Android使用contentprovide实现对其他应用数据库的读写

来源：互联网发布：linux压缩文件夹zip 编辑：程序博客网时间：2024/05/21 19:42

不废话，贴代码，记笔记，都懂。

当然，权限不能少： <uses-permission android:name="android.permission.READ_CONTACTS"/>

public class MainActivity extends Activity {

   private static final String URISTRING_NOTES = "content://com.zdsoft.notesProvider/notes";

   private ListView listview_note;
   private Button bt_add;
   private Button bt_search;
   private EditText et_id;
   private EditText et_title;
   private EditText et_content;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        init();

        loadListView();

        bt_add.setOnClickListener(new OnClickListener() {

           @Override
           public void onClick(View arg0) {
               ContentResolver contentResolver = getContentResolver();
                Uri insertUri = Uri.parse(URISTRING_NOTES);
                ContentValues values = new ContentValues();
                values.put("title", et_title.getText().toString());
                values.put("content", et_content.getText().toString());

                SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
                values.put("times", df.format(new Date()));

                Uri uri = contentResolver.insert(insertUri, values);

                Toast.makeText(MainActivity.this, "添加成功，新id为："+ContentUris.parseId(uri), Toast.LENGTH_LONG).show();
                loadListView();
               clearEditTextValue();
           }
       });

        bt_search.setOnClickListener(new OnClickListener() {

           @Override
           public void onClick(View arg0) {
               Cursor cursor=getDataItem();
               if(cursor!=null){
                   if(cursor.moveToFirst()){
                       int id = cursor.getInt(cursor.getColumnIndex("_id"));
                       String title = cursor.getString(cursor.getColumnIndex("title"));
                       String content = cursor.getString(cursor.getColumnIndex("content"));
                       et_id.setText(String.valueOf(id));
                       et_title.setText(title);
                       et_content.setText(content);
                    }
               }
           }
       });
    }

    private void init(){
       listview_note=(ListView)findViewById(R.id.listview_note);
       bt_add=(Button)findViewById(R.id.bt_add);
       bt_search=(Button)findViewById(R.id.bt_search);
       et_id=(EditText)findViewById(R.id.et_id);
       et_title=(EditText)findViewById(R.id.et_title);
       et_content=(EditText)findViewById(R.id.et_content);
    }

    /**
     * 清空值
     */
    private void clearEditTextValue(){
       et_id.setText("");
       et_title.setText("");
       et_content.setText("");
    }

    /**
     * 加载ListView
     */
    @SuppressWarnings("deprecation")
   private void loadListView(){
       SimpleCursorAdapter adapter = new SimpleCursorAdapter(MainActivity.this,R.layout.listview_item,getDataList(),
                new String[]{"_id","title","content"},
                new int[]{R.id.tv_id,R.id.tv_title,R.id.tv_content});
        listview_note.setAdapter(adapter);
    }

    /**
     * 读取外部系统Cursor数据
     * @return
     */
    private Cursor getDataList() {
       //从数据库读取listview数据
       ContentResolver contentResolver = getContentResolver();
        Uri uri = Uri.parse("content://com.zdsoft.notesProvider/notes");

        //用getTpye来获取返回结果是什么类型的东西
        String type=contentResolver.getType(uri);

        Toast.makeText(MainActivity.this, "返回类型为："+type, Toast.LENGTH_SHORT).show();

        Cursor cursor=contentResolver.query(uri, null, null, null, null);
        return cursor;
    }

    /**
     * 读取外部系统Cursor数据
     * @return
     */
    private Cursor getDataItem() {
       ContentResolver contentResolver = getContentResolver();
        Uri uri = Uri.parse(URISTRING_NOTES);
        if(et_id.getText().toString()==null||"".equals(et_id.getText().toString())){
           Toast.makeText(MainActivity.this, "请输入id查询", Toast.LENGTH_SHORT).show();
           return null;
        }else{
        Uri selectUri=Uri.withAppendedPath(uri, et_id.getText().toString());

           //Uri selectUri=Uri.withAppendedPath(baseUri, pathSegment)
           //用getTpye来获取返回结果是什么类型的东西
            String type=contentResolver.getType(selectUri);

            Toast.makeText(MainActivity.this, "返回类型为："+type, Toast.LENGTH_SHORT).show();
           System.out.println(selectUri);
            Cursor cursor=contentResolver.query(selectUri, null, null, null, null);
            return cursor;
        }
    }

}

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