Android程序安裝和卸載

安裝：

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);

 

 

卸載：

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

 

Environment擁有一些可以獲取環境變量的方法

package:com.demo.CanavaCancel 這個形式是 package:程序完整的路徑 (包名+程序名).

 

//下載apk程序代碼

protected File downLoadFile(String httpUrl) {
                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, "連接超時", 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) {

                                e.printStackTrace();
                        }
                } catch (MalformedURLException e) {
                        e.printStackTrace();
                }

                return file;
        }

//打開APK程序代碼

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);
        }

 

備註說明：

Android系統的應用安裝，在系統設置裏面有一項，是否安裝未知源，所在在軟件更新的時候，需要檢測這個選項，如果打鉤，則只允許安裝Market源提供的安裝程序，如果沒有打鉤的話，系統安裝應用時會提示用戶設置，如果選擇設置，設置好後，無法返回安裝界面；如果選擇取消，則推出安裝程序。所以，如果是更新的話，一定要在下載之前就檢測許可安裝源的設置，或者在下載前檢測是否已經下載過新的安裝程序，避免重複下載安裝程序。

相關的代碼如下

int result = Settings.Secure.getInt(getContentResolver(), Settings.Secure.INSTALL_NON_MARKET_APPS, 0);     

if (result == 0) {     

// show some dialog here     

// ...     

// and may be show application settings dialog manually     

Intent intent = new Intent();     

intent.setAction(Settings.ACTION_APPLICATION_SETTINGS);     

startActivity(intent);    

}