Android中SlidingDrawer利用透明动画提示效果，终于有人把Android程序员必学知识点全整理出来了

android:textSize=“26sp”

android:text=“抽屉的内容”/>

<Button

android:layout_width=“match_parent”

android:layout_height=“wrap_content”

android:text=“我是打酱油的”

android:background="#ff00ff"

/>

Activity中的实现效果的代码：（透明动画）

Activity代码如下：

public class MyDemo extends AppCompatActivit

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y {

private ImageView demo_lv_up1;

private ImageView demo_lv_up2;

private LinearLayout demo_ll_handle;

private RelativeLayout demo_ll_content;

private SlidingDrawer demo_sd;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_my_demo);

initView();

//动画的实现

initAnimation();

//抽屉的点击事件

setOnDrawerListener();

}

private void initView() {

demo_lv_up1 = (ImageView) findViewById(R.id.demo_lv_up1);

demo_lv_up2 = (ImageView) findViewById(R.id.demo_lv_up2);

demo_ll_handle = (LinearLayout) findViewById(R.id.demo_ll_handle);

demo_ll_content = (RelativeLayout) findViewById(R.id.demo_ll_content);

demo_sd = (SlidingDrawer) findViewById(R.id.demo_sd);

}

//动画的实现

private void initAnimation() {

demo_lv_up1.setImageResource(R.mipmap.drawer_arrow_up);

demo_lv_up2.setImageResource(R.mipmap.drawer_arrow_up);

//半透明-不透明

AlphaAnimation animation = new AlphaAnimation(0.2f, 1.0f);

animation.setDuration(500);

animation.setRepeatCount(Animation.INFINITE);

animation.setRepeatMode(Animation.REVERSE);

demo_lv_up1.startAnimation(animation);

//不透明-半透明

AlphaAnimation animation1 = new AlphaAnimation(1.0f, 0.2f);

animation1.setDuration(500);

animation1.setRepeatCount(Animation.INFINITE);

animation1.setRepeatMode(Animation.REVERSE);

demo_lv_up2.startAnimation(animation1);

}

//抽屉的点击事件

private void setOnDrawerListener() {

//打开抽屉

demo_sd.setOnDrawerOpenListener(new SlidingDrawer.OnDrawerOpenListener() {

@Override

public void onDrawerOpened() {

//关闭动画，改变箭头方向

closeAnimation();

}

});

demo_sd.setOnDrawerCloseListener(new SlidingDrawer.OnDrawerCloseListener() {

@Override

public void onDrawerClosed() {

//改变箭头方向,开启动画

initAnimation();

}

});

}

//关闭动画且改变箭头方向

private void closeAnimation() {

demo_lv_up1.clearAnimation();

demo_lv_up2.clearAnimation();

//改变箭头方向

demo_lv_up1.setImageResource(R.mipmap.drawer_arrow_down);