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复制文件后显示Android Toast消息_Android_Toast - Fatal编程技术网

复制文件后显示Android Toast消息

复制文件后显示Android Toast消息,android,toast,Android,Toast,我对安卓系统的开发相当陌生,所以我想我应该从一个基本的应用程序开始。当按下按钮时,它会将文件复制到代码中写入的位置(请参见下面的“我的代码”)。当我按下安装按钮并将文件复制到其位置时,我希望toast消息显示“成功安装或复制文件时出错”。我将如何实现这一点 public class TrialActivity extends Activity { private ProgressDialog progressDialog; /** Called when the activit

我对安卓系统的开发相当陌生,所以我想我应该从一个基本的应用程序开始。当按下按钮时,它会将文件复制到代码中写入的位置(请参见下面的“我的代码”)。当我按下安装按钮并将文件复制到其位置时,我希望toast消息显示“成功安装或复制文件时出错”。我将如何实现这一点

public class TrialActivity extends Activity {

    private ProgressDialog progressDialog;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);


        runDialog(5);
    }

    private void runDialog(final int seconds)
        {
            progressDialog = ProgressDialog.show(this, "Please Wait...", "unpacking patch in progress");

            new Thread(new Runnable(){
                    public void run(){
                        try {
                            Thread.sleep(seconds * 1000);
                            progressDialog.dismiss();
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                }).start();

            ((Button)findViewById(R.id.button1)).setOnClickListener(new View.OnClickListener()
                {
                    public void onClick(View paramView)
                        {

                        }

                        {

                            InputStream in = null;
                            OutputStream out = null;
                            String filename="savegame.bin";
                            try {

                                in = getResources().openRawResource(R.raw.savegame);
                                out = new FileOutputStream("/sdcard/Android/data/files/" + filename);
                                copyFile(in, out);
                                in.close();
                                in = null;
                                out.flush();
                                out.close();
                                out = null;
                            } catch(Exception e) {
                                Log.e("tag", e.getMessage());
                                Message message = Message.obtain();
                                message.what = 1;  // success message
                                mHandler.sendMessage(message);


                            }

                        }
                    private void copyFile(InputStream in, OutputStream out) throws IOException {
                        byte[] buffer = new byte[1024];
                        int read;
                        while((read = in.read(buffer)) != -1){
                            out.write(buffer, 0, read);

                        }
                    }
                }
                );
        }



    Handler mHandler = new Handler() {

            public void handleMessage( Message msg )
                {
                    Toast toast;
                    switch(msg.what)
                    {
                    case 1: // for success
                        toast = Toast.makeText(getBaseContext(), "Created By MRxBIGxSTUFF", Toast.LENGTH_SHORT);
                        toast.show();
                        break;
                    case 0: // for Error
                        toast = Toast.makeText(getBaseContext(), "Error... Application has shutdown", Toast.LENGTH_LONG);
                        toast.show();
                        break;
                    }
                }
        };
}

要展示烤面包,你必须自己制作并展示。像这样:

CharSequence text = "Hello toast!";
Toast.makeText(context, text, Toast.LENGTH_SHORT).show();
阅读更多关于祝酒的内容


当您硬编码
/sdcard/
时,您的代码出现错误,这是错误的。使用

我建议使用AsyncTask在后台运行进程。当复制文件变大时,不会冻结用户界面事件

您可以在加载操作时显示进度栏

public class CopyFiles extends AsyncTask<Void, Void, Void>
{  
@Override
protected void onPreExecute()
{  
    super.onPreExecute();
    dialog.setMessage("Please wait...");
    dialog.setCancelable(false);
    dialog.show();

} 
@Override 
protected void onProgressUpdate(Void... values) {
    super.onProgressUpdate(values);
    // Things to be done while execution of long running operation is in progress. For example updating ProgessDialog
 }

@Override 
protected void onPostExecute(Void result)

{ 
      //Post Execute
       dialog.cancel();
      //Use toast here to toast the message
      //Check condition toast message
      Toast.makeText(getBaseContext(), "Created By MRxBIGxSTUFF", Toast.LENGTH_SHORT);
}
@Override
protected Void doInBackground(Void... params) {

  // Your operation..Dont Edit Any Views here

    return null;
}
} 
public类CopyFiles扩展异步任务
{  
@凌驾
受保护的void onPreExecute()
{  
super.onPreExecute();
setMessage(“请稍候…”);
对话框。可设置可取消(false);
dialog.show();
} 
@凌驾
受保护的void onProgressUpdate(void…值){
super.onProgressUpdate(值);
//正在执行长时间运行的操作时要执行的操作。例如更新ProgessDialog
}
@凌驾
受保护的void onPostExecute(void结果)
{ 
//后执行
dialog.cancel();
//在这里使用toast来祝酒
//检查条件toast消息
Toast.makeText(getBaseContext(),“由MRxBIGxSTUFF创建”,Toast.LENGTH_SHORT);
}
@凌驾
受保护的Void doInBackground(Void…参数){
//您的操作..不要在此处编辑任何视图
返回null;
}
} 
我认为这是处理文件(即复制、下载等)的最佳方式之一


希望它能有所帮助

据我所知,您只是在出现异常情况时向处理程序发送一条消息。对不起,我的坏消息并不是要包含处理程序位,我在网上找到了一些不同的代码,但没有成功,我将使用什么代码来捕获文件是否已复制?@user1305471因此,您在使用代码时根本不了解它在做什么?它迟早会给你带来麻烦的。