seven的博客

eclipse项目迁移到android studio

Mon, 30 Nov 2015 01:38:05 +0000

准备

1. 将eclipse项目的项目依赖暂时删除。
1. 逐个检查依赖的项目，如果项目项目下有类似 android studio 项目下的文件，全部删除（避免麻烦）
  
  例如：build目录 .idea目录 gradle相关的文件
1. 新建一个 eclipse android lib 项目，将需要迁移的项目本身和所有的依赖项目中重复使用的 jar包复制到新的项目中，然后删除原来的jar包
4.确保前面3步完成。备份好。

第一步，将项目导入成 as 项目，（包括主项目，和库项目，新加的库项目也需要）。

第二步，假设主项目是A 库项目是B，C 新库项目是D

第三步，将库项目加入到主项目中，作为module

第四步，修改项目内的build.gradle 文件，添加依赖：

  `项目A  ： compile project(':B');   compile project(':C');  compile project(':D');`

  `项目B，C  : compile  project(':D')`

android ant打包

Thu, 22 Oct 2015 01:38:05 +0000

1 1.1 对项目执行

android update project –target --path

或者

android update project -t -p

例如

android update project -t android-23 -p . （android版本23, 路径是当前目录）.

1.2 对依赖项目执行

android update lib-project -t android-23 -p .

1.3 最后对项目执行

android update project -n name -t android-23 -p . –subprojects

name 是项目名字

2

上面的步骤导致项目生成2个文件， local.properties和build.xml，每个依赖的项目也会生成这2个文件。

2.1

在项目根目录新建一个 ant.properties 文件.

下面是ant.properties的修改

如果需要修改编译使用到版本为java7，

java.source=7

java.target=7

如果需要加编译参数，

java.compilerargs=-Xlint:deprecation -Xlint:unchecked

(详细可以搜索build.xml中得javac标签)

2.2 添加签名设置

keytool -genkey -alias myalias -keyalg RSA -validity 20000 -keystore my.keystore

其中 myalias 是alias的名字，20000是有效时常20000天， my.keystore是keystore生成的文件名.

往ant.properties添加下面4行

key.store=my.keystore

key.alias=myalias

key.store.password=sanyun (可省)

key.alias.password=sanyun (可省)

后面不能有空格。

2.3 打包

在项目根目录下执行 ant release

3 可能出现的错误

invalid resource directory name: /Users/seven/Documents/workspace-v6.0/appcompat_v7/bin/res crunch

v7包是常见的依赖包，很容易出错，直接删除即可

rm -r /Users/seven/Documents/workspace-v6.0/appcompat_v7/bin/res/crunch

ant clean

ant release

3.1 oom异常

找到 sdk/build-tools/target/dx 文件，打开修改 javaOpts即可

4 打多渠道包

下载 http://ant-contrib.sourceforge.net/

将下载的jar包放在 ant 的安装目录下

4.1 修改 local.properties 文件，加入

ant.dir=/usr/local/Cellar/ant/1.9.6 #ant的安装目录

target.dir=/Users/seven/Desktop/ViewPagerDemo #打包的存放目录

4.2 修改ant.properties 加入

market_channels=Wandoujia,360 #渠道列表，逗号分隔

app_name=ViewPagerDemo #app的名字

app_version=1.0 #app版本 (此时需要在target.dir下面创建一个名叫1.0的目录)。

4.3 修改 build.xml

在下面加入

<!--  多渠道打包加入 -->
    <echo>${market_channels}</echo>  
    <echo>${app_version}</echo>  
    
    <!-- 支持循环执行 -->  
    <taskdef resource="net/sf/antcontrib/antcontrib.properties" >  
        <classpath>  
           <pathelement location="${ant.dir}/ant-contrib-1.0b3.jar" />  
        </classpath>  
    </taskdef>  
    
    <echo>Run ant-contrib-1.0b3.jar ok</echo>  
    
    <target name="deploy">   
        <foreach target="edit_and_build" list="${market_channels}" param="channel" delimiter=",">   
        </foreach>   
    </target>  
    
    <target name="edit_and_build">   
        <echo>Run '${channel}' apk</echo>  
        
		<replaceregexp
		    encoding="utf-8"
		    file="AndroidManifest.xml"
		    flags="s"
		    match='android:name="UMENG_CHANNEL".+android:value="([^"]+)"'
		    replace='android:name="UMENG_CHANNEL" android:value="${channel}"'/>
			
      	<property name="out.final.file"  location="${target.dir}/${app_version}/${app_name} V${app_version}(${channel}).apk" /> 
	    <antcall target="clean" />  
	    <antcall target="release" />  
     
    </target> 
     <!-- 多渠道打包结束 -->

4.4 打包

ant deploy

android 尺寸

Wed, 21 Oct 2015 11:38:05 +0000

dp <=> px

public static float convertDpToPixel(float dp, Context context){
    Resources resources = context.getResources();
    DisplayMetrics metrics = resources.getDisplayMetrics();
    float px = dp * (metrics.densityDpi / 160f);
    //  float px = dp * metrics.density;
    return px;
}

public static float convertPixelsToDp(float px, Context context){
    Resources resources = context.getResources();
    DisplayMetrics metrics = resources.getDisplayMetrics();
    float dp = px / (metrics.densityDpi / 160f);
    // float dp = px / metrics.density;
    return dp;
}

metrics.densityDpi 是屏幕像素密度，即一英寸有多少个像素，

标准情况下1dp=1px，即设备的像素密度为160

另一种实现

public static float convertDpToPixel(float dp, Context context){
    Resources resources = context.getResources();
    DisplayMetrics metrics = resources.getDisplayMetrics();
    float px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, metrics);
    return px;
}

sp <=> px

public static int px2sp(Context context, float pxValue) {
		final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
		return (int) (pxValue / fontScale + 0.5f);
}

public static int sp2px(Context context, float spValue) {
		final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
		return (int) (spValue * fontScale + 0.5f);
}

因为使用px的时候，需要的是整数，因此可以利用4舍5入法转换。

另一种实现

// 此类方法可以将多重尺寸单位转化成px(像素)
public static float convertDpToPixel(float sp, Context context){
    Resources resources = context.getResources();
    DisplayMetrics metrics = resources.getDisplayMetrics();
    float px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, sp, metrics);
    return px;
}

android动画效果

Sun, 06 Sep 2015 15:49:05 +0000

问题

常见动画效果封装. 简单实用

下面是动画实现工具代码

import android.view.View;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.AnimationSet;
import android.view.animation.AnticipateInterpolator;
import android.view.animation.AnticipateOvershootInterpolator;
import android.view.animation.BounceInterpolator;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.LinearInterpolator;
import android.view.animation.OvershootInterpolator;
import android.view.animation.RotateAnimation;
import android.view.animation.ScaleAnimation;
import android.view.animation.TranslateAnimation;

public class AnimationController
{
	public final int rela1 = Animation.RELATIVE_TO_SELF;
	public final int rela2 = Animation.RELATIVE_TO_PARENT;

	public final int Default = -1;
	public final int Linear = 0;
	public final int Accelerate = 1;
	public final int Decelerate = 2;
	public final int AccelerateDecelerate = 3;
	public final int Bounce = 4;
	public final int Overshoot = 5;
	public final int Anticipate = 6;
	public final int AnticipateOvershoot = 7;

	// LinearInterpolator,AccelerateInterpolator,DecelerateInterpolator,AccelerateDecelerateInterpolator,
	// BounceInterpolator,OvershootInterpolator,AnticipateInterpolator,AnticipateOvershootInterpolator

	public AnimationController()
	{
	}

	private class MyAnimationListener implements AnimationListener
	{
		private View view;

		public MyAnimationListener(View view)
		{
			this.view = view;
		}

		@Override
		public void onAnimationStart(Animation animation)
		{
			// this.view.setVisibility(View.VISIBLE);
		}

		@Override
		public void onAnimationEnd(Animation animation)
		{
			this.view.setVisibility(View.GONE);
		}

		@Override
		public void onAnimationRepeat(Animation animation)
		{
		}

	}
	
	private void setEffect(Animation animation, int interpolatorType, long durationMillis, long delayMillis)
	{
		switch (interpolatorType)
		{
		case 0:
			animation.setInterpolator(new LinearInterpolator());
			break;
		case 1:
			animation.setInterpolator(new AccelerateInterpolator());
			break;
		case 2:
			animation.setInterpolator(new DecelerateInterpolator());
			break;
		case 3:
			animation.setInterpolator(new AccelerateDecelerateInterpolator());
			break;
		case 4:
			animation.setInterpolator(new BounceInterpolator());
			break;
		case 5:
			animation.setInterpolator(new OvershootInterpolator());
			break;
		case 6:
			animation.setInterpolator(new AnticipateInterpolator());
			break;
		case 7:
			animation.setInterpolator(new AnticipateOvershootInterpolator());
			break;
		default:
			break;
		}
		animation.setDuration(durationMillis);
		animation.setStartOffset(delayMillis);
	}

	private void baseIn(View view, Animation animation, long durationMillis, long delayMillis)
	{
		setEffect(animation, Default, durationMillis, delayMillis);
		view.setVisibility(View.VISIBLE);
		view.startAnimation(animation);
	}

	private void baseOut(View view, Animation animation, long durationMillis, long delayMillis)
	{
		setEffect(animation, Default, durationMillis, delayMillis);
		animation.setAnimationListener(new MyAnimationListener(view));
		view.startAnimation(animation);
	}
	
	public void show(View view)
	{
		view.setVisibility(View.VISIBLE);
	}
	public void hide(View view)
	{
		view.setVisibility(View.GONE);
	}
	public void transparent(View view)
	{
		view.setVisibility(View.INVISIBLE);
	}
	
	public void fadeIn(View view, long durationMillis, long delayMillis)
	{
		AlphaAnimation animation = new AlphaAnimation(0, 1);
		baseIn(view, animation, durationMillis, delayMillis);
	}

	public void fadeOut(View view, long durationMillis, long delayMillis)
	{
		AlphaAnimation animation = new AlphaAnimation(1, 0);
		baseOut(view, animation, durationMillis, delayMillis);
	}

	public void slideIn(View view, long durationMillis, long delayMillis)
	{
		TranslateAnimation animation = new TranslateAnimation(rela1, 0, rela1, 0, rela1, -1, rela1, 0);
		baseIn(view, animation, durationMillis, delayMillis);
	}

	public void slideOut(View view, long durationMillis, long delayMillis)
	{
		TranslateAnimation animation = new TranslateAnimation(rela1, 0, rela1, 0, rela1, 0, rela1, -1);
		baseOut(view, animation, durationMillis, delayMillis);
	}

	public void scaleIn(View view, long durationMillis, long delayMillis)
	{
		ScaleAnimation animation = new ScaleAnimation(0, 1, 0, 1, rela2, 0.5f, rela2, 0.5f);
		baseIn(view, animation, durationMillis, delayMillis);
	}

	public void scaleOut(View view, long durationMillis, long delayMillis)
	{
		ScaleAnimation animation = new ScaleAnimation(1, 0, 1, 0, rela2, 0.5f, rela2, 0.5f);
		baseOut(view, animation, durationMillis, delayMillis);
	}

	public void rotateIn(View view, long durationMillis, long delayMillis)
	{
		RotateAnimation animation = new RotateAnimation(-90, 0, rela1, 0, rela1, 1);
		baseIn(view, animation, durationMillis, delayMillis);
	}

	public void rotateOut(View view, long durationMillis, long delayMillis)
	{
		RotateAnimation animation = new RotateAnimation(0, 90, rela1, 0, rela1, 1);
		baseOut(view, animation, durationMillis, delayMillis);
	}

	public void scaleRotateIn(View view, long durationMillis, long delayMillis)
	{
		ScaleAnimation animation1 = new ScaleAnimation(0, 1, 0, 1, rela1, 0.5f, rela1, 0.5f);
		RotateAnimation animation2 = new RotateAnimation(0, 360, rela1, 0.5f, rela1, 0.5f);
		AnimationSet animation = new AnimationSet(false);
		animation.addAnimation(animation1);
		animation.addAnimation(animation2);
		baseIn(view, animation, durationMillis, delayMillis);
	}

	public void scaleRotateOut(View view, long durationMillis, long delayMillis)
	{
		ScaleAnimation animation1 = new ScaleAnimation(1, 0, 1, 0, rela1, 0.5f, rela1, 0.5f);
		RotateAnimation animation2 = new RotateAnimation(0, 360, rela1, 0.5f, rela1, 0.5f);
		AnimationSet animation = new AnimationSet(false);
		animation.addAnimation(animation1);
		animation.addAnimation(animation2);
		baseOut(view, animation, durationMillis, delayMillis);
	}

	public void slideFadeIn(View view, long durationMillis, long delayMillis)
	{
		// 从上面滑进
		TranslateAnimation animation1 = new TranslateAnimation(rela1, 0, rela1, 0, rela1, -1, rela1, 0);
		// 从全透明到不透明
		AlphaAnimation animation2 = new AlphaAnimation(0, 1);
		AnimationSet animation = new AnimationSet(false);
		animation.addAnimation(animation1);
		animation.addAnimation(animation2);
		baseIn(view, animation, durationMillis, delayMillis);
	}

	public void slideFadeOut(View view, long durationMillis, long delayMillis)
	{
		// 从上面滑出
		TranslateAnimation animation1 = new TranslateAnimation(rela1, 0, rela1, 0, rela1, 0, rela1, -1);
		// 从不透明到全透明
		AlphaAnimation animation2 = new AlphaAnimation(1, 0);
		AnimationSet animation = new AnimationSet(false);
		animation.addAnimation(animation1);
		animation.addAnimation(animation2);
		baseOut(view, animation, durationMillis, delayMillis);
	}
}

上面的代码只是解释了位置变换的动画效果实现，其他效果也是同样地道理

注意

滑动的view是在其父view的窗口中滑动的，所以如果不想看到滑动的view遮盖 兄弟view，那么应该给该view加一层父view（推荐RelativeLayout）

进度条

Fri, 14 Aug 2015 14:06:05 +0000

问题

自定义可一个系统风格的进度条. 简单实用

下面是布局文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:background="@color/transparent"
    android:layout_height="match_parent" >

    <ProgressBar
        style="@android:style/Widget.Holo.ProgressBar.Large"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:background="@color/transparent"
        />
    
    <TextView 
        android:layout_centerInParent="true"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="12sp"
        android:textColor="@color/Write"
        android:text="加载中.."
        />
</RelativeLayout>

下面是使用方法 (改写ProgressDialog的contentView).

// 显示进度条

public void showPd(Context context) {

		if (mProgressDialog == null) {
			mProgressDialog = new ProgressDialog(context);
		}
		
		
		WindowManager.LayoutParams lp = mProgressDialog.getWindow().getAttributes();
		lp.gravity = Gravity.CENTER;
		mProgressDialog.getWindow().setAttributes(lp);
		mProgressDialog.show();

		mProgressDialog.setContentView(R.layout.progress_wheel);
		
}

// 隐藏进度条

public void dismissPd(){
		if(mProgressDialog != null && mProgressDialog.isShowing()){
			mProgressDialog.dismiss();
		}
}

解决输入的textField和textView被键盘遮挡的问题

Fri, 07 Aug 2015 15:18:05 +0000

问题

在IOS编程中，如果一样页面的输入框比较低，在键盘弹出来的时候，总是遮挡住输入框。本文是处理这种情况的一个解决方案。

解决方法

通告键这样的处理方法编写一个工具类，主要参考了官方的方法。

下面是头文件

// KeyboardHandler.h

#import <Foundation/Foundation.h>

typedef enum DragDirectionForEnd
{
    DRAG_DIRECTION_NORMAL, // 上下滑皆可终止
    DRAG_DIRECTION_TOP,    // 上滑终止
    DRAG_DIRECTION_BOTTOM  // 下滑终止
} DragDirections;

@protocol KeyboardHandlerDelegate <NSObject>

- (UIView*) getPresentedView;

@end

@interface KeyboardHandler : NSObject

@property (nonatomic, weak) UIScrollView* scrollView;
@property (nonatomic, assign) id<KeyboardHandlerDelegate> delegate;
@property (nonatomic) DragDirections dragdirection;

- (instancetype)initWithScrollView:(UIScrollView*)scrollView;
- (void)start;
- (void)stop;

@end

下面是实现文件

#import "KeyboardHandler.h"

@interface KeyboardHandler()<UIScrollViewDelegate>
{
    CGFloat kbHeight;
    CGFloat lastContentOffset;
}

@end

@implementation KeyboardHandler
@synthesize scrollView;
@synthesize dragdirection;

- (instancetype) initWithScrollView:(UIScrollView *)scrollVie
{
    self = [super init];
    if (self) {
        scrollView = scrollVie;
        scrollView.delegate = self;
        dragdirection = DRAG_DIRECTION_NORMAL;
    }
    return self;
}
- (void)start
{
    [self registerForKeyboardNotifications];
}

- (void)stop
{
    [[NSNotificationCenter defaultCenter] removeObserver:self ];
}

- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self ];
}

# pragma - 键盘遮挡处理

- (void)registerForKeyboardNotifications
{
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWasShown:)
                                                 name:UIKeyboardWillChangeFrameNotification object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillBeHidden:)
                                                 name:UIKeyboardWillHideNotification object:nil];
    
}

- (void) keyboardWasShown:(NSNotification*)aNotification
{
    UIView* presented = nil;
    if (_delegate) {
        presented = [_delegate getPresentedView];
        if (!presented) {
            return;
        }
    }else {
        return;
    }
    NSDictionary* info = [aNotification userInfo];
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
    if (kbSize.height == kbHeight) {
        return ;
    } else if (kbSize.height < kbHeight){
        
        // 处理键盘高度变小时的情况
        CGFloat offSet = kbSize.height - kbHeight;
        CGPoint contentOffset = scrollView.contentOffset;
        contentOffset.y += offSet;
        [scrollView setContentOffset:contentOffset animated:YES];
    }
    kbHeight = kbSize.height;
    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0);
    self.scrollView.contentInset = contentInsets;
    self.scrollView.scrollIndicatorInsets = contentInsets;
    CGRect screenRect = [[UIScreen mainScreen] bounds];
    screenRect.size.height -= kbSize.height;
    
    // 将输入框的左下角的点移动到可视
    CGPoint presentedAbsolutePosition = [presented.superview convertPoint:presented.frame.origin toView:nil];
    presentedAbsolutePosition.y += presented.frame.size.height;

    if (!CGRectContainsPoint(screenRect, presentedAbsolutePosition)) {
       [self.scrollView scrollRectToVisible:presented.frame animated:YES];
    }
}

- (void) keyboardWillBeHidden:(NSNotification*)aNotification
{
    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, 0.0, 0.0);;
    scrollView.contentInset = contentInsets;
    scrollView.scrollIndicatorInsets = contentInsets;
    kbHeight = 0;
}

#pragma scrollview

// 手势滑动开始
- (void)scrollViewWillBeginDragging:(UIScrollView *)scroll
{
    if (dragdirection == DRAG_DIRECTION_NORMAL) {
        UIView* view = [_delegate getPresentedView];
        if ([view respondsToSelector:@selector(endEditing:)]){
            [[_delegate getPresentedView] endEditing:YES];
        }
    } else {
        lastContentOffset = scroll.contentOffset.y;
    }
}
// 手势滑动结束
- (void)scrollViewDidEndDragging:(UIScrollView *)ascrollView willDecelerate:(BOOL)decelerate
{
    if (dragdirection != DRAG_DIRECTION_NORMAL) {
        if (lastContentOffset > ascrollView.contentOffset.y && dragdirection == DRAG_DIRECTION_BOTTOM) {
            UIView* view = [_delegate getPresentedView];
            if ([view respondsToSelector:@selector(endEditing:)]){
                [[_delegate getPresentedView] endEditing:YES];
            }
        } else if (lastContentOffset < ascrollView.contentOffset.y && dragdirection == DRAG_DIRECTION_TOP){
            UIView* view = [_delegate getPresentedView];
            if ([view respondsToSelector:@selector(endEditing:)]){
                [[_delegate getPresentedView] endEditing:YES];
            }
        }
    }

    
}

@end

使用方法

@interface TestController () <KeyboardHandlerDelegate>
{
    UIView* edittingView;
    KeyboardHandler* keyboardHandler;
}

@property (strong, nonatomic) IBOutlet UITextView *yourInputView;

@end

@implementation TestController

- (void)viewDidLoad
{
    [super viewDidLoad];
    keyboardHandler = [[KeyboardHandler alloc] initWithScrollView:self.scrollView];
    keyboardHandler.delegate = self;
    yourInputView.delegate = self;
}

- (void)viewWillAppear:(BOOL)animated
{
    [keyboardHandler start];
}

- (void)viewDidDisappear:(BOOL)animated
{
    [keyboardHandler stop];
}

#pragma mark - KeyboardHandlerDelegate

- (UIView*)getPresentedView
{
    return edittingView;
}

- (BOOL)textViewShouldBeginEditing:(UITextView *)textView
{
    edittingView = textView;
    return true;
}

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
    edittingView = textField;
    return YES;
}

可滑动的View在可滑动的View中

Fri, 24 Jul 2015 14:06:05 +0000

问题

如果直接在一个scrollview中添加一个EditText，你会发现，EditText不能滑动。

解决办法

1

// 重写view的这个方法，就是告诉父view，不要截获我的触摸事件。
@Override  
public boolean dispatchTouchEvent(MotionEvent ev) { 
   	getParent().requestDisallowInterceptTouchEvent(true);
   	return super.dispatchTouchEvent(ev);  
}

2

下面这个方法，不用重写view（推荐）

// 实现onTouchListener

public boolean onTouch(View v, MotionEvent event) {
    v.getParent().requestDisallowInterceptTouchEvent(true);
    switch (event.getAction()&MotionEvent.ACTION_MASK){
        case MotionEvent.ACTION_UP:
            v.getParent().requestDisallowInterceptTouchEvent(false);
            break;
    }
    return false;
}

引用自知识空间

GridView 和 ListView 被包含在 ScrollView 中

Fri, 24 Jul 2015 14:06:05 +0000

问题

很多时候，我们需要在ScrollView中包含一个ListView或者GridView。

现在，公司的项目遇到这种需求，但是我发现直接在ScrollView中包含一个

ListView或者GridView，ListView的内容并没有像预想那样全部显示，

而是只显示部分内容。

解决方法

重写ListView或者GridView

这是stackoverflow上得一个解决方法：

public class ExpandableHeightGridView extends GridView
{

    boolean expanded = false;

    public ExpandableHeightGridView(Context context)
    {
        super(context);
    }

    public ExpandableHeightGridView(Context context, AttributeSet attrs)
    {
        super(context, attrs);
    }

    public ExpandableHeightGridView(Context context, AttributeSet attrs,
            int defStyle)
    {
        super(context, attrs, defStyle);
    }

    public boolean isExpanded()
    {
        return expanded;
    }

    @Override
    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {
        if (isExpanded())
        {
            
            // AT_MOST 模式会让GridView计算出所有child出现时的高度
            int expandSpec = MeasureSpec.makeMeasureSpec(MEASURED_SIZE_MASK,
                    MeasureSpec.AT_MOST);
            super.onMeasure(widthMeasureSpec, expandSpec);

            ViewGroup.LayoutParams params = getLayoutParams();
            params.height = getMeasuredHeight();
        }
        else
        {
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        }
    }

    public void setExpanded(boolean expanded)
    {
        this.expanded = expanded;
    }
}

正常情况下，这是一个正常的GirdView 只有将expanded设置为true时才会全部展示。

如果ListView想要同样地效果，修改的代码是一样的。

使用

布局的例子

<com.example.ExpandableHeightGridView
    android:id="@+id/myId"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:horizontalSpacing="2dp"
    android:isScrollContainer="false"
    android:numColumns="4"
    android:stretchMode="columnWidth"
    android:verticalSpacing="20dp" />

java代码

mAppsGrid = (ExpandableHeightGridView) findViewById(R.id.myId);
mAppsGrid.setExpanded(true);

seven的博客

eclipse项目迁移到android studio

准备

第一步，将项目导入成 as 项目，（包括主项目，和库项目，新加的库项目也需要）。

第二步，假设 主项目是A 库项目是B，C 新库项目是D

第三步，将库项目加入到主项目中，作为module

第四步，修改项目内的build.gradle 文件，添加依赖：

android ant打包

1

1.1 对项目执行

1.2 对依赖项目执行

1.3 最后对项目执行

2

2.1

2.2 添加签名设置

2.3 打包

3 可能出现的错误

3.1 oom异常

4 打多渠道包

4.1 修改 local.properties 文件，加入

4.2 修改ant.properties 加入

4.3 修改 build.xml

4.4 打包

android 尺寸

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第二步，假设主项目是A 库项目是B，C 新库项目是D