Android中的错误-Eclipse

Question

最近，我开始开发android应用程序，在模拟器中编译应用程序时，该过程终止了。

LogCat：

05-10 17:55:21.539: D/AndroidRuntime(4293): Shutting down VM
05-10 17:55:21.539: W/dalvikvm(4293): threadid=1: thread exiting with uncaught exception (group=0x40020578)
05-10 17:55:21.562: E/AndroidRuntime(4293): FATAL EXCEPTION: main
05-10 17:55:21.562: E/AndroidRuntime(4293): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{br.me.example.clientes/br.me.example.clientes.Principal}: java.lang.ClassNotFoundException: br.me.example.clientes.Principal in loader dalvik.system.PathClassLoader[/data/app/br.me.example.clientes-2.apk]
05-10 17:55:21.562: E/AndroidRuntime(4293):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1573)
05-10 17:55:21.562: E/AndroidRuntime(4293):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
05-10 17:55:21.562: E/AndroidRuntime(4293):     at android.app.ActivityThread.access$1500(ActivityThread.java:117)
05-10 17:55:21.562: E/AndroidRuntime(4293):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
05-10 17:55:21.562: E/AndroidRuntime(4293):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-10 17:55:21.562: E/AndroidRuntime(4293):     at android.os.Looper.loop(Looper.java:130)
05-10 17:55:21.562: E/AndroidRuntime(4293):     at android.app.ActivityThread.main(ActivityThread.java:3687)
05-10 17:55:21.562: E/AndroidRuntime(4293):     at java.lang.reflect.Method.invokeNative(Native Method)
05-10 17:55:21.562: E/AndroidRuntime(4293):     at java.lang.reflect.Method.invoke(Method.java:507)
05-10 17:55:21.562: E/AndroidRuntime(4293):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
05-10 17:55:21.562: E/AndroidRuntime(4293):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
05-10 17:55:21.562: E/AndroidRuntime(4293):     at dalvik.system.NativeStart.main(Native Method)
05-10 17:55:21.562: E/AndroidRuntime(4293): Caused by: java.lang.ClassNotFoundException: br.me.example.clientes.Principal in loader dalvik.system.PathClassLoader[/data/app/br.me.example.clientes-2.apk]
05-10 17:55:21.562: E/AndroidRuntime(4293):     at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
05-10 17:55:21.562: E/AndroidRuntime(4293):     at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
05-10 17:55:21.562: E/AndroidRuntime(4293):     at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
05-10 17:55:21.562: E/AndroidRuntime(4293):     at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
05-10 17:55:21.562: E/AndroidRuntime(4293):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1565)
05-10 17:55:21.562: E/AndroidRuntime(4293):     ... 11 more

班长

 package br.me.clientes; import br.me.example.clientes.R; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.Button; public class Principal extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.principal); Button btnCadastro = (Button) findViewById(R.id.btnCadastro); Button btnListar = (Button) findViewById(R.id.btnListar); Button btnApagar = (Button) findViewById(R.id.btnApagar); Button btnSair = (Button) findViewById(R.id.btnSair); btnCadastro.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub startActivity(new Intent(getBaseContext(), Cadastro.class)); } }); btnListar.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub startActivity(new Intent(getBaseContext(), Cadastro.class)); } }); btnApagar.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub startActivity(new Intent(getBaseContext(), Cadastro.class)); } }); btnSair.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub startActivity(new Intent(getBaseContext(), Cadastro.class)); } }); } } 

卡达斯特罗课程

 package br.me.clientes; import android.app.Activity; import android.app.ProgressDialog; import android.graphics.Color; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; import br.me.example.clientes.R; public class Cadastro extends Activity implements Runnable { private ProgressDialog pd; private String valor; private EditText txtNome; private EditText txtEmail; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.cadastro); Button btnOk = (Button) findViewById(R.id.btnOk); txtNome = (EditText) findViewById(R.id.txtNome); txtEmail = (EditText) findViewById(R.id.txtEmail); final EditText txtEndereco = (EditText) findViewById(R.id.txtEndereco); final EditText txtNumero = (EditText) findViewById(R.id.txtNumero); btnOk.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { pd = ProgressDialog.show(Cadastro.this, "Aguarde", "Cadastrando informações", true, false); Thread t = new Thread(Cadastro.this); t.start(); } }); } @Override public void run() { // TODO Auto-generated method stub valor = txtNome.getText().toString(); if (txtNome.getText().toString().equals(" ")) { h2.sendEmptyMessage(0); } } private Handler h = new Handler() { @Override public void handleMessage(Message msg) { pd.dismiss(); Toast t = Toast.makeText(getBaseContext(), txtNome.getText(), Toast.LENGTH_SHORT); t.show(); } }; private Handler h2 = new Handler() { @Override public void handleMessage(Message msg) { pd.dismiss(); Toast t = Toast.makeText(getBaseContext(), "Preencha o campo Nome", Toast.LENGTH_SHORT); t.show(); txtNome.setBackgroundColor(Color.RED); } }; } 

Android清单

 <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="br.me.example.clientes" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="21" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".Principal"> <intent-filter> <action android:name="android.intent.action.MAIN"> </action> <category android:name="android.intent.category.LAUNCHER"> </category> </intent-filter> </activity> <activity android:name=".Cadastro"></activity> </application> </manifest> 

准备。

如果您需要什么，请告诉我。

Answer 1

您的包裹名称有问题。 在Manifest您指定默认软件包为br.me.example.clientes 。 然后，您通过.Principal指定您的班级，它将使用以下路径br.me.example.clientes.Principal搜索一个班级。

但是，正如我们在您的Principal类中看到的那样，它位于br.me.clientes.Principal 。

尝试在Manifest或类中修复路径。