java - 执行脚本之前等待 AsyncTask 完成

Question

package com.cydeon.plasmamodz;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;

import com.cydeon.plasmamodz.R;

import android.app.ActionBar;
import android.app.Activity;
import android.app.DownloadManager;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

//Class for Boot Animation Blue Kindle
public class Boots extends Activity {

public static String TAG = "Boots";
Process process;

private class DownloadFile extends AsyncTask<String, Integer, String>{
    @Override
    protected String doInBackground(String... sURL) {
        try{
            URL url = new URL(sURL[0]);
            URLConnection connection = url.openConnection();
            connection.connect();
            //Shows 0-100% progress bar
            int fileLength = connection.getContentLength();

            //Download the file
            InputStream input = new BufferedInputStream(url.openStream());
            OutputStream output = new FileOutputStream("/sdcard/TWRP-Blaze-2.4.3.0-1.zip");

            byte data[] = new byte[1024];
            long total = 0;
            int count;
            while ((count = input.read(data)) != -1) {
                total += count;
                //Publish the Progress
                publishProgress((int) (total * 100/fileLength));
                output.write(data, 0, count);
                }

            output.flush();
            output.close();
            input.close();
    } catch (Exception e) {

    }
    return null;
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        mProgressDialog.show();
    }

    @Override
    protected void onProgressUpdate(Integer... progress){
        super.onProgressUpdate(progress);
        mProgressDialog.setProgress(progress[0]);



    }

    @Override
    protected void onPostExecute(String result) {
        // TODO Auto-generated method stub
        super.onPostExecute(result);
        mProgressDialog.dismiss();
        Context context = getApplicationContext();
        CharSequence text = "Installing. Please Wait";
        int duration = Toast.LENGTH_SHORT;

        Toast toast = Toast.makeText(context, text, duration);
        toast.show();

        try {
                Runtime rt = Runtime.getRuntime();
                Process proc = rt.exec("su");

                proc = rt.exec("sh /sdcard/boots.sh");
                InputStream is = proc.getInputStream();
                InputStreamReader isr = new InputStreamReader(is);
                BufferedReader br = new BufferedReader(isr);
                String line;

                while ((line = br.readLine()) != null){
                    System.out.println(line);
                }
        }catch (Throwable t){
            t.printStackTrace();
        }

    }
}

ProgressDialog mProgressDialog;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.boots);
    ActionBar actionBar = getActionBar();
    actionBar.hide();
    ImageView img = (ImageView) findViewById(R.id.iv2);
    img.setImageResource(R.drawable.boot1);
    Button install = (Button) findViewById(R.id.bAInstall);
    Button rtrn = (Button) findViewById(R.id.bAReturn);
    mProgressDialog = new ProgressDialog(Boots.this);
    mProgressDialog.setMessage("Downloading..." );
    mProgressDialog.setIndeterminate(false);
    mProgressDialog.setMax(100);
    mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

    install.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
            DownloadFile downloadFile = new DownloadFile();
            downloadFile.execute("https://dl.dropbox.com/s/t16a0cq0qcon2ux/TWRP-Blaze-2.4.3.0-1.zip");



            }

        }
    );

    rtrn.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
            finish();
        }
    });

    }



   }

抱歉，如果我搜索得不够好。我带着我的代码，所以我会发布它。另外，正如您可能看到的，我不知道如何在我的应用程序中包含脚本然后运行它。我尝试创建一个新文件夹并将脚本放入其中，但它不起作用。对此的帮助也将不胜感激......

编辑:我让第一部分开始工作。现在我无法执行该脚本。 su 被执行，但我的脚本没有被执行。我还需要知道将脚本放在应用程序中的何处，然后运行该脚本。我不确定安装应用程序时脚本将在哪里。而且我不知道该把脚本放在哪里。因此，我们将不胜感激。下面(我猜是上面现在。哈哈)是更新后的代码:

Answer 1

您拥有可用于执行后指令的 onPostExecute 方法。他的参数取决于您在 AsyncTask 定义中指定的输出内容。

为了使用输出，您需要在 doInBackground 方法中返回一些内容。一个好的做法是在使用之前检查此输出是否为空。应该可以了 =)