利用补间动画中的一个alphaAnimation动画：
public class MainActivity extends Activity {
private ImageView ivlogin;
private Button loginBtn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ivlogin = (ImageView) findViewById(R.id.iv_login);
loginBtn = (Button) findViewById(R.id.btn_begin);
AlphaAnimation alphaAnimation = new AlphaAnimation(0.1f, 1.0f);
alphaAnimation.setDuration(3000);
alphaAnimation.setFillAfter(true);
ivlogin.startAnimation(alphaAnimation);
loginBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,HomeActivity.class);
startActivity(intent);
MainActivity.this.finish();
}
});
}
}
布局很简单，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"
tools:context=".MainActivity" >
<ImageView
android:id="@+id/iv_login"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerVertical="true"
android:scaleType="fitXY"
android:src="@drawable/launch" />
<Button
android:id="@+id/btn_begin"
android:layout_width="wrap_content"
android:layout_height="46dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="30dp"
android:background="@drawable/afs"
android:text="@string/login_btn_begin" >
</Button>
</RelativeLayout>
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