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jsonコードを取得してボタンをクリックすると出力を表示する簡単なAndroidプロジェクトを作成しようとしています。私はここで NoClassDefFoundErrorによる不正な状態の例外
は、package com.example.tejas.comon;
import android.support.v7.app.AppCompatActivity;
import java.io.File;
import java.io.IOException;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
public class MainActivity extends AppCompatActivity {
private static final String TAG = "myMessage"; long id;
String firstname = "";
String lastname = "";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void onClick(View view){
try{
ObjectMapper mapper = new ObjectMapper();
JsonNode root = mapper.readTree(new File("E:\\a.json"));
TextView textViewID =(TextView) findViewById(R.id.text_Id);
TextView textViewFname =(TextView) findViewById(R.id.text_Fname);
TextView textViewLname =(TextView) findViewById(R.id.text_Lname);
//Get ID
id = root.path("id").asLong();
textViewID.setText((int)id);
//Get Name
JsonNode nameNode = root.path("name");
if(nameNode.isMissingNode()){
//do nothing now
} else {
firstname = nameNode.path("first").asText();
lastname = nameNode.path("last").asText();
textViewFname.setText(firstname);
textViewLname.setText(lastname);
}
Log.i(TAG,Long.toString(id));
Log.i(TAG,firstname);
Log.i(TAG,lastname);
}catch (JsonGenerationException e){
e.printStackTrace();
}catch (JsonMappingException e){
e.printStackTrace();
}catch (IOException e){
e.printStackTrace();
}
}
}
コードであり、ここでエラー
11-01 11:51:54.573 3561-3561/com.example.tejas.comon E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.tejas.comon, PID: 3561
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.NoClassDefFoundError: Failed resolution of: Lcom/fasterxml/jackson/annotation/JsonAutoDetect;
at com.fasterxml.jackson.databind.introspect.VisibilityChecker$Std.<clinit>(VisibilityChecker.java:172)
at com.fasterxml.jackson.databind.introspect.VisibilityChecker$Std.defaultInstance(VisibilityChecker.java:180)
at com.fasterxml.jackson.databind.ObjectMapper.<clinit>(ObjectMapper.java:195)
at com.example.tejas.comon.MainActivity.onClick(MainActivity.java:38)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.fasterxml.jackson.annotation.JsonAutoDetect" on path: DexPathList[[dex file "/data/data/com.example.tejas.comon/files/instant-run/dex/slice-support-annotations-24.2.1_b6343c6d7c5e90b35a6cd0b4b81057315b662eb5-classes.dex", dex file "/data/data/com.example.tejas.comon/files/instant-run/dex/slice-slice_9-classes.dex", dex file "/data/data/com.example.tejas.comon/files/instant-run/dex/slice-slice_8-classes.dex", dex file "/data/data/com.example.tejas.comon/files/instant-run/dex/slice-slice_7-classes.dex", dex file "/data/data/com.example.tejas.comon/files/instant-run/dex/slice-slice_6-classes.dex", dex file "/data/data/com.example.tejas.comon/files/instant-run/dex/slice-slice_5-classes.dex", dex file "/data/data/com.example.tejas.comon/files/instant-run/dex/slice-slice_4-classes.dex", dex file "/data/data/com.example.tejas.comon/files/instant-run/dex/slice-slice_3-classes.dex", dex file "/data/data/com.example.tejas.comon/files/instant-run/dex/slice-slice_2-classes.dex", dex file "/data/data/com.example.tejas.comon/files/instant-run/dex/slice-slice_1-classes.dex", dex file "/data/data/com.example.tejas.comon/files/instant-run/dex/slice-slice_0-classes.dex", dex file "/data/data/com.example.tejas.comon/files/instant-run/dex/slice-internal_impl-24.2.1_b359b2374d8440f9d50bbae0e692ec6e2c581da6-classes.dex", dex file "/data/data/com.example.tejas.comon/files/instant-run/dex/slice-internal_impl-24.2.1_ab66133e1fbd3f516301dedaf0cec658eee394b0-classes.dex", dex file "/data/data/com.example.tejas.comon/files/instant-run/dex/slice-internal_impl-24.2.1_a6744094956b1304b74e46941d88d9ac7aa74c2a-classes.dex", dex file "/data/data/com.example.tejas.comon/files/instant-run/dex/slice-internal_impl-24.2.1_5e587ec0010893c0647a59d4eedb4d6a8a6d0204-classes.dex", dex file "/data/data/com.example.tejas.comon/files/instant-run/dex/slice-internal_impl-24.2.1_14cece6c6722e9e44464e611791fca05f5804d5f-classes.dex", dex file "/data/data/com.example.tejas.comon/files/instant-run/dex/slice-com.fasterxml.jackson.databind_d8adf718561770d2b8c122c749c1791ccbb850d4-classes.dex", dex file "/data/data/com.example.tejas.comon/files/instant-run/dex/slice-com.fasterxml.jackson.core_21a86c83e902b6b59aaee614f85bafbfffc4ad8f-classes.dex", dex file "/data/data/com.example.tejas.comon/files/instant-run/dex/slice-com.android.support-support-vector-drawable-24.2.1_84bbb9c551b4ae409ae8
これらの外部ライブラリを正しくインポートして、それらがgradle syncであることを確認しました。
onClickのIllegalStateExceptionは、他のプロジェクトで私を悩ませている問題です。誰かがこの問題を解決できますか？
編集1：XMLファイル
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.tejas.comon.MainActivity">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Click Me !"
android:id="@+id/myButton"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:onClick="onClick" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="ID:"
android:id="@+id/textView"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:id="@+id/text_Id"
android:layout_alignParentTop="true"
android:layout_alignStart="@+id/myButton" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="First Name:"
android:id="@+id/textView3"
android:layout_below="@+id/textView"
android:layout_alignParentStart="true"
android:layout_marginTop="45dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:id="@+id/text_Fname"
android:layout_alignTop="@+id/textView3"
android:layout_alignStart="@+id/text_Id" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Last Name:"
android:id="@+id/textView5"
android:layout_below="@+id/textView3"
android:layout_alignParentStart="true"
android:layout_marginTop="57dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:id="@+id/text_Lname"
android:layout_alignTop="@+id/textView5"
android:layout_alignStart="@+id/text_Fname" />
</RelativeLayout>
まず最新バージョン 1.jackson、データバインド 2.jackson-注釈 3.jacksonコアでこれらの依存関係、なぜあなたは思いますかあなたのアンドロイドデバイスにはこのパスがあります： '' E：\\ a.json "'？また、ProGuardを使用していますか？ –
いいえ、私はProGuardを使用していません。私は仮想デバイス上で実行しているので、Eドライブ内のファイルをフェッチしてはいけませんか？そうでない場合は、a.jsonファイルをプロジェクトにリンクするにはどうすればよいですか？ –
xmlファイルも追加 –