最近工作比较轻松,没有什么事情干,于是进入高产模式(呃。。。。高产似xx)。
应该很多童鞋对自定义view这个东西比较抵触,可能是听网上说view比较难吧,其实自定义view并没有很难
自定义view分为三种
1.自绘view
2.组合控件view
3.重写系统view
今天我们就来以一个小例子讲一下自定义view中的组合控件view,所谓的组合控件view就是使用系统预设的view来进行组合成一个新的view。并不进行图形的绘制操作。好了,今天的目标是把之前用Animation实现的loading动画做成一个view来使用,如果你还不了解Animation动画 可以去开开这篇博客:动画介绍--Animation 实现loading动画效果
老规矩,先上效果图:
可以看到效果跟上篇博客差不多,但是现在他可是一个view。我们首先来看一下布局文件:
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <com.wingsoft.loadinganimation.LoadingView android:id="@+id/loading" android:layout_width="300dp" android:layout_centerInParent="true" android:layout_height="300dp"> </com.wingsoft.loadinganimation.LoadingView> <Button android:id="@+id/button_cancel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="cancel"/> </RelativeLayout>
由于我们今天介绍的是控件组合view,所以新建一个类让他继承于FrameLayout
public class LoadingView extends FrameLayout { private ImageView mImageView; private TextView mTextView; private AnimationSet mImageAni = new AnimationSet(true); private AnimationSet mTextAni = new AnimationSet(true); public LoadingView(Context context, AttributeSet attrs) { super(context, attrs); LayoutInflater.from(context).inflate(R.layout.loading_view,this); mImageAni = new AnimationSet(true); mTextAni = new AnimationSet(true); mImageView = (ImageView) findViewById(R.id.loadingView_point); mTextView = (TextView) findViewById(R.id.loadingView_loading); TranslateAnimation ta = new TranslateAnimation(100, 0, 200, 0); ta.setDuration(5000); RotateAnimation ra = new RotateAnimation(0, 360, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); ra.setDuration(5000); mImageAni.addAnimation(ta); mImageAni.addAnimation(ra); ScaleAnimation sa = new ScaleAnimation(0, 1, 0, 1, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); sa.setDuration(5000); AlphaAnimation aa = new AlphaAnimation(0, 1); aa.setDuration(5000); mTextAni.addAnimation(sa); mTextAni.addAnimation(aa); aa.setAnimationListener(new Animation.AnimationListener() { @Override public void onAnimationStart(Animation animation) { } @Override public void onAnimationEnd(Animation animation) { mTextView.startAnimation(mTextAni); mImageView.startAnimation(mImageAni); } @Override public void onAnimationRepeat(Animation animation) { } }); } public void start(){ mTextView.startAnimation(mTextAni); mImageView.startAnimation(mImageAni); } public void stop(){ mTextView.clearAnimation(); mImageView.clearAnimation(); } }
public class MainActivity extends ActionBarActivity { private LoadingView mLoadingView; private Button mButton; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mLoadingView = (LoadingView) findViewById(R.id.loading); mButton = (Button)findViewById(R.id.button_cancel); mLoadingView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { mLoadingView.start(); } }); mButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { mLoadingView.stop(); } }); } }
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原文地址:http://blog.csdn.net/wingichoy/article/details/47146855