在条件下显示EditText

时间:2014-07-30 04:43:54

标签: android android-edittext logic generated-code

现在我有一个项目的想法,我想知道是否有人可以帮助我同样的逻辑。

因此我需要根据您输入的金额创建或生成一些EditText,即选择或输入一个数字,例如5,为5类值显示5 EditText布局。他们知道表格可以做到这一点吗?有什么想法吗?

我想它必须是一种用循环来实现它的方法,但不像把这个计算Java带到XML那样。谢谢。

1 个答案:

答案 0 :(得分:0)

以下是根据您输入的数字生成EditText项目的示例。您可以忽略布局文件中的滚动视图,我只是将其添加到有人添加了很多将离开屏幕的EditText项目。

MainActivity.java

package com.example.test;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.TextView;

public class MainActivity extends Activity {

    public static final String TAG = MainActivity.class.getSimpleName();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final EditText count = (EditText) findViewById(R.id.count);
        final TextView output = (TextView) findViewById(R.id.output);
        final Button generate = (Button) findViewById(R.id.generate);
        final Button values = (Button) findViewById(R.id.values);
        final LinearLayout container = (LinearLayout) findViewById(R.id.container);

        generate.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                int numberOfControlsToGenerate = 0;

                try {
                    numberOfControlsToGenerate = Integer.parseInt(count.getText().toString().trim());
                } catch (NumberFormatException e) {
                    Log.e(TAG, e.getMessage(), e);
                }

                if (numberOfControlsToGenerate > 0) {

                    if (container.getChildCount() > 0) {
                        container.removeAllViews();
                    }

                    for (int counter = 0; counter < numberOfControlsToGenerate; counter++) {
                        addEditText(container);
                    }
                }
            }
        });

        values.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {

                String[] editTextValues = new String[container.getChildCount()];

                StringBuilder editTextValuesBuilder = new StringBuilder();

                for (int counter = 0; counter < container.getChildCount(); counter++) {
                    EditText child = (EditText) container.getChildAt(counter);
                    editTextValues[counter] = child.getText().toString().trim();
                    editTextValuesBuilder.append(editTextValues[counter]).append("\n");
                }

                output.setText(editTextValuesBuilder.toString());
            }
        });
    }

    private void addEditText(LinearLayout container) {
        final LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
        EditText editTextToAdd = new EditText(this);
        editTextToAdd.setLayoutParams(params);
        container.addView(editTextToAdd);
    }
}

activity_main.xml中

<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:gravity="center_horizontal"
    android:orientation="vertical"
    android:padding="16dp"
    tools:context="${packageName}.${activityClass}" >

    <EditText
        android:id="@+id/count"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:imeOptions="actionDone"
        android:inputType="number"
        android:textSize="20sp" />

    <Button
        android:id="@+id/generate"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Go" />

    <Button
        android:id="@+id/values"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Get Values" />

    <TextView
        android:id="@+id/output"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <LinearLayout
            android:id="@+id/container"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical" >
        </LinearLayout>
    </ScrollView>

</LinearLayout>