小技巧

1、RelativeLayout标签和ListView组合实现ListView的页眉页脚

<?xml version="1.0" encoding="utf-8"?>

02	<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

03	android:orientation="vertical" android:layout_width="fill_parent"

04	android:layout_height="fill_parent">

05	<RelativeLayout android:id="@+id/listHeader"

06	android:background="@drawable/jbshape" android:layout_alignParentTop="true"

07	android:gravity="center_horizontal" android:layout_width="fill_parent"

08	android:layout_height="wrap_content">

09	<TextView android:text="IdeasAndroid 列表演示" android:textColor="#000000"

10	android:textSize="18dip" android:layout_width="wrap_content"

11	android:layout_height="wrap_content"></TextView>

12	</RelativeLayout>

13	<RelativeLayout android:id="@+id/listFooter"

14	android:background="@drawable/jbshape" android:gravity="center_horizontal"

15	android:layout_alignParentBottom="true" android:layout_width="fill_parent"

16	android:layout_height="wrap_content">

17	<Button android:id="@+id/prePage" android:layout_width="wrap_content"

18	android:layout_height="wrap_content" android:text="上一页"

19	android:layout_alignParentLeft="true"></Button>

20	<Button android:layout_width="wrap_content"

21	android:layout_gravity="right" android:layout_height="wrap_content"

22	android:text="下一页" android:layout_toRightOf="@id/prePage"></Button>

23	</RelativeLayout>

24	<ListView android:id="@+id/myListView" android:layout_width="fill_parent"

25	android:layout_height="fill_parent" android:layout_below="@id/listHeader"

26	android:layout_above="@id/listFooter">

27	</ListView>

28	</RelativeLayout>

 

参考文章： http://www.oschina.net/code/snippet_4873_1593

 

2、Android 添加新的联系人

 

01 private Uri insertContact(Context context, String name, String phone) {
02
03        ContentValues values = new ContentValues();
04        values.put(People.NAME, name);
05        Uri uri = getContentResolver().insert(People.CONTENT_URI, values);
06        Uri numberUri = Uri.withAppendedPath(uri, People.Phones.CONTENT_DIRECTORY);
07        values.clear();
08
09        values.put(Contacts.Phones.TYPE, People.Phones.TYPE_MOBILE);
10        values.put(People.NUMBER, phone);
11        getContentResolver().insert(numberUri, values);
12
13        return uri;
14 }
3、Android 编程设置 APN
ContentValues values = new ContentValues(); 02 values.put(NAME, "CMCC cmwap"); 03 values.put(APN, "cmwap"); 04 values.put(PROXY, "10.0.0.172"); 05    06 values.put(PORT, "80"); 07 values.put(MMSPROXY, ""); 08 values.put(MMSPORT, ""); 09 values.put(USER, ""); 10 values.put(SERVER, ""); 11 values.put(PASSWORD, ""); 12 values.put(MMSC, "");          13 values.put(TYPE, ""); 14 values.put(MCC, "460"); 15 values.put(MNC, "00"); 16 values.put(NUMERIC, "46000"); 17 reURI = getContentResolver().insert(Uri.parse("content://telephony/carriers"), values); 18    19    20 //首选接入点"content://telephony/carriers/preferapn" 4、 android把view的画面转换为bitmap 程序如何把自身进行一次截图？或者对某个view对象截图？ ImageView iv = (ImageView) findViewById(R.id.ImageView01); ImageView iv2 = (ImageView) findViewById(R.id.ImageView02); ImageView iv3 = (ImageView) findViewById(R.id.ImageView03); //draw的方式对整屏截取，但信息栏为黑色 View cv = getWindow().getDecorView();   Bitmap b = Bitmap.createBitmap(200, 200, Bitmap.Config.RGB_565);   cv.draw(new Canvas(b)); iv.setImageBitmap(b); //对隐藏的未画过的对象，截出的是黑色 Bitmap image = Bitmap.createBitmap(200, 200, Bitmap.Config.RGB_565); bt3.draw(new Canvas(image)); iv2.setImageBitmap(image); //get drawable cache , bitmap to drawable bt4.setDrawingCacheEnabled(true); Bitmap bitmap = bt4.getDrawingCache(); Drawable drawable = (Drawable) new BitmapDrawable(bitmap); iv3.setBackgroundDrawable(drawable); 参考： http://www.aslibra.com/blog/post/android-view-to-bitmap.php 5、Andrioid 多点触摸 event.getAction() //获取触控动作比如ACTION_DOWN event.getPointerCount(); //获取触控点的数量，比如2则可能是两个手指同时按压屏幕 event.getPointerId(nID); //对于每个触控的点的细节，我们可以通过一个循环执行getPointerId方法获取索引 event.getX(nID); //获取第nID个触控点的x位置 event.getY(nID); //获取第nID个点触控的y位置 event.getPressure(nID); //LCD可以感应出用户的手指压力，当然具体的级别由驱动和物理硬件决定的 event.getDownTime() //按下开始时间 event.getEventTime() // 事件结束时间 event.getEventTime()-event.getDownTime()); //总共按下时花费时间 参考文章： http://www.oschina.net/code/snippet_12_169 6、Android通过手势实现的缩放处理 import android.app.Activity; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.os.Bundle; import android.util.DisplayMetrics; import android.view.MotionEvent; import android.view.View; /**  * ...  *  * @author vlinux  *  */ public class MultiTouchTestActivity extends Activity {  /** Called when the activity is first created. */  @Override  public void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   // setContentView(R.layout.main);   View view = new MultiTouchView(this);   setContentView(view);  }  class MultiTouchView extends View {   private float x1;   private float y1;   private float x2;   private float y2;   public MultiTouchView(Context context) {    super(context);    // TODO Auto-generated constructor stub   }   @Override   public boolean onTouchEvent(MotionEvent event) {    // TODO Auto-generated method stub    float size = event.getSize();    int szi = (int) size;    int dxi = szi >> 12;    int dyit = ((1 << 12) - 1);    int dyi = szi & dyit;    DisplayMetrics metrics = getResources().getDisplayMetrics();    float dx = metrics.widthPixels * dxi / (float) dyit;    float dy = metrics.heightPixels * dyi / (float) dyit;    x1 = event.getX();    y1 = event.getY();    x2 = x1 + dx;    y2 = y1 + dy;    invalidate();    return true;   }   @Override   protected void onDraw(Canvas canvas) {    // TODO Auto-generated method stub    super.onDraw(canvas);    float r = (float) Math.sqrt((x1 - x2) * (x1 - x2) + (y1 - y2)      * (y1 - y2)) / 2;    r = 50 >= r ? 50 : r;    Paint paint = new Paint();    paint.setColor(Color.BLUE);    canvas.drawCircle(x1, y1, r, paint);   }  } } 参考文章： http://www.oschina.net/code/snippet_16_2735#comments
02 values.put(NAME, "CMCC cmwap");
03 values.put(APN, "cmwap");
04 values.put(PROXY, "10.0.0.172");
05
06 values.put(PORT, "80");
07 values.put(MMSPROXY, "");
08 values.put(MMSPORT, "");
09 values.put(USER, "");
10 values.put(SERVER, "");
11 values.put(PASSWORD, "");
12 values.put(MMSC, "");
13 values.put(TYPE, "");
14 values.put(MCC, "460");
15 values.put(MNC, "00");
16 values.put(NUMERIC, "46000");
17 reURI = getContentResolver().insert(Uri.parse("content://telephony/carriers"), values);
18
19
20 //首选接入点"content://telephony/carriers/preferapn"
4、 android把view的画面转换为bitmap
程序如何把自身进行一次截图？或者对某个view对象截图？ ImageView iv = (ImageView) findViewById(R.id.ImageView01); ImageView iv2 = (ImageView) findViewById(R.id.ImageView02); ImageView iv3 = (ImageView) findViewById(R.id.ImageView03); //draw的方式对整屏截取，但信息栏为黑色 View cv = getWindow().getDecorView();   Bitmap b = Bitmap.createBitmap(200, 200, Bitmap.Config.RGB_565);   cv.draw(new Canvas(b)); iv.setImageBitmap(b); //对隐藏的未画过的对象，截出的是黑色 Bitmap image = Bitmap.createBitmap(200, 200, Bitmap.Config.RGB_565); bt3.draw(new Canvas(image)); iv2.setImageBitmap(image); //get drawable cache , bitmap to drawable bt4.setDrawingCacheEnabled(true); Bitmap bitmap = bt4.getDrawingCache(); Drawable drawable = (Drawable) new BitmapDrawable(bitmap); iv3.setBackgroundDrawable(drawable); 参考： http://www.aslibra.com/blog/post/android-view-to-bitmap.php
5、Andrioid 多点触摸
event.getAction() //获取触控动作比如ACTION_DOWN event.getPointerCount(); //获取触控点的数量，比如2则可能是两个手指同时按压屏幕 event.getPointerId(nID); //对于每个触控的点的细节，我们可以通过一个循环执行getPointerId方法获取索引 event.getX(nID); //获取第nID个触控点的x位置
event.getY(nID); //获取第nID个点触控的y位置 event.getPressure(nID); //LCD可以感应出用户的手指压力，当然具体的级别由驱动和物理硬件决定的 event.getDownTime() //按下开始时间 event.getEventTime() // 事件结束时间 event.getEventTime()-event.getDownTime()); //总共按下时花费时间
参考文章： http://www.oschina.net/code/snippet_12_169
6、Android通过手势实现的缩放处理
import android.app.Activity; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.os.Bundle; import android.util.DisplayMetrics; import android.view.MotionEvent; import android.view.View;
/**  * ...  *  * @author vlinux  *  */ public class MultiTouchTestActivity extends Activity {  /** Called when the activity is first created. */  @Override  public void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   // setContentView(R.layout.main);   View view = new MultiTouchView(this);   setContentView(view);  }
 class MultiTouchView extends View {
  private float x1;   private float y1;   private float x2;   private float y2;
  public MultiTouchView(Context context) {    super(context);    // TODO Auto-generated constructor stub   }
  @Override   public boolean onTouchEvent(MotionEvent event) {    // TODO Auto-generated method stub
   float size = event.getSize();
   int szi = (int) size;    int dxi = szi >> 12;    int dyit = ((1 << 12) - 1);    int dyi = szi & dyit;
   DisplayMetrics metrics = getResources().getDisplayMetrics();    float dx = metrics.widthPixels * dxi / (float) dyit;    float dy = metrics.heightPixels * dyi / (float) dyit;
   x1 = event.getX();    y1 = event.getY();
   x2 = x1 + dx;    y2 = y1 + dy;
   invalidate();
   return true;   }
  @Override   protected void onDraw(Canvas canvas) {    // TODO Auto-generated method stub    super.onDraw(canvas);
   float r = (float) Math.sqrt((x1 - x2) * (x1 - x2) + (y1 - y2)      * (y1 - y2)) / 2;    r = 50 >= r ? 50 : r;
   Paint paint = new Paint();    paint.setColor(Color.BLUE);    canvas.drawCircle(x1, y1, r, paint);
  }
 }
}
参考文章： http://www.oschina.net/code/snippet_16_2735#comments