ContentProvider使用完整示例(一)――自定义ContentProvider(一)

//以下为TestBaidu

MainActivity如下:

package cn.testbaidu;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.database.Cursor;
/**
 * Demo描述:
 * 应用A(TestBaidu)调用另外一个应用(TestContentProvider)
 * 中的自定义ContentProvider,即:
 * 1 自定义ContentProvider的使用
 * 2 其它应用调用该ContentProvider
 * 
 * 测试方法:
 * 1 依次测试ContentProvider的增查删改(注意该顺序)
 * 2 其它应用查询该ContentProvider的数据
 *
 */
public class MainActivity extends Activity {
	private Button mAddButton;
	private Button mDeleteButton;
	private Button mUpdateButton;
	private Button mQueryButton;
	private Button mTypeButton;
    private ContentResolver mContentResolver;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		init();
	}

	private void init() {
		mContentResolver=this.getContentResolver();
		
		mAddButton=(Button) findViewById(R.id.addButton);
		mAddButton.setOnClickListener(new ClickListenerImpl());
		
		mDeleteButton=(Button) findViewById(R.id.deleteButton);
		mDeleteButton.setOnClickListener(new ClickListenerImpl());
		
		mUpdateButton=(Button) findViewById(R.id.updateButton);
		mUpdateButton.setOnClickListener(new ClickListenerImpl());
		
		mQueryButton=(Button) findViewById(R.id.queryButton);
		mQueryButton.setOnClickListener(new ClickListenerImpl());
		
		mTypeButton=(Button) findViewById(R.id.typeButton);
		mTypeButton.setOnClickListener(new ClickListenerImpl());
		
	}

	private class ClickListenerImpl implements OnClickListener{
		@Override
		public void onClick(View v) {
			switch (v.getId()) {
			case R.id.addButton:
				Person person=null;
				for (int i = 0; i < 5; i++) {
					person=new Person("xiaoming"+i, "9527"+i,(8888+i));
					testInsert(person);
				}
				break;
			case R.id.deleteButton:
				testDelete(1);
					break;
			case R.id.updateButton:
				testUpdate(3);
					break;
			case R.id.queryButton:
				//查询表
				//queryFromContentProvider(-1);
				
				//查询personid=2的数据
				testQuery(2);
					break;
			case R.id.typeButton:
				testType();
					break;
			default:
				break;
			}
			
		}
		
	}
	private void testInsert(Person person) {
        ContentValues contentValues=new ContentValues();
        contentValues.put("name", person.getName());
        contentValues.put("phone", person.getPhone());
        contentValues.put("salary",person.getSalary());
        Uri insertUri=Uri.parse("content://cn.bs.testcontentprovider/person");
        Uri returnUri=mContentResolver.insert(insertUri, contentValues);
        System.out.println("新增数据:returnUri="+returnUri);
	}
	
	private void testDelete(int index){
		Uri uri=Uri.parse("content://cn.bs.testcontentprovider/person/"+String.valueOf(index));
		mContentResolver.delete(uri, null, null);
	}
	
	private void testUpdate(int index){
		Uri uri=Uri.parse("content://cn.bs.testcontentprovider/person/"+String.valueOf(index));
		ContentValues values=new ContentValues();
		values.put("name", "hanmeimei");
		values.put("phone", "1234");
		values.put("salary", 333);
		mContentResolver.update(uri, values, null, null);
	}

	private void testQuery(int index) {
		Uri uri=null;
		if (index<=0) {
			//查询表
			uri=Uri.parse("content://cn.bs.testcontentprovider/person");
		} else {
			 //按照id查询某条数据
			uri=Uri.parse("content://cn.bs.testcontentprovider/person/"+String.valueOf(index));
		}
		
		//对应上面的:查询表
		//Cursor cursor= mContentResolver.query(uri, null, null, null, null);
		
		//对应上面的:查询personid=2的数据
		//注意:因为name是varchar字段的,所以应该写作"name='xiaoming1'"
		//     若写成"name=xiaoming1"查询时会报错
		Cursor cursor= mContentResolver.query(uri, null, "name='xiaoming1'", null, null);
		
		while(cursor.moveToNext()){
			int personid=cursor.getInt(cursor.getColumnIndex("personid"));
			String name=cursor.getString(cursor.getColumnIndex("name"));
			String phone=cursor.getString(cursor.getColumnIndex("phone"));
			int salary=cursor.getInt(cursor.getColumnIndex("salary"));
			System.out.println("查询得到:personid=" + personid+",name="+name+",phone="+phone+",salary="+salary);
		}
		cursor.close();
	}
	
	private void testType(){
		Uri dirUri=Uri.parse("content://cn.bs.testcontentprovider/person");
	    String dirType=mContentResolver.getType(dirUri);
	    System.out.println("dirType:"+dirType);
	    
	    Uri itemUri=Uri.parse("content://cn.bs.testcontentprovider/person/3");
	    String itemType=mContentResolver.getType(itemUri);
	    System.out.println("itemType:"+itemType);
	}

}

package cn.testbaidu;

public class Person {
	private Integer id;
	private String name;
	private String phone;
	private Integer salary;
	public Person(String name, String phone,Integer salary) {
		this.name = name;
		this.phone = phone;
		this.salary=salary;
	}
	public Person(Integer id, String name, String phone,Integer salary) {
		this.id = id;
		this.name = name;
		this.phone = phone;
		this.salary=salary;
	}
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPhone() {
		return phone;
	}
	public void setPhone(String phone) {
		this.phone = phone;
	}
	public Integer getSalary() {
		return salary;
	}
	public void setSalary(Integer salary) {
		this.salary = salary;
	}
	@Override
	public String toString() {
		return "Person [id=" + id + ", name=" + name + ", phone=" + phone+ ", salary=" + salary + "]";
	}
	
	
	
}

//以下为TestContentProvider

MainActivity如下:

package cn.testcontentprovider;
import android.app.Activity;
import android.os.Bundle;
public class MainActivity extends Activity {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
	}

}