Android 下載進度對話框 ProgressDialog

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                ProgressDialog dialog = new ProgressDialog(MainActivity.this);
                dialog.setTitle("下載提示");
                dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
                dialog.setProgress(50);
                dialog.show();
            }
        });
    }