android 按两次返回键退出
16lz
2021-12-04
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- package com.anjoyo.test;
- import android.app.Activity;
- import android.os.Bundle;
- import android.view.KeyEvent;
- import android.widget.Toast;
- public class TestActivity extends Activity {
- private long mExitTime;
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- }
-
- public boolean onKeyDown(int keyCode, KeyEvent event) {
- if (keyCode == KeyEvent.KEYCODE_BACK) {
- if ((System.currentTimeMillis() - mExitTime) > 2000) {
- Object mHelperUtils;
- Toast.makeText(this, "再按一次退出程序", Toast.LENGTH_SHORT).show();
- mExitTime = System.currentTimeMillis();
- } else {
- finish();
- }
- return true;
- }
- return super.onKeyDown(keyCode, event);
- }
- }
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