Java Textview未显示该字符串
我在这里有一段代码,可以根据一个动作按钮上的音节生成一个随机名称。但是作为字符串currentName生成的名称确实显示在textview中。我需要将视图设置为自己的类还是什么?我是来自eclipse的androidstudio新手,所以文本视图对我来说是新手。谢谢Java Textview未显示该字符串,java,android,android-studio,Java,Android,Android Studio,我在这里有一段代码,可以根据一个动作按钮上的音节生成一个随机名称。但是作为字符串currentName生成的名称确实显示在textview中。我需要将视图设置为自己的类还是什么?我是来自eclipse的androidstudio新手,所以文本视图对我来说是新手。谢谢 public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState)
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = findViewById(R.id.fab);
TextView myTextView = (TextView) findViewById(R.id.view);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
class NewName {
String[] firstNameSyllables = new String[] { "mon", "fay", "shi", "zag", "blarg", "rash", "izen" };
String[] lastNameSyllables = new String[] { "malo", "zak", "abo", "wonk" };
public String createNewFirstName() {
String firstName = "";
int numberOfSyllablesInFirstName = randomRange(2, 4);
for (int i = 0; i < numberOfSyllablesInFirstName; i++) {
firstName += firstNameSyllables[randomRange(0, firstNameSyllables.length)];
}
String firstNameLetter = "";
firstNameLetter = firstName.substring(0, 1);
firstName = firstName.substring(1);
firstNameLetter = firstNameLetter.toUpperCase();
firstName = firstNameLetter + firstName;
return firstName;
}
public String createNewName() {
String firstName = "";
int numberOfSyllablesInFirstName = randomRange(2, 4);
for (int i = 0; i < numberOfSyllablesInFirstName; i++) {
firstName += firstNameSyllables[randomRange(0, firstNameSyllables.length)];
}
String firstNameLetter = "";
firstNameLetter = firstName.substring(0, 1);
firstName = firstName.substring(1);
firstNameLetter = firstNameLetter.toUpperCase();
firstName = firstNameLetter + firstName;
String lastName = "";
int numberOfSyllablesInLastName = randomRange(1, 3);
for (int j = 0; j < numberOfSyllablesInLastName; j++) {
lastName += lastNameSyllables[randomRange(0, lastNameSyllables.length)];
}
String lastNameLetter = "";
lastNameLetter = lastName.substring(0, 1);
lastName = lastName.substring(1);
lastNameLetter = lastNameLetter.toUpperCase();
lastName = lastNameLetter + lastName;
String currentName = firstName + " " + lastName;
myTextView.setText(currentName);
return currentName;
}
public int randomRange(int min, int max) {
Random random = new Random();
return random.nextInt(max - min) + min;
}
}
}
});
}
public类MainActivity扩展了AppCompatActivity{
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar Toolbar=findviewbyd(R.id.Toolbar);
设置支持操作栏(工具栏);
FloatingActionButton fab=findViewById(R.id.fab);
TextView myTextView=(TextView)findViewById(R.id.view);
fab.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图){
类NewName{
String[]firstNameSyllables=新字符串[]{“mon”、“fay”、“shi”、“zag”、“blarg”、“rash”、“izen”};
字符串[]lastNameSyllables=新字符串[]{“malo”、“zak”、“abo”、“wonk”};
公共字符串createNewFirstName(){
字符串firstName=“”;
int numberOfSydellesInfirstName=随机范围(2,4);
for(int i=0;i
}
这是我的活动_main.xml
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"
tools:context=".MainActivity">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/Theme.NameGenerator.AppBarOverlay">
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/Theme.NameGenerator.PopupOverlay" />
</com.google.android.material.appbar.AppBarLayout>
<include layout="@layout/content_main" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|center|center_horizontal|end"
android:layout_margin="@dimen/fab_margin"
android:contentDescription="@string/make_a_name_appear"
android:rotationY="178"
app:srcCompat="@drawable/abc_vector_test" />
<TextView
android:id="@+id/view"
android:layout_width="201dp"
android:layout_height="67dp"
android:translationX="150dp"
android:translationY="500dp" />
xmlns:app=”http://schemas.android.com/apk/res-auto"
xmlns:tools=”http://schemas.android.com/tools"
android:layout\u width=“匹配父项”
android:layout\u height=“match\u parent”
工具:context=“.MainActivity”>
单击将您的新名称
类从中拉出,然后创建其实例,然后访问该方法。因此,您的main活动
看起来像这样
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = findViewById(R.id.fab);
TextView myTextView = (TextView) findViewById(R.id.view);
//create instance
NewName newName = new NewName();
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//call method and set text
myTextView.setText(newName.createNewName());
}
});
}
class NewName {
String[] firstNameSyllables = new String[]{"mon", "fay", "shi", "zag", "blarg", "rash", "izen"};
String[] lastNameSyllables = new String[]{"malo", "zak", "abo", "wonk"};
public String createNewFirstName() {
String firstName = "";
int numberOfSyllablesInFirstName = randomRange(2, 4);
for (int i = 0; i < numberOfSyllablesInFirstName; i++) {
firstName += firstNameSyllables[randomRange(0, firstNameSyllables.length)];
}
String firstNameLetter = "";
firstNameLetter = firstName.substring(0, 1);
firstName = firstName.substring(1);
firstNameLetter = firstNameLetter.toUpperCase();
firstName = firstNameLetter + firstName;
return firstName;
}
public String createNewName() {
String firstName = "";
int numberOfSyllablesInFirstName = randomRange(2, 4);
for (int i = 0; i < numberOfSyllablesInFirstName; i++) {
firstName += firstNameSyllables[randomRange(0, firstNameSyllables.length)];
}
String firstNameLetter = "";
firstNameLetter = firstName.substring(0, 1);
firstName = firstName.substring(1);
firstNameLetter = firstNameLetter.toUpperCase();
firstName = firstNameLetter + firstName;
String lastName = "";
int numberOfSyllablesInLastName = randomRange(1, 3);
for (int j = 0; j < numberOfSyllablesInLastName; j++) {
lastName += lastNameSyllables[randomRange(0, lastNameSyllables.length)];
}
String lastNameLetter = "";
lastNameLetter = lastName.substring(0, 1);
lastName = lastName.substring(1);
lastNameLetter = lastNameLetter.toUpperCase();
lastName = lastNameLetter + lastName;
String currentName = firstName + " " + lastName;
return currentName;
}
public int randomRange(int min, int max) {
Random random = new Random();
return random.nextInt(max - min) + min;
}
}
}
您必须调用createNewName()方法来设置textview上的文本。顺便说一句,不要在onClick方法中创建类。
<TextView
android:id="@+id/view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text="cdc"
android:textColor="#a00" />