Android中常用的函数

//安装apk文件

private void installAPK(File file) {
Intent intent = new Intent(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 = new Intent(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(Bitmap sourceBitmap,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;
return Bitmap.createBitmap(sourceBitmap, x, y, resetWidth, resetHeight);
}

来源：(http://blog.sina.com.cn/s/blog_3f7f41d40100ipha.html ) - Android中常用的函数_挑戰者_新浪博客

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