从线程启动活动 [英] Start an activity from the thread

问题描述

我有一个生成的PDF文件的类。
这个类是通过活动，这意味着是具有的onCreate，在onPause（依此类推）的方法延长。

在一个PDF文件生成它需要生成，所以我需要显示一个进度条，通知该文件是在瞬间生成用户一段时间。

一切正常期望，当我点击一个按钮，生成进度条冻结几秒钟（根据LogCat中：在文件生成的进度条冻结）。

所以我的问题是，我不知道该怎么做，而该文件生成进度条不可阻挡的。

下面是我的code：

  Log.i（TAG，PDF生成：+位置）;最后ProgressDialog对话框=新ProgressDialog（本）;
dialog.setCancelable（真）;
dialog.setIndeterminate（真）;
dialog.setMessage（生成...）;
dialog.show（）;新主题（新的Runnable接口（）{    @覆盖
    公共无效的run（）{        startActivity（新意图（getApplicationContext（）
            PdfGenerator.class））;        runOnUiThread（新的Runnable（）{            @覆盖
            公共无效的run（）{
                dialog.hide（）;
            }
        }）;    }}）。开始（）;
 

解决方案

更改code作为启动使用runOnUiThread从主题活动：

  /// ...您的code在这里..    新主题（新的Runnable接口（）{        @覆盖
        公共无效的run（）{            Your_Current_Activity.this.runOnUiThread（新的Runnable（）{                @覆盖
                公共无效的run（）{                dialog.cancel（）;                //此处Start活动
               Your_Current_Activity.this.startActivity（新
                        意图（Your_Current_Activity.this，
                                       PdfGenerator.class））;                }
            }）;        }    }）。开始（）;
 

I have a class which generates a pdf file. This class is extended by Activity that means is have onCreate, onPause (and so on) methods.

While a pdf file is generating it takes some time to be generated so I need to show a progress bar to notify the user that the file is generating at the moment.

Everything works fine expect that when I click on a generate button the progress bar freezes for a few seconds (according to Logcat: progress bar freezing while file is generating).

So my problem is that, that I don't know how to make the progress bar unstoppable while the file is generating.

Below is my code:

Log.i(TAG, "PDF generation: " + position);

final ProgressDialog dialog = new ProgressDialog(this);
dialog.setCancelable(true);
dialog.setIndeterminate(true);
dialog.setMessage("Generating...");
dialog.show();

new Thread(new Runnable() {

    @Override
    public void run() {

        startActivity(new Intent(getApplicationContext(),
            PdfGenerator.class));

        runOnUiThread(new Runnable() {

            @Override
            public void run() {
                dialog.hide();
            }
        });

    }

}).start();

解决方案

Change your code as for starting an Activity from Thread using runOnUiThread:

///... your code here..

    new Thread(new Runnable() {

        @Override
        public void run() {

            Your_Current_Activity.this.runOnUiThread(new Runnable() {

                @Override
                public void run() {

                dialog.cancel();

                // START ACTIVITY HERE
               Your_Current_Activity.this.startActivity(new 
                        Intent(Your_Current_Activity.this,
                                       PdfGenerator.class));

                }
            });

        }

    }).start();

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