Android TransitionDrawable ImageView過分效果使用實例

實現兩張圖片漸隱漸現的過渡效果Transition Drawable實現兩張圖片之間動態過分效果的方式。

執行例如如下所看到的：第一張爲初始界面。第二張爲過分中界面，第三張爲過渡結束

       

新建一個TransitionDrawable的Androidproject。

文件夾結構：

主界面activity_main.xml代碼例如如下：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <Button 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/button_text"
        android:layout_centerInParent="true"
        android:onClick="change"
        android:background="@drawable/transition"
        android:layout_marginBottom="20dp"/>
</RelativeLayout>

主界面主要是一個應用了TransitionDrawable的button
transition是在drawalbe目錄下，其代碼例如如下所看到的：

<?xml version="1.0" encoding="utf-8"?
>
<transition xmlns:android="http://schemas.android.com/apk/res/android">
	<item android:drawable="@color/red"></item>
	<item android:drawable="@color/green"></item>
</transition>

strings.xml代碼例如如下：

 <string name="app_name">TransitionDrawable</string>
    <string name="hello_world">Hello world!</string>
    <string name="action_settings">Settings</string>
    <string name="button_text">過渡效果</string>

colors.xml代碼例如如下：

<?
xml version="1.0" encoding="utf-8"?>
<resources>
  <color name="red">#ff0000</color>
  <color name="green">#00ff00</color>  
</resources>

MainActivity.java代碼例如如下

package com.shen.transitiondrawable;

import android.app.Activity;
import android.graphics.drawable.TransitionDrawable;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {

	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// Handle action bar item clicks here. The action bar will
		// automatically handle clicks on the Home/Up button, so long
		// as you specify a parent activity in AndroidManifest.xml.
		int id = item.getItemId();
		if (id == R.id.action_settings) {
			return true;
		}
		return super.onOptionsItemSelected(item);
	}
	
	public void change(View v)
	{
		TransitionDrawable drawable = (TransitionDrawable)((Button)v).getBackground();
		drawable.startTransition(2000);
	}
}

源代碼下載

擴展閱讀：

http://www.tuicool.com/articles/uiaYBrU

http://adk.tumblr.com/post/13069401302/outofmemoryerror-imageview-and-transitiondrawable