Android移动终端设计实验二+事件监听实验

╰+哭是因爲堅強的太久メ 2022-07-15 19:26 151阅读 0赞

**实验2：事件监听实验**

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 <td> 一、&nbsp;&nbsp;&nbsp;&nbsp; 实验目的 本次实验的目的是掌握控件的基于事件监听内部类、基于事件监听内部匿名类、Activity本身作为事件监听器以及直接绑定到标签等四种常用的事件处理方法。 </td> 
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 <td> 二、&nbsp;&nbsp;&nbsp;&nbsp; 实验环境 Windows7&nbsp; Eclipse MARS.2&nbsp; AVD虚拟机 </td> 
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 <td> 三、实验内容及结果 通过实验1设计的登录对话框掌握android系统的事件监听的几种处理方法。具体要求如下： &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; i.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 基于事件监听内部类实现事件监听处理； &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ii.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 基于事件监听内部匿名类实现事件监听处理； &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; iii.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Activity本身作为事件监听器； &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; iv.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 直接绑定到标签； &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; v.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 在“登录”按钮事件代码中，判断用户名和密码是否正确。 代码实现和测试结果： 内部类： 代码实现： Activity_main.xml &lt;LinearLayoutxmlns:android= "http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"&gt; &lt;TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="欢迎使用登录系统&nbsp;&nbsp;&nbsp; -by 庞振男" &gt;&lt;/TextView&gt; &nbsp; &nbsp; &lt;LinearLayout &nbsp; android:layout_width="match_parent" &nbsp; android:layout_height="wrap_content" &nbsp; android:orientation="horizontal" &nbsp; &gt; &lt;TextView android:id="@+id/user" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="用户名："/&gt; &lt;EditText android:id="@+id/username" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="input username" &nbsp; &gt;&lt;/EditText&gt; &nbsp;&nbsp;&nbsp;&nbsp; &lt;/LinearLayout&gt; &nbsp;&nbsp;&nbsp;&nbsp; &lt;LinearLayout &nbsp; android:layout_width="match_parent" &nbsp; android:layout_height="wrap_content" &nbsp; android:orientation="horizontal" &nbsp; &gt; &lt;TextView android:id="@+id/pass" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="密码："/&gt; &lt;EditText android:id="@+id/password" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="input password" android:inputType="textPassword" &gt;&lt;/EditText&gt; &nbsp; &lt;/LinearLayout&gt; &nbsp; &nbsp; &lt;LinearLayout &nbsp; android:layout_width="match_parent" &nbsp; android:layout_height="wrap_content" &nbsp; android:orientation="horizontal" &nbsp; &gt; &nbsp;&nbsp;&nbsp;&nbsp; &lt;Button &nbsp;&nbsp;&nbsp;&nbsp; android:id="@+id/login" &nbsp;&nbsp;&nbsp;&nbsp; android:layout_width="wrap_content" &nbsp; android:layout_height="match_parent" &nbsp; android:text="登录" &nbsp;&nbsp;&nbsp;&nbsp; &gt;&lt;/Button&gt; &nbsp;&nbsp;&nbsp;&nbsp; &lt;Button &nbsp;&nbsp;&nbsp;&nbsp; android:id="@+id/cancel" &nbsp;&nbsp;&nbsp;&nbsp; android:layout_width="wrap_content" &nbsp; android:layout_height="match_parent" &nbsp; android:text="取消" &nbsp;&nbsp;&nbsp;&nbsp; &gt;&lt;/Button&gt; &nbsp;&nbsp;&nbsp;&nbsp; &lt;/LinearLayout&gt; &nbsp; &nbsp; &lt;TextView &nbsp; android:id="@+id/show" &nbsp; android:layout_width="wrap_content" &nbsp; android:layout_height="wrap_content" &nbsp; android:text="tips:"/&gt; &nbsp; &lt;/LinearLayout&gt; &nbsp; &nbsp; &nbsp; &nbsp; MainActivity.java &nbsp; packagecom.example.plistener_neibulei; &nbsp; importandroid.app.Activity; importandroid.os.Bundle; importandroid.view.Menu; importandroid.view.MenuItem; importandroid.view.View; importandroid.widget.Button; importandroid.widget.EditText; importandroid.widget.TextView; importandroid.widget.Toast; &nbsp; publicclassMainActivityextends Activity { &nbsp; &nbsp; Button login; &nbsp; EditTextusername,password; &nbsp; @Override &nbsp; protectedvoidonCreate (Bundle savedInstanceState) { &nbsp;&nbsp;&nbsp;&nbsp; super.onCreate(savedInstanceState); &nbsp;&nbsp;&nbsp;&nbsp; setContentView(R.layout.activity_main); &nbsp;&nbsp;&nbsp;&nbsp; login=(Button)findViewById(R.id.login); &nbsp;&nbsp;&nbsp;&nbsp; login.setOnClickListener(newLoginClick()); &nbsp;&nbsp;&nbsp;&nbsp; &nbsp; } &nbsp; classLoginClickimplementsView. OnClickListener{ &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; @Override &nbsp;&nbsp;&nbsp;&nbsp; publicvoidonClick(View v) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // TODO Auto-generated method stub &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; username=(EditText)findViewById (R.id.username); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; password=(EditText)findViewById (R.id.password); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; String name=username.getText().toString(); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; String pass=password.getText().toString(); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; TextViewtv=(TextView)findViewById(R.id.show); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if(name.equals("pangzhennan")&amp;&amp; pass.equals("123456")){ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; tv.setText("恭喜"+name+"登录成功！"); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; else{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; tv.setText("悲剧啊！~~~非管理员访问*@*"); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //Toast.makeText(this,name, 1); &nbsp;&nbsp;&nbsp;&nbsp; } &nbsp; &nbsp; &nbsp; } } &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 内部匿名类 &nbsp; 代码实现： Activity_main.xml不变 MianActivity.java文件内容如下： &nbsp; packagecom.example.plistener_neibulei; &nbsp; importandroid.app.Activity; importandroid.os.Bundle; importandroid.view.Menu; importandroid.view.MenuItem; importandroid.view.View; importandroid.view.View.OnClickListener; importandroid.widget.Button; importandroid.widget.EditText; importandroid.widget.TextView; importandroid.widget.Toast; &nbsp; publicclassMainActivityextends Activity { &nbsp; &nbsp; Button login; &nbsp; EditTextusername,password; &nbsp; @Override &nbsp; protectedvoidonCreate (Bundle savedInstanceState) { &nbsp;&nbsp;&nbsp;&nbsp; super.onCreate(savedInstanceState); &nbsp;&nbsp;&nbsp;&nbsp; setContentView(R.layout.activity_main); &nbsp;&nbsp;&nbsp;&nbsp; login=(Button)findViewById(R.id.login); &nbsp;&nbsp;&nbsp;&nbsp; login.setOnClickListener (newOnClickListener(){ &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; @Override &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; publicvoidonClick(View v) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // TODO Auto-generated method stub &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; username=(EditText)findViewById(R.id.username); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; password=(EditText)findViewById(R.id.password); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; String name=username.getText().toString(); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; String pass=password.getText().toString(); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; TextViewtv=(TextView) findViewById(R.id.show); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if(name.equals("pangzhennan") &amp;&amp;pass.equals("123456")){ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; tv.setText("恭喜"+name+"登录成功！"); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; else{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; tv.setText("悲剧啊！~~~非管理员访问*@*"); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp;&nbsp; }); &nbsp; } &nbsp; /*class LoginClick implements View.OnClickListener{ &nbsp; &nbsp;&nbsp;&nbsp;&nbsp; @Override &nbsp;&nbsp;&nbsp;&nbsp; public void onClick(View v) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // TODO Auto-generated method stub &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; username=(EditText)findViewById(R.id.username); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; password=(EditText)findViewById(R.id.password); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; String name=username.getText().toString(); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; String pass=password.getText().toString(); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; TextViewtv=(TextView)findViewById(R.id.show); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if(name.equals("pangzhennan") &amp;&amp;pass.equals("123456")){ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; tv.setText("恭喜"+name+"登录成功！"); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; else{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; tv.setText("悲剧啊！~~~非管理员访问*@*"); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp;&nbsp; } &nbsp; }*/ } &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 3．Activity本身作为事件监听器 &nbsp; &nbsp; Activity_main.xml不变 MianActivity.java文件内容如下： packagecom.example.plistener_neibulei; &nbsp; importandroid.app.Activity; importandroid.os.Bundle; importandroid.view.Menu; importandroid.view.MenuItem; importandroid.view.View; importandroid.view.View.OnClickListener; importandroid.widget.Button; importandroid.widget.EditText; importandroid.widget.TextView; importandroid.widget.Toast; &nbsp; publicclassMainActivityextends Activity implementsOnClickListener{ &nbsp; &nbsp; Button login; &nbsp; EditTextusername,password; &nbsp; @Override &nbsp; protectedvoidonCreate (Bundle savedInstanceState) { &nbsp;&nbsp;&nbsp;&nbsp; super.onCreate(savedInstanceState); &nbsp;&nbsp;&nbsp;&nbsp; setContentView(R.layout.activity_main); &nbsp;&nbsp;&nbsp;&nbsp; login=(Button)findViewById(R.id.login); &nbsp;&nbsp;&nbsp;&nbsp; login.setOnClickListener(this); &nbsp; } &nbsp; @Override &nbsp; publicvoidonClick(View v) { &nbsp;&nbsp;&nbsp;&nbsp; // TODO Auto-generated method stub &nbsp;&nbsp;&nbsp;&nbsp; username=(EditText)findViewById(R.id.username); &nbsp;&nbsp;&nbsp;&nbsp; password=(EditText)findViewById(R.id.password); &nbsp;&nbsp;&nbsp;&nbsp; String name=username.getText().toString(); &nbsp;&nbsp;&nbsp;&nbsp; String pass=password.getText().toString(); &nbsp;&nbsp;&nbsp;&nbsp; TextViewtv=(TextView)findViewById(R.id.show); &nbsp;&nbsp;&nbsp;&nbsp; if(name.equals("pangzhennan") &amp;&amp;pass.equals("123456")){ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; tv.setText("恭喜"+name+"登录成功！"); &nbsp;&nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp;&nbsp; else{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; tv.setText("悲剧啊！~~~非管理员访问*@*"); &nbsp;&nbsp;&nbsp;&nbsp; } &nbsp; } } &nbsp; &nbsp; 4.直接绑定到标签 &nbsp; Activity_main.xml不变 MianActivity.java文件内容如下： packagecom.example.plistener_neibulei; &nbsp; importandroid.app.Activity; importandroid.os.Bundle; importandroid.view.Menu; importandroid.view.MenuItem; importandroid.view.View; importandroid.view.View.OnClickListener; importandroid.widget.Button; importandroid.widget.EditText; importandroid.widget.TextView; importandroid.widget.Toast; &nbsp; publicclassMainActivityextends Activity { &nbsp; &nbsp; Button login; &nbsp; EditTextusername,password; &nbsp; @Override &nbsp; protectedvoidonCreate (Bundle savedInstanceState) { &nbsp;&nbsp;&nbsp;&nbsp; super.onCreate(savedInstanceState); &nbsp;&nbsp;&nbsp;&nbsp; setContentView(R.layout.activity_main); &nbsp;&nbsp;&nbsp;&nbsp; login=(Button)findViewById(R.id.login); &nbsp;&nbsp;&nbsp;&nbsp; &nbsp; } &nbsp; publicvoidHandlerClick(View v) { &nbsp;&nbsp;&nbsp;&nbsp; // TODO Auto-generated method stub &nbsp;&nbsp;&nbsp;&nbsp; username=(EditText)findViewById(R.id.username); &nbsp;&nbsp;&nbsp;&nbsp; password=(EditText)findViewById(R.id.password); &nbsp;&nbsp;&nbsp;&nbsp; String name=username.getText().toString(); &nbsp;&nbsp;&nbsp;&nbsp; String pass=password.getText().toString(); &nbsp; TextViewtv=(TextView)findViewById(R.id.show); &nbsp;&nbsp;&nbsp;&nbsp; if(name.equals("pangzhennan") &amp;&amp;pass.equals("123456")){ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; tv.setText("恭喜"+name+"登录成功！"); &nbsp;&nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp;&nbsp; else{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; tv.setText("悲剧啊！~~~非管理员访问*@*"); &nbsp;&nbsp;&nbsp;&nbsp; } &nbsp; } } &nbsp; <a rel="nofollow"></a> </td> 
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 <td> 四、实验过程分析与讨论 （本部分写出实验中存在的问题及解决方法） 在做此次实验时，首先就要先设计页面，把页面设计好之后才能对其添加监听器，添加监听器时需要提前对其进行判断，如果满足条件的话，才能触发事件，否则不能。经过总结，可以得出这样的结论：如果只有一个事件需要被监听，那么四种处理方法中可以采用内部匿名类的方法，而如果有多个事件需要被监听，则可以采用把Activity本身作为事件监听器的方法。 </td> 
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