模拟记住密码功能

最新推荐文章于 2024-07-12 17:02:42 发布

转载最新推荐文章于 2024-07-12 17:02:42 发布 · 279 阅读

文章标签：

本文介绍了一个简单的Android应用示例，展示了如何使用SharedPreferences保存用户的登录信息，并根据用户的选择自动填充登录字段。此外，还介绍了如何在Activity的生命周期中适当地加载和保存数据。

public class MainActivity extends Activity {
	EditText edName1;
	EditText edName2;
	CheckBox ckName;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.activity_main);
		edName1 = (EditText) findViewById(R.id.etUsername);
		edName2 = (EditText) findViewById(R.id.etPassword);
		ckName = (CheckBox) findViewById(R.id.checkBox1);
	}
	
	protected void onResume(){
		super.onResume();
		getData();
	}

	private void getData() {
		// TODO Auto-generated method stub
		SharedPreferences sharedPreferences=getSharedPreferences("data", MODE_PRIVATE);
		if(sharedPreferences.getBoolean("change", true)){
			edName1.setText(sharedPreferences.getString("zhanghao", ""));
			edName2.setText(sharedPreferences.getString("key", ""));
			ckName.setChecked(true);
		}else{
			edName1.setText("");
			edName2.setText("");
			ckName.setChecked(false);
		}
		
	}

	public void click(View view) {
		if (!(TextUtils.isEmpty(edName1.getText()))
				&& !(TextUtils.isEmpty(edName2.getText()))) {
			if (edName1.getText().toString().equals("root")
					&& edName2.getText().toString().equals("123456")) {
				if (ckName.isChecked()) {
					save();
					show();
				}else{
					delete();
					show();
				}
			} else {
				Toast.makeText(this, "密码错误", Toast.LENGTH_LONG).show();
			}
		} else {
			Toast.makeText(this, "账号密码不能为空", Toast.LENGTH_LONG).show();
		}

	}

	private void delete() {
		// TODO Auto-generated method stub
		SharedPreferences sharedPreferences = getSharedPreferences("data",
				MODE_PRIVATE);
		Editor editor = sharedPreferences.edit();
		editor.putString("zhanghao", "");
		editor.putString("key", "");
		editor.putBoolean("change", false);
		editor.commit();
		
	}

	public void show() {
		// TODO Auto-generated method stub
		Intent intent=new Intent(MainActivity.this, ShowActivity.class);
		startActivity(intent);
		
	}

	public void save() {
		String name = edName1.getText().toString();
		String key = edName2.getText().toString();
		SharedPreferences sharedPreferences = getSharedPreferences("data",
				MODE_PRIVATE);
		Editor editor = sharedPreferences.edit();
		editor.putString("zhanghao", name);
		editor.putString("key", key);
		editor.putBoolean("change", true);
		editor.commit();
	}
	

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;

public class ShowActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_show);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.show, menu);
		return true;
	}

}