更新时间:2022-08-21 21:04:56
基于谷歌官方DrawerLayout实现QQ样式边侧滑抽屉缩进缩出技术
在附录文章1中,已经在基于第三方的SlidingMenu实现了边侧滑抽屉缩进缩出的效果,接下来,本文针对Google官方边侧滑抽屉技术DrawerLayout,改造DrawerLayout,以实现QQ样式的边侧滑抽屉缩进缩出效果。
关于DrawerLayout的具体实现,在附录文章2中有介绍。
首先写一个DrawerLayout的布局:
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/ic_launcher" >
<FrameLayout
android:id="@+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:background="#F44336"
android:gravity="center"
android:text="Zhang Phil"
android:textSize="50sp" />
</FrameLayout>
<RelativeLayout
android:layout_width="200dip"
android:layout_height="match_parent"
android:layout_gravity="left" >
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="20dip"
android:layout_marginRight="20dip"
android:layout_marginTop="20dip"
android:background="#42a5f5"
android:gravity="center"
android:text="左" />
</RelativeLayout>
</android.support.v4.widget.DrawerLayout>
MainActivity.java,注意MainActivity里面的核心关键处代码:
package zhangphil.drawerlayout;
import com.nineoldandroids.view.ViewHelper;
import android.app.Activity;
import android.graphics.Color;
import android.graphics.PorterDuff.Mode;
import android.os.Bundle;
import android.support.v4.widget.DrawerLayout;
import android.support.v4.widget.DrawerLayout.DrawerListener;
import android.view.View;
import android.view.Window;
public class MainActivity extends Activity {
private DrawerLayout mDrawerLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
// 故意设置透明,否则在滑动侧滑时候Android的DrawerLayout会在窗口默认显示渐变的灰黑过渡色。
// 此处屏蔽Android系统提供的默认渐变过渡灰黑
mDrawerLayout.setScrimColor(Color.TRANSPARENT);
// mDrawerLayout.setDrawerLockMode(Gravity.LEFT);
mDrawerLayout.addDrawerListener(new DrawerListener() {
@Override
public void onDrawerClosed(View v) {
}
@Override
public void onDrawerOpened(View v) {
}
@Override
public void onDrawerSlide(View drawerView, float slideOffset) {
// 主体窗口
View mainFrame = mDrawerLayout.getChildAt(0);
// 这个就是隐藏起来的边侧滑菜单栏
View leftMenu = drawerView;
addQQStyleSlide(mainFrame, leftMenu, slideOffset);
}
@Override
public void onDrawerStateChanged(int arg0) {
}
});
}
// 实现的核心代码
private void addQQStyleSlide(View mainFrame, View leftMenu, float slideOffset) {
float leftScale = 0.5f + 0.5f * slideOffset;
float rightScale = 1 - 0.2f * slideOffset;
ViewHelper.setScaleX(leftMenu, leftScale);
ViewHelper.setScaleY(leftMenu, leftScale);
ViewHelper.setAlpha(leftMenu, 0.5f + 0.5f * slideOffset);
ViewHelper.setTranslationX(mainFrame, leftMenu.getMeasuredWidth() * slideOffset);
ViewHelper.setPivotX(mainFrame, 0);
ViewHelper.setPivotY(mainFrame, mainFrame.getMeasuredHeight() / 2);
mainFrame.invalidate();
ViewHelper.setScaleX(mainFrame, rightScale);
ViewHelper.setScaleY(mainFrame, rightScale);
// 该处主要是为了使背景的颜色渐变过渡。
getWindow().getDecorView().getBackground().setColorFilter(evaluate(slideOffset, Color.BLACK, Color.TRANSPARENT),
Mode.SRC_OVER);
}
private Integer evaluate(float fraction, Object startValue, Integer endValue) {
int startInt = (Integer) startValue;
int startA = (startInt >> 24) & 0xff;
int startR = (startInt >> 16) & 0xff;
int startG = (startInt >> 8) & 0xff;
int startB = startInt & 0xff;
int endInt = (Integer) endValue;
int endA = (endInt >> 24) & 0xff;
int endR = (endInt >> 16) & 0xff;
int endG = (endInt >> 8) & 0xff;
int endB = endInt & 0xff;
return (int) ((startA + (int) (fraction * (endA - startA))) << 24)
| (int) ((startR + (int) (fraction * (endR - startR))) << 16)
| (int) ((startG + (int) (fraction * (endG - startG))) << 8)
| (int) ((startB + (int) (fraction * (endB - startB))));
}
}
代码运行效果(初始化 -> 从左往右逐渐抽屉打开时候的缩进与缩出):
初始化、静止状态
开始边侧滑,从左边逐渐打开抽屉
边侧滑结束,抽屉完全打开,此时已经静止
附录文章:
1,《改进Android SlidingMenu实现QQ样式边侧滑抽屉技术》链接地址:http://blog.csdn.net/zhangphil/article/details/51044699
2,《基于Android官方DrawerLayout实现抽屉导航菜单》链接地址:http://blog.csdn.net/zhangphil/article/details/48710453