这部分代码是在单击secbutt按钮时添加3行EditText行。当所有三个 EditText 行都在屏幕上时，该按钮应该消失。
现在我不明白为什么进入 onClick 方法并启动 plusTextField 方法后，它只是无限地添加 EditText 行。我希望它执行一次并返回到 summonButton 方法的开头。我该怎么办？
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
public class MainActivity extends AppCompatActivity {
int numberOfLinesLeft = 3;
Button secondaryActivityAddButton;
LinearLayout llForSecondaryButton;
LinearLayout llForSecondaryEditText;
EditText et;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void summonButton(View view){
llForSecondaryButton = findViewById(R.id.secondaryButton);
secondaryActivityAddButton = new Button(this);
secondaryActivityAddButton.setText("" + numberOfLinesLeft);
llForSecondaryButton.addView(secondaryActivityAddButton);
secondaryActivityAddButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
plusTextField();
}
});
}
public void plusTextField() {
llForSecondaryEditText = findViewById(R.id.linearLayout1);
// add edittext
et = new EditText(this);
et.setText("text" + numberOfLinesLeft);
llForSecondaryEditText.addView(et);
numberOfLinesLeft--;
}
}
ActivityMain.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical"
tools:context="com.egrishin.task_a_day.MainActivity">
<LinearLayout
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_weight="1">
<TextView
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:text="@string/main_task_title"
android:gravity="center_horizontal"
/>
<EditText
android:id="@+id/main_task_line_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="What is 1 main thing to be done today?"
android:inputType="textMultiLine"
android:layout_margin="16dp"
/>
</LinearLayout>
<LinearLayout
android:id="@+id/linearLayout0"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:layout_weight="1"
android:orientation="vertical"
>
<TextView
android:id="@+id/textline2"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:text="@string/secondary_task_title"
android:gravity="center_horizontal"
android:onClick="summonButton"
/>
<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_margin="16dp"
>
</LinearLayout>
<LinearLayout
android:id="@+id/secondaryButton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_weight="1">
<TextView android:layout_height="wrap_content"
android:layout_width="match_parent"
android:text="@string/other_task_title"
android:gravity="center_horizontal"/>
</LinearLayout>
</LinearLayout>
最佳答案
您错过了当计数器丰富 0 时将按钮设置为不可见的逻辑:
public void onClick(View view) {
plusTextField();
if(numberOfLinesLeft == 0) {
view.setVisibility(View.GONE);
}
}
这是结果，添加3个编辑文本后没有按钮:
关于java - 不要从 onClickListener onClick 方法返回代码，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48781910/