来源: 互联网  发布时间: 2014-02-18

Gallery显示，读取SD卡内的图片
在图片当道的如下，还是有图更有说服力。
小子不才，所以这个demo是我东找西找然后自己凑的一个例子。内有失当之处，多包涵多指正！
  等了三天才能发帖子，这点JAVAEYE真的应该改变一下了，要不然把我这样的孩子憋生啥样了。。。
1。首先定义xml
  <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
    android:background="#55000000"
  >
  <ImageSwitcher                          //此控件与Gallery会经常用的，切记
  android:id="@+id/switcher"
  android:layout_width="wrap_content"
  android:layout_height="350dip"
  android:layout_alignParentLeft="true"
  android:layout_alignParentRight="true"
  />
  <Gallery
  android:id="@+id/mygallery"
  android:layout_width="fill_parent"
  android:layout_height="80dp"
  android:layout_alignParentBottom="true"
  android:layout_alignParentLeft="true"
  android:gravity="center_vertical"
  android:spacing="16dp"
  />
 
 
  </RelativeLayout>
2。Activity中要自定义显示
package com.ldci.second.mypnone;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.view.View.OnClickListener;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.Toast;
import android.widget.ViewSwitcher;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Gallery.LayoutParams;

public class BgPictureShowActivity extends Activity implements
AdapterView.OnItemSelectedListener, ViewSwitcher.ViewFactory  {

private List<String> ImageList;
private String []list;
  private ImageSwitcher mSwitcher;
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
// //去掉状态栏，且显示自己程序名称
//        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
// WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.pictureshow);

ImageList=getSD();
        list = ImageList.toArray(new String[ImageList.size()]);
   
    /*设定Switcher*/
    mSwitcher = (ImageSwitcher) findViewById(R.id.switcher);
    mSwitcher.setFactory(this);
    /*设定载入Switcher的模式*/
    mSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,
            android.R.anim.fade_in));
    /*设定输出Switcher的模式*/
    mSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,
            android.R.anim.fade_out));
    mSwitcher.setOnClickListener(new OnClickListener(){


public void onClick(View v) {
  Toast.makeText(BgPictureShowActivity.this, "点击了", Toast.LENGTH_SHORT).show();

}
   
    });
   
    Gallery g = (Gallery) findViewById(R.id.mygallery);
           
    /*新增几ImageAdapter并设定给Gallery对象*/
    g.setAdapter(new ImageAdapter(this,getSD()));
   
    g.setOnItemSelectedListener(this);

    /*设定一个itemclickListener事件*/
    g.setOnItemClickListener(new OnItemClickListener()
    {
      public void onItemClick(AdapterView<?> parent,
                       View v, int position, long id)
      {
      Toast.makeText(BgPictureShowActivity.this, "dianjiale ", Toast.LENGTH_SHORT).show();
      }
    });
}

  private List<String> getSD()
  {
    /* 设定目前所在路径 */
    List<String> it=new ArrayList<String>();     
    File f=new File("/sdcard/"); 
    File[] files=f.listFiles();

    /* 将所有文件存入ArrayList中 */
    for(int i=0;i<files.length;i++)
    {
      File file=files[i];
      if(getImageFile(file.getPath()))
        it.add(file.getPath());
    }
    return it;
  }
   
  private boolean getImageFile(String fName)
  {
    boolean re;
   
    /* 取得扩展名 */
    String end=fName.substring(fName.lastIndexOf(".")+1,
                  fName.length()).toLowerCase();
   
    /* 按扩展名的类型决定MimeType */
    if(end.equals("jpg")||end.equals("gif")||end.equals("png")
            ||end.equals("jpeg")||end.equals("bmp"))
    {
      re=true;
    }
    else
    {
      re=false;
    }
    return re;
  }

  /*改写BaseAdapter自定义一ImageAdapter class*/
  public class ImageAdapter extends BaseAdapter
  {
    /*声明变量*/
    int mGalleryItemBackground;
    private Context mContext;
    private List<String> lis;
   
    /*ImageAdapter的构造符*/
    public ImageAdapter(Context c,List<String> li)
    {
      mContext = c;
      lis=li;
      /* 使用res/values/attrs.xml中的<declare-styleable>定义
      * 的Gallery属性.*/
      TypedArray a = obtainStyledAttributes(R.styleable.Gallery);
      /*取得Gallery属性的Index id*/
      mGalleryItemBackground = a.getResourceId(
          R.styleable.Gallery_android_galleryItemBackground, 0);
      /*让对象的styleable属性能够反复使用*/
      a.recycle();
    }
   
    /*几定要重写的方法getCount,传回图片数目*/
    public int getCount()
    {
      return lis.size();
    }
    /*一定要重写的方法getItem,传回position*/
    public Object getItem(int position)
    {
      return position;
    }
   
    /*一定要重写的方法getItemId,传并position*/
    public long getItemId(int position)
    {
      return position;
    }
   
    /*几定要重写的方法getView,传并几View对象*/
    public View getView(int position, View convertView,
                          ViewGroup parent)
    {
      /*产生ImageView对象*/
      ImageView i = new ImageView(mContext);
      /*设定图片给imageView对象*/
      Bitmap bm = BitmapFactory.decodeFile(lis.
                            get(position).toString());
      i.setImageBitmap(bm);
      /*重新设定图片的宽高*/
      i.setScaleType(ImageView.ScaleType.FIT_XY);
      /*重新设定Layout的宽高*/
      i.setLayoutParams(new Gallery.LayoutParams(136, 88));
      /*设定Gallery背景图*/
      i.setBackgroundResource(mGalleryItemBackground);
      /*传回imageView对象*/
      return i;
    }    
  }


public void onItemSelected(AdapterView<?> parent, View view, int position,
long id) {
  String  photoURL=list[position];
  Log.i("A",String.valueOf(position));

      mSwitcher.setImageURI(Uri.parse(photoURL));

}

public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub

}

public View makeView() {
    ImageView i = new ImageView(this);
    i.setBackgroundColor(0xFF000000);
    i.setScaleType(ImageView.ScaleType.FIT_CENTER);
    i.setLayoutParams(new ImageSwitcher.LayoutParams(
        LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT));
    return i;
}
}
这段代码很长，看的时候肯定会头疼加DAN疼，但是一定要挺住啊，MARS大神一再告诫咱们，这个行业的特点就是要有耐心。
3。对了，还有一个非常重要的事情，就是在values文件夹下面，新建一个xml，内书：
<?xml version="1.0" encoding="utf-8"?>
<resources>
  <declare-styleable name="Gallery">
    <attr name="android:galleryItemBackground" />
  </declare-styleable>
</resources>
最后就成功了。

    

    来源: 互联网  发布时间: 2014-02-18

Foursquare 源码研究之------登录续

上次说到了登录回调方法onPostExecute,此方法是AsyncTask的方法,当doInBackground方法执行完后调用此方法来处理返回结果.在onPostExecute中主要根据登录结果来做不同的事情,登录成功://发送登录广播

sendBroadcast(new Intent(Foursquared.INTENT_ACTION_LOGGED_IN)); 

此广播的订阅时在Foursquared类中实现的,首先看此类Foursquared extends Application,Application是android项目运行的一个全局的状态 "Base class for those who need to maintain global application state". 可以在Manifest.xml中指定你自定义的application. 在此类中有一个LoggedInOutBroadcastReceiver 来处理接收到的广播,然后广播发送一个message.此message对应有一个TaskHandler.在foursquare中他使用了

mTaskThread = new HandlerThread(TAG + "-AsyncThread");
mTaskThread.start();
mTaskHandler = new TaskHandler(mTaskThread.getLooper());

 上面的方式来创建Handler. 是为了让handler运行在新的线程中. 接下来看handleMessage方法对msg的处理.第一个switch case语句是MESSAGE_UPDATE_USER, 更新一下用户的信息.同时保存在SharedPreferenses中.

 

接下来开始一个更新UI的Service  foursquared.requestStartService(); 主要调用FoursquaredService类的updateWidgets方法来更新widget.也是在Foursquared类中来进行更新,看handleMessage():

 case MESSAGE_START_SERVICE: //updateWidgets更新组件
    Intent serviceIntent = new Intent(Foursquared.this, FoursquaredService.class);
      serviceIntent.setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
      startService(serviceIntent);
      return;

 启动一个FoursquaredService.

 

接下来返回到主界面 

 // Launch the main activity to let the user do anything.
                Intent intent = new Intent(LoginActivity.this, MainActivity.class);
                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                startActivity(intent);

 如果登录失败:

sendBroadcast(new Intent(Foursquared.INTENT_ACTION_LOGGED_OUT));//发送登出广播.
NotificationsUtil.ToastReasonForFailure(LoginActivity.this, mReason);//根据不同的exception来提示失败信息

 最后关闭进度条dismissProgressDialog().

到这里登录就结束了.写的比较乱.呵呵.

    

    来源: 互联网  发布时间: 2014-02-18

Dialog&Notification&OptionsMenu练习
下面的menu没有意义，仅仅是个练习而已，看图先：

布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
	android:id="@+id/textViewName"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/name"
    android:textSize="20dp"
    />
    <EditText 
    android:id="@+id/editTextName"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
    <TextView  
	android:id="@+id/textViewAge"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/age"
    android:textSize="20dp"
    />
    <EditText 
    android:id="@+id/editTextAge"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
</LinearLayout>

view：

package com.dc.app;

import java.util.Calendar;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.ProgressDialog;
import android.app.TimePickerDialog;
import android.content.DialogInterface;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.TimePicker;
import android.widget.Toast;

public class AppActivity extends Activity {
	private static final String TAG="AppActivity";
	private TextView textViewName,textViewAge;
	private EditText editTextName,editTextAge;
	private final int menuIdRegiste=1;
	private final int menuIdBack=2;
	private final int menuIdLogin=3;
	private final int menuIdDate=4;
	private final int menuIdTime=5;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Log.v(TAG,"start");
        
        textViewName=(TextView)this.findViewById(R.id.textViewName);
        textViewName.setTextColor(Color.BLUE);
        textViewName.setBackgroundColor(Color.WHITE);
        
        editTextName=(EditText)this.findViewById(R.id.editTextName);
        
        textViewAge=(TextView)this.findViewById(R.id.textViewAge);
        textViewAge.setTextColor(Color.BLUE);
        textViewAge.setBackgroundColor(Color.WHITE);
        
        editTextAge=(EditText)this.findViewById(R.id.editTextAge);
        
    }
    
    
    public boolean onCreateOptionsMenu(Menu menu) {//初始化Menu菜单选择项  
        super.onCreateOptionsMenu(menu);  
  
        //添加菜单项，比如：  
  
        menu.add(0, menuIdRegiste, 0, R.string.registe).setShortcut('1', 'r');//设置快捷键  
        menu.add(0, menuIdBack, 0, R.string.back).setShortcut('2', 'b');//设置快捷键  
        menu.add(0, menuIdLogin, 0, R.string.login).setShortcut('3', 'l');//设置快捷键  
        menu.add(0, menuIdDate, 0, R.string.date).setShortcut('4', 'd');//设置快捷键  
        menu.add(0, menuIdTime, 0, R.string.time).setShortcut('5', 't');//设置快捷键  
        
        //添加其他菜单项。。。。。。  
  
        return true;  
    }
    public boolean onPrepareOptionsMenu(Menu menu) {//  
        super.onPrepareOptionsMenu(menu);  
  
        //这里可以事先设置菜单的可见性，如果都可见，可以不设置  
  
        menu.findItem(menuIdRegiste).setVisible(true).setIcon(android.R.drawable.ic_menu_add);//设置菜单项可见性  
        menu.findItem(menuIdBack).setVisible(true).setIcon(android.R.drawable.ic_menu_save);//设置菜单项可见性  
        menu.findItem(menuIdLogin).setVisible(true).setIcon(android.R.drawable.ic_menu_camera);//设置菜单项可见性  
        menu.findItem(menuIdDate).setVisible(true).setIcon(android.R.drawable.ic_menu_compass);//设置菜单项可见性  
        menu.findItem(menuIdTime).setVisible(true).setIcon(R.drawable.icon);//设置菜单项可见性  
        return true;
    }
    
    public boolean onOptionsItemSelected(MenuItem item) {//选择了一个菜单项的时候调用  
    	  
        //这里可以预先处理想要的变量  
        switch (item.getItemId()) {  
        case menuIdRegiste://一项一项的处理想要做的，不用我介绍了吧  
            Toast.makeText(this, R.string.menuIdRegisteContent, Toast.LENGTH_LONG).show();
            showDialog(DIALOG_KEY);
            return true;
        case menuIdBack:
        	Toast.makeText(this, R.string.menuIdBackContent, Toast.LENGTH_LONG).show();
        	showNotify();
        	return true;
        case menuIdLogin:
        	showDialog(DIALOG_LOGIN);
        	return true;
        case menuIdDate:
        	showDialog(DIALOG_DATE);
        	return true;
        case menuIdTime:
        	showDialog(DIALOG_TIME);
        	return true;
        }  
  
        return super.onOptionsItemSelected(item);  
    }  
    
    
    
    private static final int DIALOG_KEY = 0;
    private static final int DIALOG_LOGIN = 3;
    private static final int DIALOG_DATE = 4;
    private static final int DIALOG_TIME = 5;
    @Override
	protected Dialog onCreateDialog(int id) {
		switch (id) {
		case DIALOG_KEY:
			ProgressDialog progressDialog = new ProgressDialog(this);
			progressDialog.setTitle("通讯录");
			progressDialog.setMessage("获取通讯录中...请稍候");
			progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
			progressDialog.setIndeterminate(true);//不明确
			progressDialog.setCancelable(true);//是否可以按退回按键取消
			progressDialog.setButton("确定", new DialogInterface.OnClickListener() {
				
				@Override
				public void onClick(DialogInterface dialog, int which) {
					// TODO Auto-generated method stub
					dialog.cancel();
//					removeDialog(DIALOG_KEY);
				}
			});
			progressDialog.setCanceledOnTouchOutside(true);
			return progressDialog;
			case DIALOG_LOGIN:
				View dialogview=LayoutInflater.from(this).inflate(R.layout.main, null);
				
				Dialog loginDialog=new AlertDialog.Builder(this)
				.setTitle("登录")
				.setView(dialogview)//this.findViewById(R.layout.main),不可以，why？
				.setCancelable(true)
				.setPositiveButton("确定", new DialogInterface.OnClickListener() {
					
					@Override
					public void onClick(DialogInterface dialog, int which) {
						// TODO Auto-generated method stub
						dialog.cancel();
					}
				})
				.setNegativeButton("取消", new DialogInterface.OnClickListener() {
					
					@Override
					public void onClick(DialogInterface dialog, int which) {
						// TODO Auto-generated method stub
						dialog.cancel();
					}
				})
				.create();
				loginDialog.setCanceledOnTouchOutside(true);
				return loginDialog;
			case DIALOG_DATE:
				Calendar c = Calendar.getInstance();
				DatePickerDialog dateDialog=new DatePickerDialog(this,new DatePickerDialog.OnDateSetListener(){
					@Override
					public void onDateSet(DatePicker view, int year,
							int monthOfYear, int dayOfMonth) {
						// TODO Auto-generated method stub
						showDialog(DIALOG_KEY);
					}
					
				},c.get(Calendar.YEAR), c.get(Calendar.MONTH), c.get(Calendar.DATE));
				return dateDialog;
			case DIALOG_TIME:
				Calendar c2 = Calendar.getInstance();  
				TimePickerDialog timeDialog=new TimePickerDialog(this, new TimePickerDialog.OnTimeSetListener() {  
	                @Override  
	                public void onTimeSet(TimePicker view, int hourOfDay, int minute) {  
	                	showDialog(DIALOG_KEY);
	                }

	  
	            }, c2.get(Calendar.HOUR), c2.get(Calendar.MINUTE), true);  
				return timeDialog;
				
		}
		return null;
	}
    
    private void showNotify(){
    	Notification notice=new Notification();
    	notice.icon=R.drawable.icon;
    	notice.tickerText="您有一条新的信息";
    	notice.defaults=Notification.DEFAULT_SOUND;
    	notice.when=10L;
    	// 100 毫秒延迟后，震动 250 毫秒，暂停 100 毫秒后，再震动 500 毫秒  
//    	notice.vibrate = new long[] { 100, 250, 100, 500 };  
    	notice.setLatestEventInfo(this, "通知", "开会啦", PendingIntent.getActivity(this, 0, null, 0));
    	NotificationManager manager=(NotificationManager)getSystemService(this.NOTIFICATION_SERVICE);
    	manager.notify(0,notice);
    }
}