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("下载提示"); dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); dialog.setProgress(50); dialog.show(); } }); }