Android常用到得方法积累

//安装apk文件

private void installAPK(File file) {
Intent intent = newIntent(Intent.ACTION_VIEW); Uri data =Uri.fromFile(file); String type ="application/vnd.android.package-archive"; intent.setDataAndType(data,type); startActivity(intent); }

//卸载apk文件

private void uninstallAPK(String packageName){ Intent intent = newIntent(Intent.ACTION_VIEW); Uri data = Uri.parse("package:"+ packageName); intent.setData(data); startActivity(intent); }

//编辑图片大小，保持图片不变形。 public static Bitmap resetImage(BitmapsourceBitmap,int resetWidth,int resetHeight){ int width =sourceBitmap.getWidth(); int height =sourceBitmap.getHeight(); int tmpWidth; int tmpHeight; float scaleWidth =(float)resetWidth / (float)width; float scaleHeight =(float)resetHeight / (float)height; float maxTmpScale = scaleWidth>= scaleHeight ? scaleWidth : scaleHeight; //保持不变形 tmpWidth = (int)(maxTmpScale *width); tmpHeight = (int)(maxTmpScale *height); Matrix m = new Matrix(); m.setScale(maxTmpScale,maxTmpScale, tmpWidth, tmpHeight); sourceBitmap =Bitmap.createBitmap(sourceBitmap, 0, 0, sourceBitmap.getWidth(),sourceBitmap.getHeight(), m, false); //切图 int x = (tmpWidth -resetWidth)/2; int y = (tmpHeight -resetHeight)/2; returnBitmap.createBitmap(sourceBitmap, x, y, resetWidth,resetHeight); }

//从SIM卡中获取联系人

private Cursor getContacts() {
Uri uri = Uri.parse("content://sim/adn");
String[] projection = new String[] { "name", "phone" };
String selection = null;
String[] selectionArgs = null;
String sortOrder = null;
return managedQuery(uri, projection, selection, selectionArgs,sortOrder);
}

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