Android:從assets資源目錄下安裝apk

原文鏈接：http://blog.csdn.net/annkie/article/details/8150807

爲了實現將第三方apk內置在assets資源目錄下，再進行安裝的目的。

首先將需要安裝的apk複製到assets目錄下，後綴名改爲.mp3或其他免壓縮的格式。

測試代碼如下：

public class MainActivity extends Activity
{
    private static final String TAG = "ExtractIconFromApk";

    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        AssetManager assets = getAssets();
        try
        {
            //獲取assets資源目錄下的himarket.mp3,實際上是himarket.apk,爲了避免被編譯壓縮，修改後綴名。
            InputStream stream = assets.open("himarket.mp3");
            if(stream==null)
            {
                Log.v(TAG,"no file");
                return;
            }

            String folder = "/mnt/sdcard/sm/";
            File f=new File(folder);
            if(!f.exists())
            {
                f.mkdir();
            }
            String apkPath = "/mnt/sdcard/sm/test.apk";
            File file = new File(apkPath);
            //創建apk文件
            file.createNewFile();
            //將資源中的文件重寫到sdcard中
            //<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
            writeStreamToFile(stream, file);
            //安裝apk
            //<uses-permission android:name="android.permission.INSTALL_PACKAGES" />
            installApk(apkPath);
        }
        catch (IOException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    private void writeStreamToFile(InputStream stream, File file)
    {
        try
        {
            //
            OutputStream output = null;
            try
            {
                output = new FileOutputStream(file);
            }
            catch (FileNotFoundException e1)
            {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }
            try
            {
                try
                {
                    final byte[] buffer = new byte[1024];
                    int read;

                    while ((read = stream.read(buffer)) != -1)
                        output.write(buffer, 0, read);

                    output.flush();
                }
                finally
                {
                    output.close();
                }
            }
            catch (Exception e)
            {
                e.printStackTrace();
            }
        }
        finally
        {
            try
            {
                stream.close();
            }
            catch (IOException e)
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

    private void installApk(String apkPath)
    {
        Log.v(TAG,apkPath);

        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.setDataAndType(Uri.fromFile(new File(apkPath)),
                "application/vnd.android.package-archive");
        startActivity(intent);
    }