[英]My App Closes on a button click
帮帮我,发现错误
请单击按钮,我的应用程序关闭
emp.XML
**XML file*
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/lawa"
tools:context="com.example.johnwalls.projet.Main2Activity">
<EditText
android:id="@+id/username"
android:layout_width="150dp"
android:layout_height="30dp"
android:ems="10"
android:inputType="textPersonName"
android:textSize="10dp"
android:background="#ffffffff"
android:textColor="#000"
android:textColorHighlight="#ffffffff"
android:phoneNumber="false"
android:text=""
style="@android:style/TextAppearance.Large"
android:textStyle="bold"
android:typeface="sans"
android:layout_marginBottom="90dp"
android:layout_alignBottom="@+id/pass"
android:layout_alignLeft="@+id/pass"
android:layout_alignStart="@+id/pass" />
android:text="" />
<EditText
android:id="@+id/pass"
android:layout_width="150dp"
android:layout_height="30dp"
android:ems="10"
android:inputType="textPassword"
android:textSize="10dp"
android:background="#ffffffff"
android:textColor="#000"
android:textColorHighlight="#ffffffff"
android:phoneNumber="false"
android:text=""
style="@android:style/TextAppearance.Large"
android:textStyle="bold"
android:typeface="sans"
android:layout_marginLeft="11dp"
android:layout_marginStart="11dp"
android:layout_centerVertical="true"
android:layout_alignLeft="@+id/log"
android:layout_alignStart="@+id/log" />
<Button
android:text=""
android:layout_width="105.0dp"
android:layout_height="40.0dp"
android:id="@+id/log"
android:background="@drawable/log"
android:layout_marginLeft="10dp"
android:layout_marginTop="340dp"
android:textAllCaps="false"
android:onClick=""
/>
<Button
android:text=""
android:layout_width="105.0dp"
android:layout_height="40.0dp"
android:background="@drawable/ins"
android:layout_marginLeft="120dp"
android:layout_marginTop="340dp"
android:textAllCaps="false"
android:onClick="goButtonClicked"
android:id="@+id/goButton"
/>
</RelativeLayout>`
Main2Activity.java
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
public class Main2Activity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.emp);
}
public void goButtonClicked(View v) {
Intent i=new Intent(Main2Activity.this,SaveadminActivity.class);
startActivity(i);
}
}
SaveadminActivity
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
public class SaveadminActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.enregistreradmin);
}
}
[enter image description here][1]
您正在尝试实现什么期望得到什么,您获得了什么(包括错误消息),您还尝试了什么? 您认为是什么原因引起的? 为什么您需要为此提出一个新问题? 为什么您的问题与此处的其他类似问题不同?
这是解决问题的方法
emp.XML
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/lawa"
tools:context="com.example.johnwalls.projet.Main2Activity">
<EditText
android:id="@+id/username"
android:layout_width="150dp"
android:layout_height="30dp"
android:ems="10"
android:inputType="textPersonName"
android:textSize="10dp"
android:background="#ffffffff"
android:textColor="#000"
android:textColorHighlight="#ffffffff"
android:phoneNumber="false"
android:text=""
style="@android:style/TextAppearance.Large"
android:textStyle="bold"
android:typeface="sans"
android:layout_marginBottom="90dp"
android:layout_alignBottom="@+id/pass"
android:layout_alignLeft="@+id/pass"
android:layout_alignStart="@+id/pass" />
android:text="" />
<EditText
android:id="@+id/pass"
android:layout_width="150dp"
android:layout_height="30dp"
android:ems="10"
android:inputType="textPassword"
android:textSize="10dp"
android:background="#ffffffff"
android:textColor="#000"
android:textColorHighlight="#ffffffff"
android:phoneNumber="false"
android:text=""
style="@android:style/TextAppearance.Large"
android:textStyle="bold"
android:typeface="sans"
android:layout_marginLeft="11dp"
android:layout_marginStart="11dp"
android:layout_centerVertical="true"
android:layout_alignLeft="@+id/log"
android:layout_alignStart="@+id/log" />
<Button
android:text=""
android:layout_width="105.0dp"
android:layout_height="40.0dp"
android:id="@+id/log"
android:background="@drawable/log"
android:layout_marginLeft="10dp"
android:layout_marginTop="340dp"
android:textAllCaps="false"
/>
<Button
android:text=""
android:layout_width="105.0dp"
android:layout_height="40.0dp"
android:background="@drawable/ins"
android:layout_marginLeft="120dp"
android:layout_marginTop="340dp"
android:textAllCaps="false"
android:id="@+id/goButton"
/>
</RelativeLayout>
Main2Activity.java
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
public class Main2Activity extends AppCompatActivity {
Button goButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.emp);
goButton=(Button)findViewById(R.id.goButton);
goButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i=new Intent(Main2Activity.this,SaveadminActivity.class);
startActivity(i);
}
});
}
}
在Main2Activity中删除goButton方法并添加到onCreate this
goButton=(Button)findViewById(R.id.goButton);
goButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i=new Intent(Main2Activity.this,SaveadminActivity.class);
startActivity(i);
}
});
Main2Activity看起来像这样
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
public class Main2Activity extends AppCompatActivity {
Button goButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.emp);
goButton=(Button)findViewById(R.id.goButton);
goButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i=new Intent(Main2Activity.this,SaveadminActivity.class);
startActivity(i);
}
});
}
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