Android example source code file (TitleEditor.java)

This example Android source code file (TitleEditor.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

activity, android, button, column_index_title, content, contentvalues, cursor, edit_title_action, edittext, net, network, override, projection, string, titleeditor, ui, uri, widget

The TitleEditor.java Android example source code

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.notepad;

import com.example.android.notepad.NotePad.Notes;

import android.app.Activity;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

/**
 * An activity that will edit the title of a note. Displays a floating
 * window with a text field.
 */
public class TitleEditor extends Activity implements View.OnClickListener {

    /**
     * This is a special intent action that means "edit the title of a note".
     */
    public static final String EDIT_TITLE_ACTION = "com.android.notepad.action.EDIT_TITLE";

    /**
     * An array of the columns we are interested in.
     */
    private static final String[] PROJECTION = new String[] {
            NotePad.Notes._ID, // 0
            NotePad.Notes.TITLE, // 1
    };
    /** Index of the title column */
    private static final int COLUMN_INDEX_TITLE = 1;

    /**
     * Cursor which will provide access to the note whose title we are editing.
     */
    private Cursor mCursor;

    /**
     * The EditText field from our UI. Keep track of this so we can extract the
     * text when we are finished.
     */
    private EditText mText;

    /**
     * The content URI to the note that's being edited.
     */
    private Uri mUri;

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

        setContentView(R.layout.title_editor);

        // Get the uri of the note whose title we want to edit
        mUri = getIntent().getData();

        // Get a cursor to access the note
        mCursor = managedQuery(mUri, PROJECTION, null, null, null);

        // Set up click handlers for the text field and button
        mText = (EditText) this.findViewById(R.id.title);
        mText.setOnClickListener(this);
        
        Button b = (Button) findViewById(R.id.ok);
        b.setOnClickListener(this);
    }

    @Override
    protected void onResume() {
        super.onResume();

        // Initialize the text with the title column from the cursor
        if (mCursor != null) {
            mCursor.moveToFirst();
            mText.setText(mCursor.getString(COLUMN_INDEX_TITLE));
        }
    }

    @Override
    protected void onPause() {
        super.onPause();

        if (mCursor != null) {
            // Write the title back to the note 
            ContentValues values = new ContentValues();
            values.put(Notes.TITLE, mText.getText().toString());
            getContentResolver().update(mUri, values, null, null);
        }
    }

    public void onClick(View v) {
        // When the user clicks, just finish this activity.
        // onPause will be called, and we save our data there.
        finish();
    }
}