来源: 互联网  发布时间: 2014-02-18

启动模拟器的问题
       在我前面的文章中，写了关于如果启动Android源码编译出来的模拟器的问题，如果在编译SDK之前启动模拟器，是没有问题的，当编译了SDK，再启动模拟器就会报这样的问题：
ERROR: You did not specify a virtual device name, and the system
directory could not be found.
If you are an Android SDK user, please use '@<name>' or '-avd <name>'
to start a given virtual device (see -help-avd for details).
Otherwise, follow the instructions in -help-disk-images to start the emulator
         在网上寻求答案，有的说没有avd，好吧，那我添加avd，当进入到tools目录下使用 android工具又报错：

SWT folder '/home/archermind/source/source/out/host/linux-x86/framework/x86_64' does not exist.
Please export ANDROID_SWT to point to the folder containing swt.jar for your platform.
       
        跟着解决：
export ANDROID_SWT=/home/archermind/source/source/out/host/linux-x86/framework
         接着使用 /$ android  命令,接着报错：
/$ android

Exception in thread "main" java.lang.UnsatisfiedLinkError: Cannot load 32-bit SWT libraries on 64-bit JVM
at org.eclipse.swt.internal.Library.loadLibrary(Unknown Source)
at org.eclipse.swt.internal.Library.loadLibrary(Unknown Source)
at org.eclipse.swt.internal.C.<clinit>(Unknown Source)
at org.eclipse.swt.internal.Converter.wcsToMbcs(Unknown Source)
at org.eclipse.swt.internal.Converter.wcsToMbcs(Unknown Source)
at org.eclipse.swt.widgets.Display.<clinit>(Unknown Source)
at com.android.sdkmanager.Main.showSdkManagerWindow(Main.java:319)
at com.android.sdkmanager.Main.doAction(Main.java:307)
at com.android.sdkmanager.Main.run(Main.java:116)
at com.android.sdkmanager.Main.main(Main.java:99)

          接着查错，发现净是些关于eclipse的问题，所以我重新整理了一下，看问题的可能所在，看一下大的操作步骤：

             1. make  -----   编译Android源代码
          （编译好了后，先   . /build/envsetup.sh 之后再启动模拟器没有问题）
             2.lunch sdk-eng   -----   指定版本
             3.make  sdk   ------   编译sdk
            （模拟器启动不了了，报错信息看上文）
           所以问题处在2 ，3 步骤，重新make之后还是存在这样的问题，最终，在make前指定版本 ，执行 lunch sdk-eng ，再执行make，这样模拟器就可以使用了。
             








     

    

    来源: 互联网  发布时间: 2014-02-18

编写App的开场Activity
在android的app和游戏的应用中，都会有个开场场景，老外管这个叫splash。
现在就编写个简单的SplashActivity

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.ImageView;

public class SplashActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.splash);

		ImageView splashImg = (ImageView) findViewById(R.id.splash_image);
		splashImg.postDelayed(new Runnable() {//这里利用了View的postDelayed

			public void run() {
				Intent intent = new Intent();
				intent.setClass(SplashActivity.this, MainActivity.class);
				startActivity(intent);
				finish();
			}
		}, 1000);
	}
}

下面是splash.xml，layout 文件了

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

    <ImageView
        android:id="@+id/splash_background"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:scaleType="fitXY"
        android:src="/blog_article/@drawable/splash_floor/index.html" />

    <ImageView
        android:id="@+id/splash_image"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:scaleType="fitXY"
        android:src="/blog_article/@drawable/splash_logo/index.html" />

    <ImageView
        android:id="@+id/splash_foot"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="10.0dip"
        android:src="/blog_article/@drawable/splash_logo_foot/index.html" />

</RelativeLayout>

    

    来源: 互联网  发布时间: 2014-02-18

简单的pickView实现
h文件代码

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
<UIPickerViewDelegate,UIPickerViewDataSource>
{
    UILabel *fontLabel;
    UIPickerView *fontPickView;
    NSArray *fonts;
}
@property (nonatomic ,retain)
IBOutlet UILabel *fontLabel;
@property (nonatomic,retain)
IBOutlet UIPickerView *fontPickView;
@end

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController
@synthesize fontLabel;
@synthesize fontPickView;

- (void)viewDidLoad
{
    [super viewDidLoad];
    fonts = [UIFont familyNames];
    fontPickView.dataSource = self;
    fontPickView.delegate = self;
	// Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
/* 返回列数*/
-(NSInteger) numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 1;}

/*返回行数
 */
-(NSInteger) pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    return [fonts count];
}
/*返回某行某列的值*/
-(NSString *) pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    return [fonts objectAtIndex:row];
}
/*返回某行某列选中的事件*/
-(void) pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    NSString *sfont = [fonts objectAtIndex:row];
    fontLabel.font = [UIFont fontWithName:sfont size:20.0f];
    fontLabel.text =sfont;
}

@end