Android常用到得方法积累

//安装apk文件

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

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//卸载apk文件

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

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

//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);
}