java - 简单的进度对话框 onClick 并在完成操作时隐藏

Question

我想在单击按钮时显示一个进度对话框(带有进度条或圆圈，这对我来说无关紧要)。其实我可以显示它，但我不知道如何在 onclick 完成内部操作后隐藏它。这是代码:

copy.setOnClickListener(new OnClickListener() {         
            public void onClick(View v){

                                ProgressDialog progressDialog = new ProgressDialog(getActivity());
                                progressDialog.setProgressStyle(R.style.NewDialog);
                                progressDialog.setMessage("Loading...");
                                progressDialog.show(); 
                                String datafolder = Environment.getDataDirectory().getAbsolutePath()+File.separator+"app";
                                File customfolder=new File(Environment.getExternalStorageDirectory().getAbsolutePath().toString()+File.separator+"BackupApps");
                                String comando = "cp -r /data/app /sdcard/BackupApps";
                                Process suProcess = null;
                                try {
                                    suProcess = Runtime.getRuntime().exec("su");
                                } catch (IOException e3) {
                                    // TODO Auto-generated catch block
                                    e3.printStackTrace();
                                }
                                DataOutputStream os = new DataOutputStream(suProcess.getOutputStream());

                                try {

                                    os.writeBytes(comando + "\n");

                                } catch (IOException e2) {
                                    // TODO Auto-generated catch block
                                    e2.printStackTrace();

                                }
                                try {
                                    os.flush();
                                } catch (IOException e1) {
                                    // TODO Auto-generated catch block
                                    e1.printStackTrace();
                                }
                                try {
                                    os.writeBytes("exit\n");

                                } catch (IOException e1) {
                                    // TODO Auto-generated catch block
                                    e1.printStackTrace();
                                }
                                try {
                                    os.flush();

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

                                }   

                            }


        });

我该怎么做？

Answer 1

首先在你的类中这样定义内部类

    class SaveTask extends AsyncTask<Void, Void, Void> {

    ProgressDialog progressDialog;

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        progressDialog = new ProgressDialog(getActivity());
        progressDialog.setProgressStyle(R.style.NewDialog);
        progressDialog.setMessage("Loading...");
        progressDialog.show();
    }

    @Override
    protected Void doInBackground(Void... params) {
        String datafolder = Environment.getDataDirectory()
                .getAbsolutePath() + File.separator + "app";
        File customfolder = new File(Environment
                .getExternalStorageDirectory().getAbsolutePath().toString()
                + File.separator + "BackupApps");
        String comando = "cp -r /data/app /sdcard/BackupApps";
        Process suProcess = null;
        try {
            suProcess = Runtime.getRuntime().exec("su");
        } catch (IOException e3) {
            // TODO Auto-generated catch block
            e3.printStackTrace();
        }
        DataOutputStream os = new DataOutputStream(
                suProcess.getOutputStream());

        try {

            os.writeBytes(comando + "\n");

        } catch (IOException e2) {
            // TODO Auto-generated catch block
            e2.printStackTrace();

        }
        try {
            os.flush();
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        try {
            os.writeBytes("exit\n");

        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        try {
            os.flush();

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

        }
        return null;
    }

    @Override
    protected void onPostExecute(Void result) {
        super.onPostExecute(result);
        if (progressDialog != null) {
            if (progressDialog.isShowing()) {
                progressDialog.dismiss();
            }
        }
    }

}

像这样在你的 onClick() 中调用它..这里我们没有向 AsynchTask 传递任何数据，所以这里我传递 null

copy.setOnClickListener(new OnClickListener() {         
            public void onClick(View v){
    SaveTask task = new SaveTask();
    task.execute(null, null, null);
}