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Activity.onKeyDown();當某個鍵被按下時會觸發，但不會被任何的該Activity內的任何view處理。默認按下KEYCODE_BACK鍵后會回到上一個Activity。Activity.onKeyUp():當某個按鍵被按下，松開后觸發，但不會被任何的該Activity內的任何view處理。默認沒有執行任何操作，只是簡單的給一個false作為返回值。在Android中是通過觸屏及鍵盤來操作程序的，我們如何響應一般的鍵盤及觸筆動作呢？通過對Android一些基本界面元素的操作的了解，Android將會如何處理鍵盤事件？仍在Activity中改事件響應函數來做到。一般是如下三個Android鍵盤操作的函數：onKeyDown, onKeyUp, on, onKeyMultiple參看如下Android鍵盤操作代碼：import android.app.Activity;import android.app.ProgressDialog;import android.os.Bundle;import android.view.KeyEvent;import android.view.Menu;import android.view.MenuItem;import android.widget.TextView;public class TestProgress extends Activity {private ProgressDialog progress = null;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {super.onCreateOptionsMenu(menu);menu.add(0, Menu.FIRST+1, 1, "Open Progress");menu.add(0, Menu.FIRST+2, 2, "Exit");return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {super.onOptionsItemSelected(item);switch (item.getItemId()){case Menu.FIRST +1:{progress = new ProgressDialog(this);progress.setTitle("Progress!!");progress.setMessage("Please wait for the operation...");progress.setCancelable(true);progress.show();//progress = ProgressDialog.show(this, "Progress!","Please wait for operation...");break;}case Menu.FIRST +2:{finish();break;}}return true;}@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {// TODO Auto-generated method stubsuper.onKeyDown(keyCode, event);setTitle("you pressed key:" + String.valueOf(keyCode));return true;}@Overridepublic boolean onKeyMultiple(int keyCode, int repeatCount,KeyEvent event) {// TODO Auto-generated method stubsuper.onKeyMultiple(keyCode, repeatCount, event);TextView tv = (TextView)this.findViewById(R.id.mainview);tv.setText("you have press key:[" + String.valueOf(keyCode) + "]for:" + String.valueOf(repeatCount) + "Times!");return true;}@Overridepublic boolean onKeyUp(int keyCode, KeyEvent event) {// TODO Auto-generated method stubsuper.onKeyUp(keyCode, event);setTitle("you release key:" + String.valueOf(keyCode));return true;}}

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