如何解决如何获得用户输入,例如editText,然后插入数据库sqlite?
单击保存按钮插入sqlite数据库时,我想获得诸如editText之类的用户输入。如何做到这一点。我正在搜索,但找不到。我正在编写一个记事本应用程序。参考image
package com.suleymanemre.notepad;
import androidx.appcompat.app.AppCompatActivity;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class note extends AppCompatActivity {
EditText editText;
Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_note);
button= findViewById(R.id.save);
editText = findViewById(R.id.editText);
}
public void save(View view){
SQLiteDatabase noteDatabase = openOrCreateDatabase("Notes",MODE_PRIVATE,null);
noteDatabase.execSQL("CREATE TABLE IF NOT EXISTS Notes(Notes VARCHAR);");
}
public void esc (View view){
super.onBackPressed();
}
}
解决方法
您需要准备一个扩展SQLiteOpenHelper的类。
此链接对于创建备忘录应用程序可能会有所帮助。
https://www.javahelps.com/2015/07/android-memo-application.html?m=1
,如果您只想保存1个值,请考虑使用SharedPreference,方法是:
SharedPreference mPref = context.getSharedPreferences(SETTINGS_NAME,Context.MODE_PRIVATE);
//get value
return mPref.getString(Key.YOUR_KEY,DEFAULT_VALUE_IN_STRING);
//add value
SharedPreferences.Editor mEditor = mPref.edit();
mEditor.putString(Key.YOUR_KEY,YOUR_VALUE);
mEditor.commit()
如果要使用SQLite数据库,请考虑使用Room:
将此添加到您的build.gradle文件:
def room_version = "2.2.5"
implementation "androidx.room:room-runtime:$room_version"
annotationProcessor "androidx.room:room-compiler:$room_version"
创建数据库类:
@androidx.room.Dao
public interface MyDao {
@Query("SELECT * FROM MyClass")
List<MyClass> getAll();
@Insert
void insertAll(List<MyClass> mList);
@Insert
void insert(MyClass mItem);
}
创建您的App数据库类:
@Database(entities = {MyClass.class},version = 1)
public abstract class MyAppDatabase extends RoomDatabase {
public abstract MyDao MyDao();
}
创建您的Singleton类:
public class MyDatabaseClient {
private Context mCtx;
private static MyDatabaseClient mInstance;
private MyAppDatabase myAppDatabase;
private MyDatabaseClient(Context mCtx) {
this.mCtx = mCtx;
myAppDatabase = Room.databaseBuilder(mCtx,MyClass.class,"MyDatabaseName").build();
}
public static synchronized MyDatabaseClient getInstance(Context mCtx) {
if (mInstance == null) {
mInstance = new MyDatabaseClient(mCtx);
}
return mInstance;
}
public MyAppDatabase getMyAppDatabase() {
return myAppDatabase;
您的商品类(随意添加新商品以保存或检索:
@Entity
public class MyClass implements Serializable {
@PrimaryKey(autoGenerate = true)
@ColumnInfo(name = "uid")
public int uid;
@ColumnInfo(name = "name")
public String name;
public int getUid() {
return uid;
}
public void setUid(int uid) {
this.uid = uid;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
用法:
//Get All
MyDatabaseClient.getInstance(getApplicationContext()).getMyAppDatabase().MyDao().getAll();
//Insert
final List<MyClass> mList = new ArrayList<>();
MyClass items = new MyClass();
items.setName("YOUR_VALUE");
mList.add(items);
MyDatabaseClient.getInstance(getApplicationContext()).getMyAppDatabase().MyDao().insertAll(mList);
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