MainActivity.java

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/*
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 * Copyright 2013 The Android Open Source Project
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *       http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.example.android.textswitcher;
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import android.app.Activity;
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import android.os.Bundle;
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import android.view.Gravity;
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import android.view.View;
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import android.view.animation.Animation;
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import android.view.animation.AnimationUtils;
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import android.widget.Button;
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import android.widget.TextSwitcher;
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import android.widget.TextView;
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import android.widget.ViewSwitcher.ViewFactory;
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/**
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 * This sample shows the use of the {@link android.widget.TextSwitcher} View with animations. A
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 * {@link android.widget.TextSwitcher} is a special type of {@link android.widget.ViewSwitcher} that animates
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 * the current text out and new text in when
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 * {@link android.widget.TextSwitcher#setText(CharSequence)} is called.
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 */
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public class MainActivity extends Activity {
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    private TextSwitcher mSwitcher;
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    private int mCounter = 0;
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    @Override
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    protected void onCreate(Bundle savedInstanceState) {
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        super.onCreate(savedInstanceState);
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        setContentView(R.layout.sample_main);
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        // Get the TextSwitcher view from the layout
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        mSwitcher = (TextSwitcher) findViewById(R.id.switcher);
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        // Set the factory used to create TextViews to switch between.
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        mSwitcher.setFactory(mFactory);
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        /*
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         * Set the in and out animations. Using the fade_in/out animations
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         * provided by the framework.
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         */
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        Animation in = AnimationUtils.loadAnimation(this,
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                android.R.anim.fade_in);
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        Animation out = AnimationUtils.loadAnimation(this,
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                android.R.anim.fade_out);
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        mSwitcher.setInAnimation(in);
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        mSwitcher.setOutAnimation(out);
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        /*
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         * Setup the 'next' button. The counter is incremented when clicked and
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         * the new value is displayed in the TextSwitcher. The change of text is
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         * automatically animated using the in/out animations set above.
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         */
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        Button nextButton = (Button) findViewById(R.id.button);
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        nextButton.setOnClickListener(new View.OnClickListener() {
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            @Override
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            public void onClick(View v) {
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                mCounter++;
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                mSwitcher.setText(String.valueOf(mCounter));
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            }
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        });
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        // Set the initial text without an animation
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        mSwitcher.setCurrentText(String.valueOf(mCounter));
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    }
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    /**
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     * The {@link android.widget.ViewSwitcher.ViewFactory} used to create {@link android.widget.TextView}s that the
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     * {@link android.widget.TextSwitcher} will switch between.
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     */
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    private ViewFactory mFactory = new ViewFactory() {
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        @Override
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        public View makeView() {
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            // Create a new TextView
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            TextView t = new TextView(MainActivity.this);
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            t.setGravity(Gravity.TOP | Gravity.CENTER_HORIZONTAL);
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            t.setTextAppearance(MainActivity.this, android.R.style.TextAppearance_Large);
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            return t;
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        }
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    };
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}