使用ViewDragHelper实现上拉效果

该例子位于 https://github.com/umano/AndroidSlidingUpPanel

ViewDragHelper的用法：
http://flavienlaurent.com/blog/2013/08/28/each-navigation-drawer-hides-a-viewdraghelper/
Android ViewDragHelper完全解析 自定义ViewGroup神器
http://www.open-open.com/lib/view/open1437282182021.html

上拉前：


上拉中：



上拉后：



使用：

package com.sothree.slidinguppanel.demo;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.text.Html;
import android.text.method.LinkMovementMethod;
import android.util.Log;
import android.util.TypedValue;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.Button;
import android.widget.TextView;

import com.nineoldandroids.view.animation.AnimatorProxy;
import com.sothree.slidinguppanel.SlidingUpPanelLayout;
import com.sothree.slidinguppanel.SlidingUpPanelLayout.PanelSlideListener;

public class DemoActivity extends Activity {
    private static final String TAG = "DemoActivity";

    public static final String SAVED_STATE_ACTION_BAR_HIDDEN = "saved_state_action_bar_hidden";

    private SlidingUpPanelLayout mLayout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().requestFeature(Window.FEATURE_ACTION_BAR_OVERLAY);
        setContentView(R.layout.activity_demo);

        mLayout = (SlidingUpPanelLayout) findViewById(R.id.sliding_layout);
        mLayout.setPanelSlideListener(new PanelSlideListener() {
            @Override
            public void onPanelSlide(View panel, float slideOffset) {
                Log.i(TAG, "onPanelSlide, offset " + slideOffset);
                setActionBarTranslation(mLayout.getCurrentParalaxOffset());
            }

            @Override
            public void onPanelExpanded(View panel) {
                Log.i(TAG, "onPanelExpanded");

            }

            @Override
            public void onPanelCollapsed(View panel) {
                Log.i(TAG, "onPanelCollapsed");

            }

            @Override
            public void onPanelAnchored(View panel) {
                Log.i(TAG, "onPanelAnchored");
            }

            @Override
            public void onPanelHidden(View panel) {
                Log.i(TAG, "onPanelHidden");
            }
        });

        TextView t = (TextView) findViewById(R.id.main);
        t = (TextView) findViewById(R.id.name);
        t.setText(Html.fromHtml(getString(R.string.hello)));
        

        boolean actionBarHidden = savedInstanceState != null && savedInstanceState.getBoolean(SAVED_STATE_ACTION_BAR_HIDDEN, false);
        if (actionBarHidden) {
            int actionBarHeight = getActionBarHeight();
            setActionBarTranslation(-actionBarHeight);//will "hide" an ActionBar
        }
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putBoolean(SAVED_STATE_ACTION_BAR_HIDDEN, mLayout.isPanelExpanded());
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.demo, menu);
        MenuItem item = menu.findItem(R.id.action_toggle);
        if (mLayout != null) {
            if (mLayout.isPanelHidden()) {
                item.setTitle(R.string.action_show);
            } else {
                item.setTitle(R.string.action_hide);
            }
        }

        return true;
    }

    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        return super.onPrepareOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()){
            case R.id.action_toggle: {
                if (mLayout != null) {
                    if (!mLayout.isPanelHidden()) {
                        mLayout.hidePanel();
                        item.setTitle(R.string.action_show);
                    } else {
                        mLayout.showPanel();
                        item.setTitle(R.string.action_hide);
                    }
                }
                return true;
            }
            case R.id.action_anchor: {
                if (mLayout != null) {
                    if (mLayout.getAnchorPoint() == 1.0f) {
                        mLayout.setAnchorPoint(0.7f);
                        mLayout.expandPanel(0.7f);
                        item.setTitle(R.string.action_anchor_disable);
                    } else {
                        mLayout.setAnchorPoint(1.0f);
                        mLayout.collapsePanel();
                        item.setTitle(R.string.action_anchor_enable);
                    }
                }
                return true;
            }
        }
        return super.onOptionsItemSelected(item);
    }

    private int getActionBarHeight(){
        int actionBarHeight = 0;
        TypedValue tv = new TypedValue();
        if (getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true)) {
            actionBarHeight = TypedValue.complexToDimensionPixelSize(tv.data,getResources().getDisplayMetrics());
        }
        return actionBarHeight;
    }

    public void setActionBarTranslation(float y) {
        // Figure out the actionbar height
        int actionBarHeight = getActionBarHeight();
        // A hack to add the translation to the action bar
        ViewGroup content = ((ViewGroup) findViewById(android.R.id.content).getParent());
        int children = content.getChildCount();
        for (int i = 0; i < children; i++) {
            View child = content.getChildAt(i);
            if (child.getId() != android.R.id.content) {
                if (y <= -actionBarHeight) {
                    child.setVisibility(View.GONE);
                } else {
                    child.setVisibility(View.VISIBLE);
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
                        child.setTranslationY(y);
                    } else {
                        AnimatorProxy.wrap(child).setTranslationY(y);
                    }
                }
            }
        }
    }

    @Override
    public void onBackPressed() {
        if (mLayout != null && mLayout.isPanelExpanded() || mLayout.isPanelAnchored()) {
            mLayout.collapsePanel();
        } else {
            super.onBackPressed();
        }
    }
}

布局：

<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=".DemoActivity" >

    <com.sothree.slidinguppanel.SlidingUpPanelLayout
        xmlns:sothree="http://schemas.android.com/apk/res-auto"
        android:id="@+id/sliding_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="bottom"
        sothree:panelHeight="68dp"
        sothree:shadowHeight="4dp"
        sothree:paralaxOffset="100dp"
        sothree:dragView="@+id/dragView">

        <!-- MAIN CONTENT -->
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:paddingTop="?android:attr/actionBarSize">
            <TextView
                android:id="@+id/main"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:gravity="center"
                android:text="Main Content"
                android:clickable="true"
                android:focusable="false"
                android:focusableInTouchMode="true"
                android:textSize="16sp" />
        </LinearLayout>

        <!-- SLIDING LAYOUT -->
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="#eeeeee"
            android:orientation="vertical"
            android:clickable="true"
            android:focusable="false"
            android:id="@+id/dragView">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="68dp"
                android:orientation="horizontal">

                <TextView
                    android:id="@+id/name"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_weight="1"
                    android:textSize="14sp"
                    android:gravity="center_vertical"
                    android:paddingLeft="10dp"/>

            </LinearLayout>

            <ImageView
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:scaleType="fitStart"
                android:src="@drawable/graphic" >
            </ImageView>
        </LinearLayout>
    </com.sothree.slidinguppanel.SlidingUpPanelLayout>

</RelativeLayout>

一个侧滑效果：
https://github.com/BlueMor/DragLayout