我已经构建了我的第一个应用程序，我想用密码保护它.我可以将密码存储在 Java 文件中，并且方法需要尽可能简单，因为在此应用程序之前我没有 java 甚至 xml 的经验.我已经尝试过几次但都失败了，所以我希望有人可以帮助我.

I've built my first app, and I would like to password protect it. It's fine for me to store the password in the Java files and the method needs to be as simple as possible because i have no experience of java or even xml before this app. I've had a few attempts and failed so I was hoping someone can help me out.

我已经创建了带有 EditText 字段的布局:

I've created the layout with an EditText field:

<EditText
 android:id="@+id/passwordedittext"
 android:layout_width="200dp"
 android:layout_height="50dp"
 android:inputType="textPassword"
 android:layout_marginTop="40dp"
 android:layout_marginLeft="20dp">
 <requestFocus />

还有一个提交按钮:

<Button
 android:id="@+id/submitbutton"
 android:layout_width="50dp"
 android:layout_height="50dp"
 android:layout_marginTop="40dp"
 android:background="@drawable/bgo"
 android:clickable="true" 
 android:layout_gravity="right|center_horizontal" 
 android:layout_marginRight="20dp"/>

Java 文件:

package com.berry;
import android.app.Activity;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;


public class password extends Activity{

MediaPlayer mpbuttonclick;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN,WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);

    setContentView(R.layout.password);

    mpbuttonclick = MediaPlayer.create(this, R.raw.keypress);

    Button sumbitButton = (Button) findViewById(R.id.submitbutton);
    sumbitButton.setOnClickListener(new View.OnClickListener() {        
        public void onClick(View v){
        EditText passwordEditText = (EditText) findViewById(R.id.passwordedittext);
                    if(passwordEditText.getText().toString()=="MyPasswordHere"){
                        startActivity(new Intent("com.berry.intro"));
                        mpbuttonclick.start();


                    }}});
    }}

推荐答案

这部分:

if(passwordEditText.getText().toString()=="MyPasswordHere")

不正确.应该是

if(passwordEditText.getText().toString().equals("MyPasswordHere"))

当比较原始数据类型(如int、char、boolean)时，您可以使用==，!= 等在比较对象时(如 String、Car 等)，您需要使用 .equals() 方法.

When comparing primitive data types (like int, char, boolean) you can use ==, !=, etc. When comparing objects (like String, Car, etc) you need to use the .equals() method.

另见此页.