问题
With the new facebook app it comes with an hidden sidebar that I would love to use something like that in my applications. It looks kinda like the sidebars that firefox mobile have...
Do you have any idea how to implement it besides re-implementing the ViewPager? I've tried with an HorizontalScrollView but that would also lead to re-implementation of it...
I'm not seeing any other way besides these two... any suggestions?
Thanks in advance
回答1:
I came up with a solution... I don't know if it is perfect but it is working well.
So what I did was a single FrameLayout with both of the Layouts stacked together and then I just animate the top layout to slide to the right of the screen (just need to call the slideTo or scrollBy. And basically it's that! Quite simple and effective! (the code though is not very pretty :P)
EDIT:
Some code samples.
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#FFF" >
<include
android:id="@+id/menu_layout"
layout="@layout/menu_list"
android:visibility="invisible"/>
<include
android:id="@+id/news_list_parent"
layout="@layout/main_news_list"
/>
</FrameLayout>
This is the layout xml, quite simpe. The included .xml are simple LinearLayouts with a heading and a listview.
The "magic" happens in the animation:
protected void applyTransformation(float interpolatedTime, Transformation t) {
int newOffset;
if(expanded) {
newOffset = 0;
newOffset = (int)(endOffset*(1-interpolatedTime));
} else {
newOffset = (int)(endOffset*(interpolatedTime));
}
view.scrollTo(-newOffset, 0);
}
The endOffset is the target movement. I set it before I start the animation, and the View I want to animate (in this case is the view with the id=news_list_parent) it is set on the constructor.
But just to understand how that works make a button and its listener would do something like this:
if(viewBeneath.getVisibility() == View.INVISIBLE) {
viewBeneath.setVisibility(View.Visible);
viewToSlide.slideTo(-(width-50), 0);
}
And finally override the back button to do the opposite of the button
if(viewBeneath.getVisibility() == View.VISIBLE) {
viewToSlide.slideTo(0, 0);
viewBeneath.setVisibility(View.Visible);
}
Read this as pseudo-code =) This is what I did in the beginning, that code is lost :P
回答2:
You can try out this. Good Example. Check for slider class..
https://github.com/gitgrimbo/android-sliding-menu-demo
回答3:
I did something like below:
Below is my code for something like facebook side menu bar
- I put 2 views overlap in a frame layout. The bottom view is the menu, the top view is the content body.
- And I put the content body into a horizantal scroll view. I also put a view to the left of the content body in the horizantal scroll view. And set the view's background as transparent.
- Then scroll to content body at begining. So the side menu bar is blocked by the content body.
- When click a button to show the menu, I scroll the horizantal scroll view to show the transparent placeholder. Then the menu will show up since it is under the transparent placeholder now.
I did not use XML for the interface. I create everything in the below code. I think it should be easy to read and put into your eclipse.
package com.chaoshen.androidstudy.facebooklikesidemenubar;
import android.os.Bundle;
import android.app.Activity;
import android.graphics.Color;
import android.view.Display;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MainActivity extends Activity{
private boolean Menu_Displayed=false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Display display = getWindowManager().getDefaultDisplay();
final int width = display.getWidth();
// menu:
LinearLayout li_menu = new LinearLayout(this);
li_menu.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
li_menu.setOrientation(1);//1 is vertical
li_menu.setBackgroundColor(Color.GREEN);
Button btn1 = new Button(this);
btn1.setText("button 1");
btn1.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
li_menu.addView(btn1);
//body:
final HorizontalScrollView hsv = new HorizontalScrollView(this){
@Override
// do not let hsv consume the click itself. Then the view under the hsv will also consume the click
//so that the menu will be clicked
//when menu is not showed up, let hsv be the only view to consume the click.
//so that the menu will not be clicked
public boolean onTouchEvent(MotionEvent ev) {
if(Menu_Displayed){
return false;
}
else{
return true;
}
}
};
hsv.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
hsv.setBackgroundColor(Color.TRANSPARENT);
hsv.setHorizontalFadingEdgeEnabled(false);
hsv.setVerticalFadingEdgeEnabled(false);
final LinearLayout li_body = new LinearLayout(this);
li_body.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.FILL_PARENT));
li_body.setOrientation(0);//0 is horizantal
li_body.setBackgroundColor(Color.TRANSPARENT);
hsv.addView(li_body);
//body: place holder transparent
TextView placeholder = new TextView(this);
placeholder.setTextColor(Color.TRANSPARENT);
placeholder.setLayoutParams(new LayoutParams(width-100, LayoutParams.FILL_PARENT));
placeholder.setVisibility(View.INVISIBLE);
li_body.addView(placeholder);
//body: real content
LinearLayout li_content = new LinearLayout(this);
li_content.setLayoutParams(new LayoutParams(width, LayoutParams.FILL_PARENT));
li_content.setOrientation(1);//1 is vertical
li_content.setBackgroundColor(Color.CYAN);
TextView tv1 = new TextView(this);
tv1.setText("txt 1");
tv1.setTextSize(40);
tv1.setTextColor(Color.BLACK);
TextView tv2 = new TextView(this);
tv2.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
tv2.setTextSize(50);
tv2.setText("txt 2");
tv2.setTextColor(Color.WHITE);
//use this button to scroll
Button btn_showMenu = new Button(this);
btn_showMenu.setText("Menu");
btn_showMenu.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
btn_showMenu.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
hsv.post(new Runnable() {
@Override
public void run() {
if(Menu_Displayed){
hsv.smoothScrollTo(width-100, 0);
}
else{
hsv.smoothScrollTo(0, 0);
}
Menu_Displayed = !Menu_Displayed;
}
});
}
});
li_content.addView(tv1);
li_content.addView(tv2);
li_content.addView(btn_showMenu);
li_body.addView(li_content);
//add menu and body in to frame
FrameLayout mainFrame = new FrameLayout(this);
mainFrame.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
mainFrame.addView(li_menu);
mainFrame.addView(hsv);
//scroll to the body real content to block the menu
hsv.post(new Runnable() {
@Override
public void run() {
hsv.scrollBy(width-100, 0);
}
});
setContentView(mainFrame);
}
}
回答4:
I've created my own solution for this as well, as many stock solutions appeared to not work on older Android version or lacked proper instructions on how to get it to work.
My solution has the following features:
- Provides support for sliding away a view to reveal a menu that lies underneath it
- The menu can be any custom View
- The view above can be any custom View as well
- Supported on old Android versions (tested to work at least on Android 2.2)
The solution uses a custom layout, called SlidingMenuLayout, that you are expected to add 2 views to. The first view you add is the menu, the second is the main view.
The simplest way to add the layout to your existing project is to override your Activity's setContentView() method:
@Override
public void setContentView(View view) {
SlidingMenuLayout layout = new SlidingMenuLayout(this);
layout.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT, 0.0F));
layout.addView(new MenuView(this));
layout.addView(view);
super.setContentView(layout);
}
In this example, MenuView is the view that will actually show the menu. It is up to you to implement this view.
Finally, you can add a button (typically in the top left corner of your main view), that calls openMenu() or closeMenu() on the layout as appropriate.
The code for SlidingMenuLayout is found on the GitHub project page:
来源：https://stackoverflow.com/questions/8453320/android-sidebar-like-facebook-or-firefox