为什么'不幸的是我的应用程序已停止'在Android模拟器中出现 [英] Why 'unfortunately my application has stopped ' in android emulator is appearing
本文介绍了为什么'不幸的是我的应用程序已停止'在Android模拟器中出现的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我的应用程序正常工作，并出现在模拟器的屏幕上。我为num1和num2得到2个数字并使用'添加'按钮并在'回答'中显示答案。我可以在num1中输入一个数字但是无法输入num2，因为我无法将光标放在num2上。
如果我点击添加按钮它抛出一个错误，说不幸的是app停止工作。在设计模式中，我检查了'clickable'属性，在'onClick'中我也选择了'onButtonClick'。
public class MainActivity extends 活动{
@覆盖
protected void onCreate（Bundle savedInstanceState）{
super .onCreate（savedInstanceState）;
setContentView（R.layout.activity_main）;
}
public void onButtonClick（查看v）
{
int n1，n2，ans = 0;
EditText e1 =（EditText）findViewById（R.id.num1）;
EditText e2 =（EditText）findViewById（R.id.num2）;
TextView view_answer =（TextView）findViewById（R.id.answer）;
n1 = Integer.parseInt（e1.getText（）。toString（））;
n2 = Integer.parseInt（e2.getText（）。toString（））;
ans = n1 + n2;
view_answer.setText（Integer.toString（ans））;
}
@覆盖
public boolean onCreateOptionsMenu（菜单菜单）{
// 膨胀菜单;如果项目存在，则会将项目添加到操作栏。
getMenuInflater（）。inflate（R.menu.menu_main，menu）;
返回 true;
}
}
< ; 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>
< Button
android：layout_width =wrap_content
android：layout_height =wrap_content
android：text =Add
android： id =@ + id / add
android：layout_centerVertical =true
android：layout_centerHorizontal =true
android：clickable =true
android：nestedScrollingEnabled = 假
android：/>
< textview>
android：layout_width =wrap_content
android：layout_height =wrap_content
android：textAppearance =？android：attr / textAppearanceLarge
android：id = @ + id / answer
android：layout_alignParentBottom =true
android：layout_centerHorizontal =true
android：layout_marginBottom =90dp
android：width =123dp
android：removed =＃ffcbffff/>
< edittext>
android：layout_width =wrap_content
android：layout_height =wrap_content
android：id =@ + id / num1
android：layout_alignParentTop =true
android：layout_alignRight =@ + id / add
android：layout_alignEnd =@ + id / add
android：layout_marginTop =45dp
android：width =65dp
android：removed =＃fffeffa0/>
< edittext>
android：layout_width =wrap_content
android：layout_height =wrap_content
android：id =@ + id / num2
android：width =65dp
android：removed =＃ffffa6f0
android：layout_below =@ + id / num1
android：layout_centerHorizontal =true
android：textSize =20dp
android：textIsSelectable =true
android：height =45dp
android：layout_marginTop =88dp/>
< / edittext>< / edittext>< / textview>< / relativelayout>
< resources>
< string name =app_name>我的应用程序< / string>
< string name =hello_world> Hello world！< / string>
< string name =action_settings>设置< / string>
< string name =title_activity_main> MainActivity< / string>
< string name =num1>< / string>
< string name =num2>< / string>
< string name =answer>< / string>
< string name =add>添加< / string>
< / resources>
解决方案
不幸，activity_main.xml一团糟，除其他外，还有不正确形成的标签，无效的属性和错误的字母大小写。更改为：
< RelativeLayout xmlns：android = http://schemas.android.com/apk/res/android
xmlns：tools = http://schemas.android.com/tools
android：lay out_width = match_parent
android：layout_height = match_parent
tools：context = 。MainActivity >
< 按钮
android：id = @ + id / add
android：layout_width = wrap_content
android：layout_height = wrap_content
android：layout_centerHorizontal = true
android：layout_centerVertical = true
android：/ >
< TextView
android：id = @ + id / answer
android：layout_width = wrap_content
android：layout_height = wrap_content
android：layout_alignParentBottom = < span class =code-keyword> true
< span class =code-attribute> android：layout_centerHorizontal = true
android：layout_marginBottom = 90dp
android：width < span class =code-keyword> = 123dp
< span class =code-attribute>
android：textAppearance = ？android：attr / textAppearanceLarge / >
< EditText
android：id = @ + id / num1
< span class =code-attribute> android：layout_width = wrap_content
android： layout_height = wrap_content
< span class =code-attribute> android：layout_alignEnd = @ + id / add
android：layout_alignParentTop = true
android：layout_alignRight = @ + id / add
android：layo ut_marginTop = 45dp
android：width = 65dp / >
< < span class =code-leadattribute> EditText
< span class =code-attribute> android：id = @ + id / num2
android：layout_width = wrap_content
android：layout_height = wrap_content
android：layout_below = @ + id / num1
android：layout_centerHorizontal = true
android：layout_marginTop = 88dp
android：width = 65dp
android：height = 45dp
android：textSize = 20dp / >
< / RelativeLayout >
无法编辑num2edittext的原因是包含android：textIsSelectable =true
参考： Android UI布局和控件
这应该可以解决您的问题。
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My App works and appears on the screen in the emulator. I get 2 numbers for num1 and num2 and use the 'Add' button and show the answer in 'answer'. I am able to enter a number in num1 but unable to enter for num2 as I could not place the cursor on num2.
If I click the 'Add' button it throws an error stating 'unfortunately app stopped working'. In the design mode I have checked the 'clickable' property and in 'onClick' I have also selected the 'onButtonClick'.
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void onButtonClick(View v)
{
int n1,n2,ans=0;
EditText e1=(EditText) findViewById(R.id.num1);
EditText e2=(EditText) findViewById(R.id.num2);
TextView view_answer=(TextView) findViewById(R.id.answer);
n1=Integer.parseInt(e1.getText().toString());
n2=Integer.parseInt(e2.getText().toString());
ans=n1+n2;
view_answer.setText(Integer.toString (ans));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
}
<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" >
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add "
android:id="@+id/add"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:clickable="true"
android:nestedScrollingEnabled="false"
android:/>
<textview>
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:id="@+id/answer"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="90dp"
android:width="123dp"
android:removed="#ffcbffff" />
<edittext>
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/num1"
android:layout_alignParentTop="true"
android:layout_alignRight="@+id/add"
android:layout_alignEnd="@+id/add"
android:layout_marginTop="45dp"
android:width="65dp"
android:removed="#fffeffa0" />
<edittext>
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/num2"
android:width="65dp"
android:removed="#ffffa6f0"
android:layout_below="@+id/num1"
android:layout_centerHorizontal="true"
android:textSize="20dp"
android:textIsSelectable="true"
android:height="45dp"
android:layout_marginTop="88dp" />
</edittext></edittext></textview></relativelayout>
<resources>
<string name="app_name">My Application</string>
<string name="hello_world">Hello world!</string>
<string name="action_settings">Settings</string>
<string name="title_activity_main">MainActivity</string>
<string name="num1"></string>
<string name="num2"></string>
<string name="answer"></string>
<string name="add">Add</string>
</resources> 解决方案
"Unfortunately", the activity_main.xml is in a mess, among other things, there are improperly formed tags, invalid attributes, and wrong letter case. Change to this:
<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" tools:context=".MainActivity"> <Button android:id="@+id/add" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:/> <TextView android:id="@+id/answer" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_centerHorizontal="true" android:layout_marginBottom="90dp" android:width="123dp" android:textAppearance="?android:attr/textAppearanceLarge" /> <EditText android:id="@+id/num1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignEnd="@+id/add" android:layout_alignParentTop="true" android:layout_alignRight="@+id/add" android:layout_marginTop="45dp" android:width="65dp" /> <EditText android:id="@+id/num2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/num1" android:layout_centerHorizontal="true" android:layout_marginTop="88dp" android:width="65dp" android:height="45dp" android:textSize="20dp" /> </RelativeLayout>
The reason for not being able to edit "num2" edittext is the inclusion ofandroid:textIsSelectable="true"
Refer: Android UI Layouts and Controls
That should solve your problems.
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