Question

我正在做一个Android应用程序。因为我想创建像dynamic controls(edittext)这样的android核心contacts应用程序。在ediitext中输入数据后，我想通过单击名为save的按钮将数据保存到sqlite数据库。由于Iam是android的新手，我不知道创建动态控件并存储其行值。如果有人知道，请帮助我。

我的代码：

package com.xiaochaoyang.dynamicviews;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.LinearLayout;

public class MainActivity extends Activity {

    // Parent view for all rows and the add button.
    private LinearLayout mContainerView;
    // The "Add new" button
    private Button mAddButton;

    // There always should be only one empty row, other empty rows will
    // be removed.
    private View mExclusiveEmptyView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.row_container);

        mContainerView = (LinearLayout) findViewById(R.id.parentView);
        mAddButton = (Button) findViewById(R.id.btnAddNewItem);

        // Add some examples
        inflateEditRow("Xiaochao");
        inflateEditRow("Yang");
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);

        // TODO: Handle screen rotation:
        // encapsulate information in a parcelable object, and save it
        // into the state bundle.

    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        // TODO: Handle screen rotation:
        // restore the saved items and inflate each one with inflateEditRow;

    }

    // onClick handler for the "Add new" button;
    public void onAddNewClicked(View v) {
        // Inflate a new row and hide the button self.
        inflateEditRow(null);
        //v.setVisibility(View.GONE);
    }

    // onClick handler for the "X" button of each row
    public void onDeleteClicked(View v) {
        // remove the row by calling the getParent on button
        mContainerView.removeView((View) v.getParent());            
    }

    // Helper for inflating a row
    private void inflateEditRow(String name) {

        LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        final View rowView = inflater.inflate(R.layout.row, null);
        final ImageButton deleteButton = (ImageButton) rowView
                .findViewById(R.id.buttonDelete);
        final EditText editText = (EditText) rowView
                .findViewById(R.id.editText);


        if (name != null && !name.isEmpty()) {
            editText.setText(name);
        } else {
            mExclusiveEmptyView = rowView;
            //deleteButton.setVisibility(View.INVISIBLE);
        }

        // A TextWatcher to control the visibility of the "Add new" button and
        // handle the exclusive empty view.
        editText.addTextChangedListener(new TextWatcher() {

            @Override
            public void afterTextChanged(Editable s) {

                if (s.toString().isEmpty()) {
                    //mAddButton.setVisibility(View.GONE);
                    //deleteButton.setVisibility(View.INVISIBLE);

                    if (mExclusiveEmptyView != null
                            && mExclusiveEmptyView != rowView) {
                        mContainerView.removeView(mExclusiveEmptyView);
                    }
                    mExclusiveEmptyView = rowView;
                } else {

                    if (mExclusiveEmptyView == rowView) {
                        mExclusiveEmptyView = null;
                    }

                    mAddButton.setVisibility(View.VISIBLE);
                    deleteButton.setVisibility(View.VISIBLE);
                }
            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count,
                    int after) {
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before,
                    int count) {
            }
        });

        // Inflate at the end of all rows but before the "Add new" button
        mContainerView.addView(rowView, mContainerView.getChildCount() );
    }
}

我的布局：

Row Cointainer.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/parentView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:animateLayoutChanges="true"
    android:orientation="vertical" >

   <ScrollView
        android:id="@+id/ScrollView01"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >

    <Button
        android:id="@+id/btnAddNewItem"
        android:layout_width="21dp"
        android:layout_height="wrap_content"
        android:background="@drawable/transparent_background"
        android:gravity="center_vertical"
        android:onClick="onAddNewClicked"
        android:layout_gravity="right"
        android:paddingLeft="5dp"
        android:text="+"
        android:textColor="@android:color/black" />
  </ScrollView>
</LinearLayout>

Row.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:orientation="horizontal" >

    <EditText
        android:id="@+id/editText"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:singleLine="true"
        android:ems="10"
        android:hint="" >
        <requestFocus />
    </EditText>

    <Spinner
        android:id="@+id/spinnerCategory"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="0.15"
        android:entries="@array/categories"
        android:gravity="right" />

    <ImageButton
        android:id="@+id/buttonDelete"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:src="@drawable/content_remove" 
        android:background="@drawable/transparent_background"
        android:contentDescription="@string/button_delete_row_description"
        android:onClick="onDeleteClicked"/>

</LinearLayout>

Answer 1

首先，在SO中发布您的问题时，请显示您目前为止尝试的内容，如果您的应用程序被强制关闭，请发布您的logcat。

要使用控件，请参阅http://developer.android.com/reference/packages.html 在那里，您可以找到可用于控件的方法。

点击此链接：http://www.androidhive.info/2011/11/android-sqlite-database-tutorial/ 它有助于在SQLite数据库上学习和执行CRUD操作。

最后，你剩下的是，从控件获取数据（或输入），并插入到数据库中。

另外，请去谷歌搜索。

如何在sqlite中创建动态控件并存储值？

1 个答案: