安裝:

 <STRONG>String str = "/CanavaCancel.apk";
 String fileName = Environment.getExternalStorageDirectory() + str;
 Intent intent = new Intent(Intent.ACTION_VIEW);
 intent.setDataAndType(Uri.fromFile(new File(fileName)), "application/vnd.android.package-archive");
 startActivity(intent);</STRONG>

卸載:
 <STRONG>Uri packageURI = Uri.parse("package:com.demo.CanavaCancel");
 Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI);
 startActivity(uninstallIntent);</STRONG>

Environment擁有一些可以獲取環境變數的方法
package:com.demo.CanavaCancel 這個形式是 package:程式完整的路徑 (包名+程式名).
//下載apk程式碼


<STRONG>protected File downLoadFile(String HTTPUrl) {
// TODO Auto-generated method stub
final String fileName = "updata.apk";
File tmpFile = new File("/sdcard/update");
if (!tmpFile.exists()) {
tmpFile.mkdir();
}
final File file = new File("/sdcard/update/" + fileName);

try {
URL url = new URL(HTTPUrl);
try {
HttpURLConnection conn = (HttpURLConnection) url
.openConnection();
InputStream is = conn.getInputStream();
FileOutputStream fos = new FileOutputStream(file);
byte[] buf = new byte[256];
conn.connect();
double count = 0;
if (conn.getResponseCode() >= 400) {
Toast.makeText(Main.this, "連接逾時", Toast.LENGTH_SHORT)
.show();
} else {
while (count <= 100) {
if (is != null) {
int numRead = is.read(buf);
if (numRead <= 0) {
break;
} else {
fos.write(buf, 0, numRead);
}

} else {
break;
}

}
}

conn.disconnect();
fos.close();
is.close();
} catch (IOException e) {
// TODO Auto-generated catch block

e.printStackTrace();
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block

e.printStackTrace();
}

return file;
}
//打開APK程式碼

private void openFile(File file) {
// TODO Auto-generated method stub
Log.e("OpenFile", file.getName());
Intent intent = new Intent();
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setAction(android.content.Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file),
"application/vnd.android.package-archive");
startActivity(intent);
}

</STRONG>
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