初学Android,使用ContentResolver获取自己实现的ContentProvider的数据(五十六)

下面的例子是使用ContentResolver获取自己实现的ContentProvider的数据

界面和上一篇相同

下面是主界面

package WangLi.IO.DictResolver;import java.util.ArrayList;import java.util.HashMap;import java.util.Map;import android.app.Activity;import android.content.ContentResolver;import android.content.ContentValues;import android.content.Intent;import android.database.Cursor;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class DictResolver extends Activity{ContentResolver contentResolver;Button insert = null;Button search = null;@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main);// 获取系统的ContentResolver对象contentResolver = getContentResolver();insert = (Button)findViewById(R.id.insert);search = (Button)findViewById(R.id.search);// 为insert按钮的单击事件绑定事件监听器insert.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View source){//获取用户输入String word = ((EditText)findViewById(R.id.word)).getText().toString();String detail = ((EditText)findViewById(R.id.detail)).getText().toString();//插入生词记录ContentValues values = new ContentValues();values.put(Words.Word.WORD , word);values.put(Words.Word.DETAIL , detail);contentResolver.insert(Words.Word.DICT_CONTENT_URI , values);//显示提示信息Toast.makeText(DictResolver.this, "添加生词成功！" , 8000).show();}});// 为search按钮的单击事件绑定事件监听器search.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View source){// 获取用户输入String key = ((EditText) findViewById(R.id.key)).getText().toString();// 执行查询Cursor cursor = contentResolver.query(Words.Word.DICT_CONTENT_URI, null , "word like ? or detail like ?", new String[]{"%" + key + "%" , "%" + key + "%"} , null);//创建一个Bundle对象Bundle data = new Bundle();data.putSerializable("data", converCursorToList(cursor));//创建一个IntentIntent intent = new Intent(DictResolver.this, ResultActivity.class);intent.putExtras(data);//启动ActivitystartActivity(intent);}});}private ArrayList<Map<String, String>> converCursorToList(Cursor cursor){ArrayList<Map<String, String>> result = new ArrayList<Map<String, String>>();// 遍历Cursor结果集while (cursor.moveToNext()){// 将结果集中的数据存入ArrayList中Map<String, String> map = new HashMap<String, String>();// 取出查询记录中第2列、第3列的值map.put(Words.Word.WORD, cursor.getString(1));map.put(Words.Word.DETAIL, cursor.getString(2));result.add(map);}return result;}}

注意这两处代码，使用了Uri作为参数

 contentResolver.insert(Words.Word.DICT_CONTENT_URI , values);   Cursor cursor = contentResolver.query(                      Words.Word.DICT_CONTENT_URI, null                       , "word like ? or detail like ?"                      , new String[]{"%" + key + "%" , "%" + key + "%"}                       , null);