该应用程序突然关闭,只要登录按钮,pressed [英] The app closes abruptly as soon as Login Button is pressed
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问题描述
我是一个新手,Android和我构建了一个小app.But应用说,当我preSS登录按钮它没有响应,请帮我解决这个错误倒闭
清单code
<?XML版本=1.0编码=UTF-8&GT?;
<清单的xmlns:机器人=http://schemas.android.com/apk/res/android
包=com.example.firstapp
安卓版code =1
机器人:=的versionName1.0> <用途-SDK
安卓的minSdkVersion =8
机器人:targetSdkVersion =17/> <应用
机器人:allowBackup =真
机器人:图标=@绘制/ ic_launcher
机器人:标签=@字符串/ APP_NAME
机器人:主题=@风格/ Theme.Base.AppCompat.Light.DarkActionBar>
<活动
机器人:名字=。MainActivity
机器人:标签=@字符串/ title_activity_main>
&所述;意图滤光器>
<作用机器人:名字=android.intent.action.MAIN/> <类机器人:名字=android.intent.category.LAUNCHER/>
&所述; /意图滤光器>
< /活性GT;
<活动
机器人:二NAME =
机器人:标签=@字符串/ title_activity_second>
< /活性GT;
<活动
机器人:注册NAME =
机器人:标签=@字符串/ title_activity_registration>
< /活性GT;
< /用途>< /清单>
MainActivity_java
包com.example.firstapp;进口com.example.firstapp.R;
进口android.app.Activity;
进口android.content.Intent;
进口android.os.Bundle;
进口android.view.Menu;
进口android.view.MenuItem;
进口android.view.View;
进口android.widget.Button;公共类MainActivity延伸活动{ @覆盖
保护无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_main);
最后Button按钮=(按钮)findViewById(R.id.button_id);
button.setOnClickListener(新View.OnClickListener(){
公共无效的onClick(视图v){
意图I =新意图(MainActivity.this,Second.class);
startActivity(ⅰ);
}
});
最后的按钮按钮2 =(按钮)findViewById(R.id.button2_id);
button2.setOnClickListener(新View.OnClickListener(){
公共无效的onClick(视图v){
意向J =新意图(MainActivity.this,Registration.class);
startActivity(J);
}
});
}
}
Second.java
包com.example.firstapp; 进口android.os.Bundle;
进口android.support.v7.app.ActionBarActivity;
进口android.view.View;
进口android.widget.AdapterView;
进口android.widget.AdapterView.OnItemSelectedListener;
进口android.widget.ArrayAdapter;
进口android.widget.Spinner;
进口android.widget.Toast;
公共类二扩展ActionBarActivity实现OnItemSelectedListener {@覆盖
保护无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_main);
微调微调=(微调)findViewById(R.id.spinner1);
spinner.setOnItemSelectedListener(本);
//使用字符串数组和默认微调布局的ArrayAdapter
ArrayAdapter<&CharSequence的GT;适配器= ArrayAdapter.createFromResource(这一点,
R.array.food_array,android.R.layout.simple_spinner_item);
//指定布局使用出现的选项列表时,
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
//应用适配器微调
spinner.setAdapter(适配器);
}
@覆盖
公共无效onItemSelected(适配器视图<>母公司,观景,INT位置,长的id){
字符串项= parent.getItemAtPosition(位置)的ToString(); //显示选择微调项目
Toast.makeText(parent.getContext(),选择:+项目,Toast.LENGTH_LONG).show();}
@覆盖
公共无效onNothingSelected(适配器视图<>母公司){
// code
}
}
解决方案
MainActivity_java
包com.example.firstapp;
进口android.view.View.OnClickListener;
进口android.app.Activity;
进口android.content.Intent;
进口android.os.Bundle;
进口android.view.Menu;
进口android.view.MenuItem;
进口android.view.View;
进口android.widget.Button; 公共类MainActivity延伸活动{
Button按钮,按钮2; @覆盖
保护无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_main);
按钮=(按钮)findViewById(R.id.button_id);
按钮2 =(按钮)findViewById(R.id.button2_id);
setButtonOnClickListeners();
}
私人无效setButtonOnClickListeners(){
button.setOnClickListener(新OnClickListener(){
公共无效的onClick(视图v){
意图I =新意图(MainActivity.this,Second.class);
startActivity(ⅰ);
}
}); button2.setOnClickListener(新OnClickListener(){
公共无效的onClick(视图v){
意向J =新意图(MainActivity.this,Registration.class);
startActivity(J);
}
});
}
}
I'm a newbie to android and I constructed a small app.But the app closes down by saying its not responding when I press the login button,please help me out in solving this error
Manifest Code
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.firstapp"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/Theme.Base.AppCompat.Light.DarkActionBar" >
<activity
android:name=".MainActivity"
android:label="@string/title_activity_main" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Second"
android:label="@string/title_activity_second" >
</activity>
<activity
android:name=".Registration"
android:label="@string/title_activity_registration" >
</activity>
</application>
</manifest>
MainActivity_java
package com.example.firstapp;
import com.example.firstapp.R;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Button button = (Button) findViewById(R.id.button_id);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent i = new Intent(MainActivity.this,Second.class);
startActivity(i);
}
});
final Button button2=(Button) findViewById(R.id.button2_id);
button2.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent j = new Intent(MainActivity.this,Registration.class);
startActivity(j);
}
});
}
}
Second.java
package com.example.firstapp;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;
public class Second extends ActionBarActivity implements OnItemSelectedListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Spinner spinner = (Spinner) findViewById(R.id.spinner1);
spinner.setOnItemSelectedListener(this);
// Create an ArrayAdapter using the string array and a default spinner layout
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
R.array.food_array, android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
spinner.setAdapter(adapter);
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position,long id) {
String item = parent.getItemAtPosition(position).toString();
// Showing selected spinner item
Toast.makeText(parent.getContext(), "Selected: " + item, Toast.LENGTH_LONG).show();
}
@Override
public void onNothingSelected (AdapterView<?> parent) {
// code
}
}
解决方案
MainActivity_java
package com.example.firstapp;
import android.view.View.OnClickListener;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
public class MainActivity extends Activity {
Button button, button2 ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.button_id);
button2 = (Button) findViewById(R.id.button2_id);
setButtonOnClickListeners();
}
private void setButtonOnClickListeners(){
button.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
Intent i = new Intent(MainActivity.this,Second.class);
startActivity(i);
}
});
button2.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
Intent j = new Intent(MainActivity.this,Registration.class);
startActivity(j);
}
});
}
}
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