Question

我想从EditText中获取String，然后从中读取单个字符。我尝试过以下代码：

String PT = pt.getText().toString(); 
int len = PT.length(); 
char chars[] = PT.toCharArray(); 
for(int i=0;i<len;i++)
{ Toast.makeText(encrypt.this,chars[i], 0).show(); }

但是我收到了Force Close错误。我哪里错了？

我对这一切都很陌生！

这是LogCat：

11-28 12:41:01.228: E/AndroidRuntime(1632):     at android.app.ActivityThread.main(ActivityThread.java:3683)
11-28 12:41:01.228: E/AndroidRuntime(1632):     at java.lang.reflect.Method.invokeNative(Native Method)
11-28 12:41:01.228: E/AndroidRuntime(1632):     at java.lang.reflect.Method.invoke(Method.java:507)
11-28 12:41:01.228: E/AndroidRuntime(1632):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
11-28 12:41:01.228: E/AndroidRuntime(1632):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
11-28 12:41:01.228: E/AndroidRuntime(1632):     at dalvik.system.NativeStart.main(Native Method)
11-28 12:46:43.688: W/KeyCharacterMap(1674): No keyboard for id 0
11-28 12:46:43.688: W/KeyCharacterMap(1674): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
11-28 12:46:54.442: W/ResourceType(1674): No package identifier when getting value for resource number 0x00000061
11-28 12:46:54.448: D/AndroidRuntime(1674): Shutting down VM
11-28 12:46:54.448: W/dalvikvm(1674): threadid=1: thread exiting with uncaught exception (group=0x40015560)
11-28 12:46:54.459: E/AndroidRuntime(1674): FATAL EXCEPTION: main
11-28 12:46:54.459: E/AndroidRuntime(1674): android.content.res.Resources$NotFoundException: String resource ID #0x61
11-28 12:46:54.459: E/AndroidRuntime(1674):     at android.content.res.Resources.getText(Resources.java:201)
11-28 12:46:54.459: E/AndroidRuntime(1674):     at android.widget.Toast.makeText(Toast.java:258)
11-28 12:46:54.459: E/AndroidRuntime(1674):     at com.project.DENCrypt.encrypt$1.onClick(encrypt.java:33)
11-28 12:46:54.459: E/AndroidRuntime(1674):     at android.view.View.performClick(View.java:2485)
11-28 12:46:54.459: E/AndroidRuntime(1674):     at android.view.View$PerformClick.run(View.java:9080)
11-28 12:46:54.459: E/AndroidRuntime(1674):     at android.os.Handler.handleCallback(Handler.java:587)
11-28 12:46:54.459: E/AndroidRuntime(1674):     at android.os.Handler.dispatchMessage(Handler.java:92)
11-28 12:46:54.459: E/AndroidRuntime(1674):     at android.os.Looper.loop(Looper.java:123)
11-28 12:46:54.459: E/AndroidRuntime(1674):     at android.app.ActivityThread.main(ActivityThread.java:3683)
11-28 12:46:54.459: E/AndroidRuntime(1674):     at java.lang.reflect.Method.invokeNative(Native Method)
11-28 12:46:54.459: E/AndroidRuntime(1674):     at java.lang.reflect.Method.invoke(Method.java:507)
11-28 12:46:54.459: E/AndroidRuntime(1674):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
11-28 12:46:54.459: E/AndroidRuntime(1674):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
11-28 12:46:54.459: E/AndroidRuntime(1674):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

Toast.makeText(encrypt.this,String.valueOf(chars[i]), 0).show();

而不是

Toast.makeText(encrypt.this,chars[i], 0).show();

Answer 2

试试这个：

Toast.makeText(encrypt.this,chars[i] + "", 0).show();

它与Ram的相同方式

Answer 3

将您的toast消息更改为

Toast.makeText(encrypt.this,Character.toString(chars[i]), Toast.LENGTH_SHORT).show();

问题在于Toast消息。吐司无法显示字符。所以将charater转换为字符串并显示

Answer 4

chars[i]是整数值。如果仔细查看错误日志，您将看到

android.content.res.Resources$NotFoundException: String resource ID #0x61

（如果你传递整数参数，android将查找具有此Id的资源）

您可以直接从字符串中打印字符：

Toast.makeText(encrypt.this,PT[i], 0).show();

Answer 5

从读取数据时，编辑文本（布局资源）可能不可用。执行

时，只需检查是否能够获得空值

EditText edt1 = (EditText)findViewById(R.id.myEditView);

log edt1（通过log，system.out.println）;

如何从EditText获取字符？

5 个答案: