android - 无法启动活动 Android Studio
问题描述
我试图通过单击 android studio 中的按钮从一项活动转到另一项活动。但是当我尝试时，我看到第二个活动，但没有默认，只有第二个活动，当我删除第二个活动时，我再也看不到第一个活动并且我的应用程序关闭。
我的主要活动
package com.niccode.desarrollounaapp;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import androidx.appcompat.app.AppCompatActivity;
import com.google.android.material.datepicker.MaterialDatePicker;
import com.google.android.material.datepicker.MaterialPickerOnPositiveButtonClickListener;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button Siguiente = (Button) findViewById(R.id.Siguiente);
final EditText eName = findViewById(R.id.tiNombreCompleto);
final EditText eFecha = findViewById(R.id.Calendario);
final EditText eTelefono = findViewById(R.id.tiTelefono);
final EditText eEmail = findViewById(R.id.tiEmail);
final EditText eDescripcion = findViewById(R.id.tiDescripcionContacto);
MaterialDatePicker.Builder<Long> builder = MaterialDatePicker.Builder.datePicker();
builder.setTitleText(getResources().getString(R.string.date1));
final MaterialDatePicker<Long> materialDatePicker = builder.build();
eFecha.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
materialDatePicker.show(getSupportFragmentManager(), "DATE_PICKER");
}
});
materialDatePicker.addOnPositiveButtonClickListener(new MaterialPickerOnPositiveButtonClickListener() {
@Override
public void onPositiveButtonClick(Object selection) {
eFecha.setText(materialDatePicker.getHeaderText());
}
});
/*
Siguiente.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(MainActivity.this, Confirmar_Datos.class);
intent.putExtra(getResources().getString(R.string.pname), eName.getText().toString());
intent.putExtra(getResources().getString(R.string.pdate), eFecha.getText().toString());
intent.putExtra(getResources().getString(R.string.ptelefono), eTelefono.getText().toString());
intent.putExtra(getResources().getString(R.string.pemail), eEmail.getText().toString());
intent.putExtra(getResources().getString(R.string.pDescripcion), eDescripcion.getText().toString());
startActivity(intent);
}
});
*/
}
}
我的安卓清单
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.niccode.desarrollounaapp">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
XML文件，在做我试过的方法之前，如果它运作良好
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:context=".MainActivity"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_marginTop="16dp"
android:layout_marginRight="16dp"
android:layout_marginLeft="16dp"
>
<com.google.android.material.textfield.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
android:layout_marginBottom = "10dp"
>
<com.google.android.material.textfield.TextInputEditText
android:id="@+id/tiNombreCompleto"
style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:drawableStart="@drawable/name"
android:hint="@string/nombre_completo" />
</com.google.android.material.textfield.TextInputLayout>
<com.google.android.material.textfield.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
android:layout_marginBottom = "10dp"
>
<com.google.android.material.textfield.TextInputEditText
android:id="@+id/Calendario"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:drawableStart="@drawable/date"
android:focusable="false"
android:hint="@string/date1"
>
</com.google.android.material.textfield.TextInputEditText>
</com.google.android.material.textfield.TextInputLayout>
<com.google.android.material.textfield.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
android:layout_marginBottom = "10dp"
>
<com.google.android.material.textfield.TextInputEditText
android:id="@+id/tiTelefono"
android:hint="@string/telefono"
android:drawableStart="@drawable/telefono"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</com.google.android.material.textfield.TextInputLayout>
<com.google.android.material.textfield.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
android:layout_marginBottom = "10dp"
>
<com.google.android.material.textfield.TextInputEditText
android:id="@+id/tiEmail"
android:hint="@string/email"
android:drawableStart="@drawable/email"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</com.google.android.material.textfield.TextInputLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/descripcion_contacto"
android:textSize="18sp"
/>
<com.google.android.material.textfield.TextInputLayout
android:id="@+id/tiDescripcionContacto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
android:layout_marginBottom = "10dp"
>
<com.google.android.material.textfield.TextInputEditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</com.google.android.material.textfield.TextInputLayout>
<Button
android:id="@+id/Siguiente"
android:layout_width="match_parent"
android:layout_height="60dp"
android:text="@string/siguiente"
android:theme="@style/MiRaisebtn" />
</LinearLayout>
日志猫
06-27 10:22:51.000 7158-7158/com.niccode.desarrollounaapp D/dalvikvm: VFY: replacing opcode 0x6f at 0x0004
06-27 10:22:51.010 7158-7158/com.niccode.desarrollounaapp D/AndroidRuntime: Shutting down VM
06-27 10:22:51.010 7158-7158/com.niccode.desarrollounaapp W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x40afa930)
06-27 10:22:51.010 7158-7158/com.niccode.desarrollounaapp E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.niccode.desarrollounaapp/com.niccode.desarrollounaapp.MainActivity}: java.lang.ClassCastException: com.google.android.material.textfield.TextInputLayout cannot be cast to android.widget.EditText
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassCastException: com.google.android.material.textfield.TextInputLayout cannot be cast to android.widget.EditText
at com.niccode.desarrollounaapp.MainActivity.onCreate(MainActivity.java:29)
at android.app.Activity.performCreate(Activity.java:5131)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1090)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
06-27 10:22:53.420 7158-7158/com.niccode.desarrollounaapp I/Process: Sending signal. PID: 7158 SIG: 9
解决方案
它在这条线上崩溃：
final EditText eFecha = findViewById(R.id.Calendario);
在你的 XMLR.id.Calendario上TextInputLayout不是一个EditText所以它崩溃
您可以将 替换TextInputLayout为EditText
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