DrawerLayout实现网易新闻抽屉效果

个人感觉网易的客户端比较前卫,有很多新鲜的东西,有时候模仿这些好的客户端能学到很多东西

开始今天的主要课题,下面是网易客户端抽屉模式实现的效果

其实有个Drawerlayout这个布局,你得问题就已经解决掉一大半了,Drawerlayout布局本身就提供了左划和右划的功能

先上代码,然后慢慢解答,看完这篇博客你就知道Drawerlayout怎么用了

首先上逐步局文件代码

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/drawerlayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    <FrameLayout
        android:id="@+id/fragment_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </FrameLayout>
    <RelativeLayout
        android:id="@+id/left"
        android:layout_width="200dp"
        android:layout_height="match_parent"
        android:layout_gravity="left"
        android:background="@android:color/white">
        <ListView
            android:id="@+id/left_listview"
            android:layout_width="match_parent"
            android:layout_height="match_parent" >
        </ListView>
    </RelativeLayout>
    <RelativeLayout
        android:id="@+id/right"
        android:layout_width="260dp"
        android:layout_height="match_parent"
        android:layout_gravity="right"
        android:background="@android:color/holo_green_light">
        <TextView
            android:id="@+id/right_textview"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="个人登陆页面" />
    </RelativeLayout>
</android.support.v4.widget.DrawerLayout>

Drawerlayout是Androidv4包里自带的,既然是自带的那么直接拿来用就可以了,当然前提是你得工程里有v4包

下面解释上面的布局文件,让你懂得Drawerlayout用法,首先Drawerlayout支持左划和右划,那他是如何控制的呢?不居中告诉你,以上布局分为三部分,一般情况下,第一部分是主步局,第二部分是左划的布局,第三部分是右划的布局,其实这里的左向滑动和右向滑动是通过gravity控制,左划界面android:layout_gravity="left" 当然这里的left也可以用start代替,右划界面就理所当然的是android:layout_gravity="right" ,同样right也可以用end代替,其余的应该明白了吧!不懂留言,我认真为你解答

下面在贴一下主界面的代码,你看懂Drawerlayout用法其余的就很简单了,妈妈再也不懂担心你的学习了

package com.sdufe.thea.guo;
import java.util.ArrayList;
import java.util.List;
import com.sdufe.thea.guo.adapter.ContentAdapter;
import com.sdufe.thea.guo.model.ContentModel;
import android.os.Bundle;
import android.app.Activity;
import android.support.v4.widget.DrawerLayout;
import android.support.v4.widget.DrawerLayout.DrawerListener;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class MainActivity extends Activity {
	private DrawerLayout drawerLayout;
	private RelativeLayout leftLayout;
	private RelativeLayout rightLayout;
	private List<ContentModel> list;
	private ContentAdapter adapter;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		drawerLayout = (DrawerLayout) findViewById(R.id.drawerlayout);
		leftLayout=(RelativeLayout) findViewById(R.id.left);
		rightLayout=(RelativeLayout) findViewById(R.id.right);
		ListView listView=(ListView) leftLayout.findViewById(R.id.left_listview);
		initData();
		adapter=new ContentAdapter(this, list);
		listView.setAdapter(adapter);
	}
	private void initData() {
		list=new ArrayList<ContentModel>();
		list.add(new ContentModel(R.drawable.doctoradvice2, "新闻"));
		list.add(new ContentModel(R.drawable.infusion_selected, "订阅"));
		list.add(new ContentModel(R.drawable.mypatient_selected, "图片"));
		list.add(new ContentModel(R.drawable.mywork_selected, "视频"));
		list.add(new ContentModel(R.drawable.nursingcareplan2, "跟帖"));
		list.add(new ContentModel(R.drawable.personal_selected, "投票"));
	}
}

ok,就是这么简单啦!

CSDN代码下载:http://download.csdn.net/detail/elinavampire/8195349

github代码下载:https://github.com/zimoguo/DrawerMode

................................................源码.....................................................................

首先看Drawerlayout,他继承自ViewGroup,这里主要看一下它里面的方法,方便以后使用

/**
     * Listener for monitoring events about drawers.
     */
    public interface DrawerListener {
        /**
         * Called when a drawer's position changes.
         * @param drawerView The child view that was moved
         * @param slideOffset The new offset of this drawer within its range, from 0-1
         */
        public void onDrawerSlide(View drawerView, float slideOffset);
        /**
         * Called when a drawer has settled in a completely open state.
         * The drawer is interactive at this point.
         *
         * @param drawerView Drawer view that is now open
         */
        public void onDrawerOpened(View drawerView);
        /**
         * Called when a drawer has settled in a completely closed state.
         *
         * @param drawerView Drawer view that is now closed
         */
        public void onDrawerClosed(View drawerView);
        /**
         * Called when the drawer motion state changes. The new state will
         * be one of {@link #STATE_IDLE}, {@link #STATE_DRAGGING} or {@link #STATE_SETTLING}.
         *
         * @param newState The new drawer motion state
         */
        public void onDrawerStateChanged(int newState);
    }

上面主要是监听事件的接口,通常回调的时候回用到它,里面的方法有四个,分别是onDrawerSlide(View drawerView, float slideOffset);onDrawerOpened(View drawerView);onDrawerClosed(View
drawerView);onDrawerStateChanged(int newState);

onDrawerSlide(View drawerView, float slideOffset)抽屉改变时使用

onDrawerOpened(View drawerView);打开抽屉

onDrawerClosed(View drawerView)关闭抽屉

onDrawerStateChanged(int newState);改变抽屉的状态

/**
     * Set a simple drawable used for the left or right shadow.
     * The drawable provided must have a nonzero intrinsic width.
     *
     * @param shadowDrawable Shadow drawable to use at the edge of a drawer
     * @param gravity Which drawer the shadow should apply to
     */
    public void setDrawerShadow(Drawable shadowDrawable, int gravity) {
        /*
         * TODO Someone someday might want to set more complex drawables here.
         * They're probably nuts, but we might want to consider registering callbacks,
         * setting states, etc. properly.
         */
        final int absGravity = GravityCompat.getAbsoluteGravity(gravity,
                ViewCompat.getLayoutDirection(this));
        if ((absGravity & Gravity.LEFT) == Gravity.LEFT) {
            mShadowLeft = shadowDrawable;
            invalidate();
        }
        if ((absGravity & Gravity.RIGHT) == Gravity.RIGHT) {
            mShadowRight = shadowDrawable;
            invalidate();
        }
    }

上面这个方法是为了设置用于左或右阴影的简单可拉伸。所提供的可拉伸必须有一个非零固有宽度。

public void setScrimColor(int color) {
        mScrimColor = color;
        invalidate();
    }

设置用于该掩盖的主要内容，而抽屉打开网眼织物的颜色。

public void setDrawerLockMode(int lockMode, int edgeGravity) {
        final int absGravity = GravityCompat.getAbsoluteGravity(edgeGravity,
                ViewCompat.getLayoutDirection(this));
        if (absGravity == Gravity.LEFT) {
            mLockModeLeft = lockMode;
        } else if (absGravity == Gravity.RIGHT) {
            mLockModeRight = lockMode;
        }
        if (lockMode != LOCK_MODE_UNLOCKED) {
            // Cancel interaction in progress
            final ViewDragHelper helper = absGravity == Gravity.LEFT ? mLeftDragger : mRightDragger;
            helper.cancel();
        }
        switch (lockMode) {
            case LOCK_MODE_LOCKED_OPEN:
                final View toOpen = findDrawerWithGravity(absGravity);
                if (toOpen != null) {
                    openDrawer(toOpen);
                }
                break;
            case LOCK_MODE_LOCKED_CLOSED:
                final View toClose = findDrawerWithGravity(absGravity);
                if (toClose != null) {
                    closeDrawer(toClose);
                }
                break;
            // default: do nothing
        }
    }

启用或禁用了所有的抽屉互动。