Android实用编程技巧代码总结

Bitmap buffer = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_4444);buffer.eraseColor(Color.TRANSPARENT);

Intent intent = new Intent(Intent.ACTION_SENDTO, Uri .fromParts("mailto", "test@test.com", null));intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);context.startActivity(intent);

WindowManager.LayoutParams lp = getWindow().getAttributes();lp.screenBrightness = 100 / 100.0f;getWindow().setAttributes(lp);

Filter filter = myAdapter.getFilter();filter.filter(mySearchText);

setOnScrollListener(new OnScrollListener(){public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {// TODO Auto-generated method stub  }public void onScrollStateChanged(AbsListView view, int scrollState) {// TODO Auto-generated method stubif(scrollState == 0) Log.i("a", "scrolling stopped...");  } });}

Bitmap bmp = getImageBitmap(jpg);String path = getFilesDir().getAbsolutePath() + "/test.png";File file = new File(path);FileOutputStream fos = new FileOutputStream(file);bmp.compress( CompressFormat.PNG, 100, fos ); fos.close();  Intent intent = new Intent();  intent.setAction(android .content.Intent.ACTION_VIEW);  intent.setDataAndType(Uri .fromFile(new File(path)), "image/png");  startActivity(intent);

Intent intent = new Intent();intent.setAction(android .content.Intent.ACTION_VIEW);File file = new File("/sdcard/test.mp4");intent.setDataAndType(Uri .fromFile(file), "video/*");startActivity(intent);Intent intent = new Intent();intent.setAction(android .content.Intent.ACTION_VIEW);File file = new File("/sdcard/test.mp3");intent.setDataAndType(Uri .fromFile(file), "audio/*");startActivity(intent);

setTextAppearance(context, android .R.style.TextAppearance_Medium);android :textAppearance="?android :attr/textAppearanceMedium"

<activity android :name=".ArtistActivity" android :label="Artist" android :launchMode="singleTop"></activity>

Intent i = new Intent();i.putExtra(EXTRA_KEY_ARTIST, id);i.setClass(this, ArtistActivity.class);i.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);startActivity(i);

Bitmap myCoolBitmap = ... ;   int w = myCoolBitmap.getWidth(), h = myCoolBitmap.getHeight();   Bitmap rounder = Bitmap.createBitmap(w,h,Bitmap.Config.ARGB_8888);   Canvas canvas = new Canvas(rounder);   Paint xferPaint = new Paint(Paint.ANTI_ALIAS_FLAG);   xferPaint.setColor(Color.RED);   canvas.drawRoundRect(new RectF(0,0,w,h), 20.0f, 20.0f, xferPaint);   xferPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));//然后呢实现canvas.drawBitmap(myCoolBitmap, 0,0, null);canvas.drawBitmap(rounder, 0, 0, xferPaint);

Notification notification = new Notification (icon, tickerText, when);notification .number = 4;

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android ="http://schemas.android .com/apk/res/android " android :shape="rectangle">  <gradient android :startColor="#FFFFFFFF" android :endColor="#FFFF0000"      android :angle="270"/></shape>

<?xml version="1.0" encoding="utf-8"?><resources><style name="NewTheme" parent="android :Theme"><item name="android :background">@drawable/shape</item></style></resources>

<activity android :name=".ShapeDemo" android :theme="@style/NewTheme">

<?php xml version="1.0" ?>?<response><error>1</error><message>Invalid URL.</message></response>

public class MyApplication extends Application{  private String thing = null;  public String getThing(){   return thing;  }  public void setThing( String thing ){   this.thing = thing;  }}public class MyActivity extends Activity {   private MyApplication app;   public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     app = ((MyApplication)getApplication());     String thing = app.getThing();   }}