Android键盘操作响应
16lz
2021-01-23
在Android中是通过触屏及键盘来操作程序的,我们如何响应一般的键盘及触笔动作呢?通过对Android一些基本界面元素的操作的了解,如果你再熟悉MVC你可以猜到Android将会如何处理键盘事件,恭喜你,猜对了,仍在Activity中改事件响应函数来做到。一般是如下三个函数:
onKeyDown, onKeyUp, on, onKeyMultiple
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; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } @Override public 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; } @Override public 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; } @Override public boolean onKeyDown(int keyCode, KeyEvent event) {// TODO Auto-generated method stub super.onKeyDown(keyCode, event); setTitle("you pressed key:" + String.valueOf(keyCode)); return true; } @Override public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { // TODO Auto-generated method stub super.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; } @Override public boolean onKeyUp(int keyCode, KeyEvent event) { // TODO Auto-generated method stub super.onKeyUp(keyCode, event); setTitle("you release key:" + String.valueOf(keyCode)); return true; } }
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