開(kāi)發(fā)過(guò)程中肯定會(huì)遇到這樣的一個(gè)功能：點(diǎn)擊圖標(biāo)下載apk市袖，安裝后實(shí)現(xiàn)功能跳轉(zhuǎn)，現(xiàn)簡(jiǎn)單記錄一下烁涌，以防以后用上苍碟。

1、先判斷當(dāng)前手機(jī)或者平板有沒(méi)有安裝該apk

    /**
     * 判斷有沒(méi)有安裝該apk
     * @param packageName
     * @param context
     * @return
     */
    public static boolean isAvilible(String packageName,Context context) {
        final PackageManager packageManager = context.getPackageManager();
        // 獲取所有已安裝程序的包信息
        List<PackageInfo> pinfo = packageManager.getInstalledPackages(0);
        for (int i = 0; i < pinfo.size(); i++) {
            if (pinfo.get(i).packageName.equalsIgnoreCase(packageName))
                return true;
        }
        return false;
    }

2撮执、復(fù)制assert目錄下的apk到sd卡中（該方式實(shí)現(xiàn)的是：要下載的apk先放到assert目錄下）

/**
     * 復(fù)制assert目錄下的apk到sd卡中
     * @param context
     * @param apkName
     * @return
     */
    public static boolean copyApkFromAssets(Context context,String apkName) {
        String path = Environment.getExternalStorageDirectory().getAbsolutePath()+"/"+apkName;
        boolean copyIsFinish = false;
        try {
            InputStream is = context.getAssets().open(apkName);
            File file = new File(path);
            file.createNewFile();
            FileOutputStream fos = new FileOutputStream(file);
            byte[] temp = new byte[1024];
            int i = 0;
            while ((i = is.read(temp)) > 0) {
                fos.write(temp, 0, i);
            }
            fos.close();
            is.close();
            copyIsFinish = true;
        } catch (IOException e) {
            e.printStackTrace();
        }
        return copyIsFinish;
    }

3微峰、提示用戶是否要安裝

 /**
     * 彈窗提示用戶安裝與否
     * @param apkName
     */
    private void showInstallApkOrNo(final String apkName){
        if (AppUtils.copyApkFromAssets(getActivity(), apkName)) {
            Dialog builder = new AlertDialog.Builder(getActivity())
                    .setIcon(R.drawable.ic_launcher)
                    .setMessage("是否安裝？")
                    .setNegativeButton("取消", null)
                    .setPositiveButton("確定", new DialogInterface.OnClickListener() {

                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            Intent intent = new Intent(Intent.ACTION_VIEW);
                            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                            intent.setDataAndType(Uri.parse("file://" + Environment.getExternalStorageDirectory().getAbsolutePath()+"/"+apkName), "application/vnd.android.package-archive");
                            getActivity().startActivity(intent);
                        }
                    })
                    .create();
            builder.show();
        }
    }

4抒钱、實(shí)現(xiàn)功能跳轉(zhuǎn)

private void jumpToIntegrationFunction(int position){
        String apkName = "app-release.apk";
        String packageName = "com.tecsun.tsb.integration.hubei";
        String srcActivity = "com.tecsun.tsb.integration.hubei.activity.MainActivity";
        
        if ( !AppUtils.isAvilible( packageName , getActivity( ) ) ){
//          LogUtils.v( "com.tecsun.tsb.integration.hubei not installed" );
//          return;
            showInstallApkOrNo(apkName);
            return;
        }
        
        int type = -1;
        if ( position == 0 ) {
            type = TQ_APPLY;
        }
        if ( position == 11 ) {     
            type = TQ_INTRODUCE;
        }
        if ( type > 0 ) {
            Intent intent = new Intent( );
            srcActivity = packageName + ".activity.MainActivity";
            ComponentName componentName = new ComponentName( packageName ,
                    srcActivity );
            intent.setComponent( componentName );
            intent.putExtra( "type" , type );
            intent.putExtra( "TOKEN_ID" , AppApplication.TOKEN_ID );
            intent.setAction( srcActivity );
            getActivity( ).startActivity( intent );
            return;
        }
    }