activitydiaryeditor.java

android开发入门与实践源代码

package com.eoeAndroid.contentProvider;

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

import com.eoeAndroid.contentProvider.Diary.DiaryColumns;

public class ActivityDiaryEditor extends Activity {
	private static final String TAG = "Diary";
	public static final String EDIT_DIARY_ACTION = "com.ex09_2_contentProvider.ActivityDiaryEditor.EDIT_DIARY";
	public static final String INSERT_DIARY_ACTION = "com.ex09_2_contentProvider.ActivityDiaryEditor.action.INSERT_DIARY";

	/**
	 * 查询cursor时候，感兴趣的那些条例。
	 */
	private static final String[] PROJECTION = new String[] { DiaryColumns._ID, // 0
			DiaryColumns.TITLE, DiaryColumns.BODY, // 1
	};

	private static final int STATE_EDIT = 0;
	private static final int STATE_INSERT = 1;

	private int mState;

	private Uri mUri;
	private Cursor mCursor;

	private EditText mTitleText;
	private EditText mBodyText;
	private Button confirmButton;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setTheme(android.R.style.Theme_Black);
		final Intent intent = getIntent();
		final String action = intent.getAction();
		setContentView(R.layout.diary_edit);
		
		mTitleText = (EditText) findViewById(R.id.title);
		mBodyText = (EditText) findViewById(R.id.body);
		confirmButton = (Button) findViewById(R.id.confirm);

		if (EDIT_DIARY_ACTION.equals(action)) {// 编辑日记
			mState = STATE_EDIT;
			mUri = intent.getData();
			mCursor = managedQuery(mUri, PROJECTION, null, null, null);
			mCursor.moveToFirst();
			String title = mCursor.getString(1);
			mTitleText.setTextKeepState(title);
			String body = mCursor.getString(2);
			mBodyText.setTextKeepState(body);
			setResult(RESULT_OK, (new Intent()).setAction(mUri.toString()));
			setTitle("编辑日记");
		} else if (INSERT_DIARY_ACTION.equals(action)) {// 新建日记
			mState = STATE_INSERT;
			setTitle("新建日记");
		} else {
			Log.e(TAG, "no such action error");
			finish();
			return;
		}

		confirmButton.setOnClickListener(new View.OnClickListener() {
			public void onClick(View view) {
				if (mState == STATE_INSERT) {
					insertDiary();
				} else {
					updateDiary();
				}
				Intent mIntent = new Intent();
				setResult(RESULT_OK, mIntent);
				finish();
			}

		});

	}

	private void insertDiary() {
		String title = mTitleText.getText().toString();
		String body = mBodyText.getText().toString();
		ContentValues values = new ContentValues();
		values.put(Diary.DiaryColumns.CREATED, DiaryContentProvider
				.getFormateCreatedDate());
		values.put(Diary.DiaryColumns.TITLE, title);
		values.put(Diary.DiaryColumns.BODY, body);
		getContentResolver().insert(Diary.DiaryColumns.CONTENT_URI, values);

	}

	private void updateDiary() {
		String title = mTitleText.getText().toString();
		String body = mBodyText.getText().toString();
		ContentValues values = new ContentValues();
		values.put(Diary.DiaryColumns.CREATED, DiaryContentProvider
				.getFormateCreatedDate());
		values.put(Diary.DiaryColumns.TITLE, title);
		values.put(Diary.DiaryColumns.BODY, body);
		getContentResolver().update(mUri, values,
				null, null);

	}
}