我创建了一个通过输入密码来更改图像的应用程序。我想在关闭应用程序后将其存储。所以我尝试使用共享首选项。但是我失败了...为什么下面的代码不能正常工作？
（PS 我上传了我的MainActivity代码。如果您需要其他活动或布局来回答我的问题，请说出我的意思
<html>
<head>
<title>MainActivity.java</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<style type="text/css">
.s0 {
color: #cc7832;
}
.s1 {
color: #a9b7c6;
}
.s2 {
color: #6a8759;
}
.s3 {
color: #808080;
}
.ln {
color: #606366;
font-weight: normal;
font-style: normal;
}
</style>
</head>
<body bgcolor="#2b2b2b">
<table CELLSPACING=0 CELLPADDING=5 COLS=1 WIDTH="100%" BGCOLOR="#606060">
<tr>
<td>
<center>
<font face="Arial, Helvetica" color="#000000">
MainActivity.java</font>
</center>
</td>
</tr>
</table>
<pre><a name="l1"><span class="ln">1 </span></a><span class="s0">package </span><span class="s1">com.swd.passwordtest2</span><span class="s0">;</span>
<a name="l2"><span class="ln">2 </span></a>
<a name="l3"><span class="ln">3 </span></a>import <span class="s1">androidx.appcompat.app.AppCompatActivity</span><span class="s0">;</span>
<a name="l4"><span class="ln">4 </span></a>import <span class="s1">android.content.Context</span><span class="s0">;</span>
<a name="l5"><span class="ln">5 </span></a>import <span class="s1">android.content.SharedPreferences</span><span class="s0">;</span>
<a name="l6"><span class="ln">6 </span></a>import <span class="s1">android.os.Bundle</span><span class="s0">;</span>
<a name="l7"><span class="ln">7 </span></a>import <span class="s1">android.view.View</span><span class="s0">;</span>
<a name="l8"><span class="ln">8 </span></a>import <span class="s1">android.widget.EditText</span><span class="s0">;</span>
<a name="l9"><span class="ln">9 </span></a>import <span class="s1">android.widget.ImageView</span><span class="s0">;</span>
<a name="l10"><span class="ln">10 </span></a>
<a name="l11"><span class="ln">11 </span></a>public class <span class="s1">MainActivity </span><span class="s0">extends </span><span class="s1">AppCompatActivity {</span>
<a name="l12"><span class="ln">12 </span></a>
<a name="l13"><span class="ln">13 </span></a> ImageView original<span class="s0">;</span>
<a name="l14"><span class="ln">14 </span></a> <span class="s1">EditText Pincode</span><span class="s0">;</span>
<a name="l15"><span class="ln">15 </span></a> <span class="s1">ImageView change2</span><span class="s0">;</span>
<a name="l16"><span class="ln">16 </span></a>
<a name="l17"><span class="ln">17 </span></a>
<a name="l18"><span class="ln">18 </span></a> <span class="s1">@Override</span>
<a name="l19"><span class="ln">19 </span></a> <span class="s0">protected void </span><span class="s1">onCreate(Bundle savedInstanceState) {</span>
<a name="l20"><span class="ln">20 </span></a> <span class="s0">super</span><span class="s1">.onCreate(savedInstanceState)</span><span class="s0">;</span>
<a name="l21"><span class="ln">21 </span></a> <span class="s1">setContentView(R.layout.activity_main)</span><span class="s0">;</span>
<a name="l22"><span class="ln">22 </span></a>
<a name="l23"><span class="ln">23 </span></a> <span class="s1">original = (ImageView)findViewById(R.id.original)</span><span class="s0">;</span>
<a name="l24"><span class="ln">24 </span></a> <span class="s1">Pincode = (EditText)findViewById(R.id.pincode)</span><span class="s0">;</span>
<a name="l25"><span class="ln">25 </span></a> <span class="s1">change2 = (ImageView)findViewById(R.id.original2)</span><span class="s0">;</span>
<a name="l26"><span class="ln">26 </span></a>
<a name="l27"><span class="ln">27 </span></a> <span class="s1">SharedPreferences preferences = getSharedPreferences(</span><span class="s2">"save"</span><span class="s0">,</span><span class="s1">MODE_PRIVATE)</span><span class="s0">;</span>
<a name="l28"><span class="ln">28 </span></a> <span class="s1">String original = preferences.getString(</span><span class="s2">"original"</span><span class="s0">, null</span><span class="s1">)</span><span class="s0">;</span>
<a name="l29"><span class="ln">29 </span></a> <span class="s1">}</span>
<a name="l30"><span class="ln">30 </span></a>
<a name="l31"><span class="ln">31 </span></a>
<a name="l32"><span class="ln">32 </span></a> <span class="s0">public void </span><span class="s1">inputClick(View view) {</span>
<a name="l33"><span class="ln">33 </span></a> <span class="s3">//입력 버튼을 누르면 실행</span>
<a name="l34"><span class="ln">34 </span></a>
<a name="l35"><span class="ln">35 </span></a> <span class="s0">if </span><span class="s1">(Pincode.getText().toString().equals(</span><span class="s2">"123456"</span><span class="s1">)) {</span>
<a name="l36"><span class="ln">36 </span></a> original.setImageResource(R.drawable.correct)<span class="s0">;</span>
<a name="l37"><span class="ln">37 </span></a> <span class="s1">Pincode.setText(</span><span class="s2">""</span><span class="s1">)</span><span class="s0">;</span>
<a name="l38"><span class="ln">38 </span></a>
<a name="l39"><span class="ln">39 </span></a> <span class="s1">SharedPreferences preferences = getSharedPreferences(</span><span class="s2">"save"</span><span class="s0">, </span><span class="s1">Context.MODE_PRIVATE)</span><span class="s0">;</span>
<a name="l40"><span class="ln">40 </span></a> <span class="s1">SharedPreferences.Editor editor = preferences.edit()</span><span class="s0">;</span>
<a name="l41"><span class="ln">41 </span></a> <span class="s1">editor.putString(</span><span class="s2">"original"</span><span class="s0">,</span><span class="s1">original.getResources().toString())</span><span class="s0">;</span>
<a name="l42"><span class="ln">42 </span></a> <span class="s1">editor.commit()</span><span class="s0">;</span>
<a name="l43"><span class="ln">43 </span></a> <span class="s1">}</span>
<a name="l44"><span class="ln">44 </span></a>
<a name="l45"><span class="ln">45 </span></a> <span class="s0">if </span><span class="s1">(Pincode.getText().toString().equals(</span><span class="s2">"222222"</span><span class="s1">)) {</span>
<a name="l46"><span class="ln">46 </span></a> change2.setImageResource(R.drawable.correctt)<span class="s0">;</span>
<a name="l47"><span class="ln">47 </span></a> <span class="s1">Pincode.setText(</span><span class="s2">""</span><span class="s1">)</span><span class="s0">;</span>
<a name="l48"><span class="ln">48 </span></a> <span class="s1">}</span>
<a name="l49"><span class="ln">49 </span></a>
<a name="l50"><span class="ln">50 </span></a> <span class="s0">else </span><span class="s1">{</span>
<a name="l51"><span class="ln">51 </span></a> Pincode.setText(<span class="s2">""</span><span class="s1">)</span><span class="s0">;</span>
<a name="l52"><span class="ln">52 </span></a> <span class="s1">}</span>
<a name="l53"><span class="ln">53 </span></a> }
<a name="l54"><span class="ln">54 </span></a>
<a name="l55"><span class="ln">55 </span></a>}
<a name="l56"><span class="ln">56 </span></a>
<a name="l57"><span class="ln">57 </span></a>
<a name="l58"><span class="ln">58 </span></a></pre>
</body>
</html>
答案 0 :(得分：0)
您需要使用“活动”的onCreate中的此信息来更新视图。
您有一个代码，可让您单击图片资源，并且如果您在共享首选项中具有“原始”首选项，则将其存储在字符串original中。但是随后您需要在视图上使用setImageResource使其起作用。
因此解决方案是使用onCreate中的代码或需要更新值的任何地方：
original.setImageResource(*value taken from SharedPrefs*);
更新：
您正在保存图像资源，但是如果只想保存该资源，则可能要保存original.getImageResource()。
要在下一个应用程序打开时将此图像恢复到imageView中，您需要使用preferences.getString()获取此资源。
然后，您需要在活动onCreate()方法中设置可绘制图像，以便在您之前使用original设置original.setImageResource()值并传递{{1} }值作为可绘制地址。
P.S。图片指针保存在int中，而不是int中，因此请正确保存：
String得到它
SharedPreferences preferences = getSharedPreferences("save", MODE_PRIVATE);
SharedPreferences.Editor editor = preferences.edit();
editor.putInt("original", R.drawable.correct);
editor.commit();