr);

        // Prepare the ListView
        final ArrayAdapter<String> adapterEn = new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, LIST_STRINGS_EN);
        // Prepare the ListView
        final ArrayAdapter<String> adapterFr = new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, LIST_STRINGS_FR);

        mEnglishList.setAdapter(adapterEn);
        mFrenchList.setAdapter(adapterFr);
        mFrenchList.setRotationY(-90f);

        Button starter = (Button) findViewById(R.id.button);
        starter.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                flipit();
            }
        });
    }

    private Interpolator accelerator = new AccelerateInterpolator();
    private Interpolator decelerator = new DecelerateInterpolator();
    private void flipit() {
        final ListView visibleList;
        final ListView invisibleList;
        if (mEnglishList.getVisibility() == View.GONE) {
            visibleList = mFrenchList;
            invisibleList = mEnglishList;
        } else {
            invisibleList = mFrenchList;
            visibleList = mEnglishList;
        }
        ObjectAnimator visToInvis = ObjectAnimator.ofFloat(visibleList, "rotationY", 0f, 90f);
        visToInvis.setDuration(500);
        visToInvis.setInterpolator(accelerator);
        final ObjectAnimator invisToVis = ObjectAnimator.ofFloat(invisibleList, "rotationY",
                -90f, 0f);
        invisToVis.setDuration(500);
        invisToVis.setInterpolator(decelerator);
        visToInvis.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator anim) {
                visibleList.setVisibility(View.GONE);
                invisToVis.start();
                invisibleList.setVisibility(View.VISIBLE);
            }
        });
        visToInvis.start();
    }


}

//main.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2010 The Android Open Source Project

     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at

          http://www.apache.org/licenses/LICENSE-2.0

     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
-->

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <Button
        android:id="@+id/button"
        android:text="Flip"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <ListView
        android:id="@+id/list_en"
        android:layout_width="match_parent"
        android:layout_weight="1.0"
        android:layout_height="0dip"/>
    <ListView
        android:id="@+id/list_fr"
        android:layout_width="match_parent"
        android:layout_weight="1.0"
        android:layout_height="0dip"
        android:visibility="gone"/>
</LinearLayout>

   
    
    
    
  

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