在andriod工作室中顯示ListView上的數據

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我試圖從數據庫中檢索數據並將其顯示在listView上。數據將首先發送到數據庫並進行檢索和顯示。我沒有收到任何錯誤，但是我只是在嘗試運行模擬器時停止應用程序。我真的不知道是哪裏的問題在andriod工作室中顯示ListView上的數據

activity.main <

RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
     xmlns:tools="http://schemas.android.com/tools" 
     android:layout_width="368dp" 
     android:layout_height="495dp" 
     tools:context="com.instinctcoder.sqlitedb.MainActivity$PlaceholderFragment" 
     tools:layout_editor_absoluteY="8dp" 
     tools:layout_editor_absoluteX="8dp"> 

      <Button 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:text="Add" 
       android:id="@+id/btnAdd" 
       android:layout_alignParentBottom="true" 
       android:layout_alignParentLeft="true" 
       android:layout_alignParentStart="true" /> 

      <ListView 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:id="@+id/list" 
       android:layout_centerHorizontal="true" 
       android:layout_alignParentTop="true" 
       android:layout_above="@+id/btnAdd" /> 

      <Button 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:text="List All" 
       android:id="@+id/btnGetAll" 
       android:layout_alignParentBottom="true" 
       android:layout_toRightOf="@+id/btnAdd" /> 

     </RelativeLayout>

activity_treatment_details

  <TextView 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:textAppearance="?android:attr/textAppearanceMedium" 
       android:text="Treatment Name" 
       android:id="@+id/treatmentName" 
       android:layout_alignParentTop="true" 
       android:layout_alignParentLeft="true" 
       android:layout_alignParentStart="true" 
       android:layout_marginTop="30dp" /> 

      <TextView 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:textAppearance="?android:attr/textAppearanceMedium" 
       android:text="Treatment Type" 
       android:id="@+id/treatmentType" 
       android:layout_below="@+id/treatmentName" 
       android:layout_alignParentLeft="true" 
       android:layout_alignParentStart="true" 
       android:layout_marginTop="29dp" /> 

     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:textAppearance="?android:attr/textAppearanceMedium" 
      android:text="Treatment Number" 
      android:id="@+id/treatmentNumber" 
      android:layout_below="@+id/treatmentType" 
      android:layout_alignParentLeft="true" 
      android:layout_alignParentStart="true" 
      android:layout_marginTop="29dp" /> 

     <EditText 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:inputType="textPersonName" 
      android:ems="10" 
      android:id="@+id/editTextTreatmentName" 
      android:layout_above="@+id/treatmentType" 
      android:layout_toRightOf="@+id/treatmentName" 
      android:layout_alignParentRight="true" 
      android:layout_alignParentEnd="true" /> 

     <EditText 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:inputType="textEmailAddress" 
      android:ems="10" 
      android:id="@+id/editTextTreatmentType" 
      android:layout_above="@+id/treatmentNumber" 
      android:layout_toRightOf="@+id/treatmentName" 
      android:layout_alignRight="@+id/editTextTreatmentName" 
      android:layout_alignEnd="@+id/editTextTreatmentName" /> 

     <EditText 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:inputType="number" 
      android:ems="10" 
      android:id="@+id/editTextTreatmentNumber" 
      android:layout_alignBottom="@+id/treatmentNumber" 
      android:layout_alignLeft="@+id/editTextTreatmentType" 
      android:layout_alignStart="@+id/editTextTreatmentType" 
      android:layout_alignRight="@+id/editTextTreatmentType" 
      android:layout_alignEnd="@+id/editTextTreatmentType" /> 

     <Button 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="Save" 
      android:id="@+id/btnSave" 
      android:layout_alignParentBottom="true" 
      android:layout_toLeftOf="@+id/btnClose" /> 

     <Button 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="Close" 
      android:id="@+id/btnClose" 
      android:layout_alignParentBottom="true" 
      android:layout_alignParentRight="true" 
      android:layout_alignParentEnd="true" /> 

     <Button 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="Delete" 
      android:id="@+id/btnDelete" 
      android:layout_alignTop="@+id/btnSave" 
      android:layout_toLeftOf="@+id/btnSave" /> 

    </RelativeLayout>

view_treatment_entry

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
     android:orientation="vertical" android:layout_width="match_parent" 
     android:layout_height="match_parent"> 
     <TextView 
      android:id="@+id/treatment_Id" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:visibility="gone" /> 

     <TextView 
      android:id="@+id/treatment_name" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:paddingLeft="6dip" 
      android:paddingTop="6dip" 
      android:textSize="22sp" 
      android:textStyle="bold" /> 

    </LinearLayout>

Treatment.java

 public class Treatment { 


    // Labels table name 
    public static final String TABLE = "Treatment"; 

    // Labels Table Columns names 
    public static final String KEY_TreatmentID = "TreatmentId"; 
    public static final String KEY_TreatmentName = "TreatmentName"; 
    public static final String KEY_TreatmentType = "TreatmentType"; 
    public static final String KEY_TreatmentNumber = "TreatmentNumber"; 

    // property help us to keep data 
    public int treatment_ID; 
    public String treatmentName; 
    public String treatmentType; 
    public int treatmentNumber; 
}

DBHelper.java

`enter code here`public class DBHelper extends SQLiteOpenHelper { 


     //version number to upgrade database version 
     //each time if you Add, Edit table, you need to change the 
     //version number. 
     private static final int DATABASE_VERSION = 4; 

     // Database Name 
     private static final String DATABASE_NAME = "AbovePostnatalDepression.db"; 

     public DBHelper(Context context) { 
      super(context, DATABASE_NAME, null, DATABASE_VERSION); 
     } 

     @Override 
     public void onCreate(SQLiteDatabase db) { 
      //All necessary tables you like to create will create here 

      String CREATE_TABLE_TREATMENT = "CREATE TABLE " + Treatment.TABLE + "(" 
        + Treatment.KEY_TreatmentID + " INTEGER PRIMARY KEY AUTOINCREMENT ," 
        + Treatment.KEY_TreatmentName + " TEXT, " 
        + Treatment.KEY_TreatmentNumber + " INTEGER, " 
        + Treatment.KEY_TreatmentType + " TEXT)"; 

      db.execSQL(CREATE_TABLE_TREATMENT); 

     } 

     @Override 
     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
      // Drop older table if existed, all data will be gone!!! 
      db.execSQL("DROP TABLE IF EXISTS " + Treatment.TABLE); 

      // Create tables again 
      onCreate(db); 

     } 


}

TreatmentRepo

 public class TreatmentRepo { 

     private DBHelper dbHelper; 

     public TreatmentRepo(Context context) { 
      dbHelper = new DBHelper(context); 
     } 

     public int insert(Treatment treatment) { 

      //Open connection to write data 
      SQLiteDatabase db = dbHelper.getWritableDatabase(); 
      ContentValues values = new ContentValues(); 
      values.put(Treatment.KEY_TreatmentNumber, 
    treatment.treatmentNumber); 
      values.put(Treatment.KEY_TreatmentType,treatment.treatmentType); 
      values.put(Treatment.KEY_TreatmentName, treatment.treatmentName); 

      // Inserting Row 
      long treatment_ID = db.insert(Treatment.TABLE, null, values); 
      db.close(); // Closing database connection 
      return (int) treatment_ID; 
     } 

     public void delete(int treatment_ID) { 

      SQLiteDatabase db = dbHelper.getWritableDatabase(); 
      // It's a good practice to use parameter ?, instead of concatenate string 
      db.delete(Treatment.TABLE, Treatment.KEY_TreatmentID + "= ?", new String[] { String.valueOf(treatment_ID) }); 
      db.close(); // Closing database connection 
     } 

     public void update(Treatment treatment) { 

      SQLiteDatabase db = dbHelper.getWritableDatabase(); 
      ContentValues values = new ContentValues(); 

      values.put(Treatment.KEY_TreatmentNumber, treatment.treatmentNumber); 
      values.put(Treatment.KEY_TreatmentType,treatment.treatmentType); 
      values.put(Treatment.KEY_TreatmentName, treatment.treatmentName); 

      db.update(Treatment.TABLE, values, Treatment.KEY_TreatmentID + "= ?", new String[] { String.valueOf(treatment.treatment_ID) }); 
      db.close(); // Closing database connection 
     } 

     public ArrayList<HashMap<String, String>> getTreatmentList() { 
      //Open connection to read only 
      SQLiteDatabase db = dbHelper.getReadableDatabase(); 
      String selectQuery = "SELECT " + 
        Treatment.KEY_TreatmentID + "," + 
        Treatment.KEY_TreatmentName + "," + 
        Treatment.KEY_TreatmentType + "," + 
        Treatment.KEY_TreatmentNumber + 
        " FROM " + Treatment.TABLE; 


      ArrayList<HashMap<String, String>> treatmentList = new ArrayList<HashMap<String, String>>(); 

      Cursor cursor = db.rawQuery(selectQuery, null); 
      // looping through all rows and adding to list 

      if (cursor.moveToFirst()) { 
       do { 
        HashMap<String, String> treatment = new HashMap<String, 
    String>(); 
        treatment.put("TreatmentId", 
    cursor.getString(cursor.getColumnIndex(Treatment.KEY_TreatmentID))); 
        treatment.put("TreatmentName", 
    cursor.getString(cursor.getColumnIndex(Treatment.KEY_TreatmentName))); 
        treatmentList.add(treatment); 

       } while (cursor.moveToNext()); 
      } 

      cursor.close(); 
      db.close(); 
      return treatmentList; 

     } 

     public Treatment getTreatmentById(int Id){ 
      SQLiteDatabase db = dbHelper.getReadableDatabase(); 
      String selectQuery = "SELECT " + 
        Treatment.KEY_TreatmentID + "," + 
        Treatment.KEY_TreatmentName + "," + 
        Treatment.KEY_TreatmentType + "," + 
        Treatment.KEY_TreatmentNumber + 
        " FROM " + Treatment.TABLE 
        + " WHERE " + 
        Treatment.KEY_TreatmentID + "=?";// It's a good practice to 
    use parameter ?, instead of concatenate string 

      int iCount =0; 
      Treatment treatment = new Treatment(); 

      Cursor cursor = db.rawQuery(selectQuery, new String[] { 
    String.valueOf(Id) }); 

      if (cursor.moveToFirst()) { 
       do { 
        treatment.treatment_ID 
    =cursor.getInt(cursor.getColumnIndex(Treatment.KEY_TreatmentID)); 
        treatment.treatmentName 
    =cursor.getString(cursor.getColumnIndex(Treatment.KEY_TreatmentName)); 
        treatment.treatmentType 
    =cursor.getString(cursor.getColumnIndex(Treatment.KEY_TreatmentType)); 
        treatment.treatmentNumber 
    =cursor.getInt(cursor.getColumnIndex(Treatment.KEY_TreatmentNumber)); 

       } while (cursor.moveToNext()); 
      } 

      cursor.close(); 
      db.close(); 
      return treatment; 
     }

TreatmentDetail

public class TreatmentDetail extends AppCompatActivity implements 
    android.view.View.OnClickListener { 


     Button btnSave , btnDelete; 
     Button btnClose; 
     EditText editTextTreatmentName; 
     EditText editTextTreatmentType; 
     EditText editTextTreatmentNumber; 
     private int _Treatment_Id=0; 

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

      btnSave = (Button) findViewById(R.id.btnSave); 
      btnDelete = (Button) findViewById(R.id.btnDelete); 
      btnClose = (Button) findViewById(R.id.btnClose); 

      editTextTreatmentName = (EditText) 
    findViewById(R.id.editTextTreatmentName); 
      editTextTreatmentType = (EditText) 
    findViewById(R.id.editTextTreatmentType); 
      editTextTreatmentNumber = (EditText) 
    findViewById(R.id.editTextTreatmentNumber); 

      btnSave.setOnClickListener(this); 
      btnDelete.setOnClickListener(this); 
      btnClose.setOnClickListener(this); 


      _Treatment_Id =0; 
      Intent intent = getIntent(); 
      _Treatment_Id =intent.getIntExtra("treatment_Id", 0); 
      TreatmentRepo repo = new TreatmentRepo(this); 
      Treatment treatment = new Treatment(); 
      treatment = repo.getTreatmentById(_Treatment_Id); 


    editTextTreatmentNumber.setText(String.valueOf(treatment.treatmentNumber)); 
      editTextTreatmentName.setText(treatment.treatmentName); 
      editTextTreatmentType.setText(treatment.treatmentType); 
     } 



     public void onClick(View view) { 
      if (view == findViewById(R.id.btnSave)){ 
       TreatmentRepo repo = new TreatmentRepo(this); 
       Treatment treatment = new Treatment(); 
       treatment.treatmentNumber= 
    Integer.parseInt(editTextTreatmentNumber.getText().toString()); 

    treatment.treatmentType=editTextTreatmentType.getText().toString(); 

    treatment.treatmentName=editTextTreatmentName.getText().toString(); 
       treatment.treatment_ID=_Treatment_Id; 

       if (_Treatment_Id==0){ 
        _Treatment_Id = repo.insert(treatment); 

        Toast.makeText(this,"New Student 
    Insert",Toast.LENGTH_SHORT).show(); 
       }else{ 

        repo.update(treatment); 
        Toast.makeText(this,"Student Record 
    updated",Toast.LENGTH_SHORT).show(); 
       } 
      }else if (view== findViewById(R.id.btnDelete)){ 
       TreatmentRepo repo = new TreatmentRepo(this); 
       repo.delete(_Treatment_Id); 
       Toast.makeText(this, "Student Record Deleted", 
    Toast.LENGTH_SHORT); 
       finish(); 
      }else if (view== findViewById(R.id.btnClose)){ 
       finish(); 
      } 


     } 


    }

Mainactivity

public class MainActivity extends ListActivity implements 
android.view.View.OnClickListener { 


    Button btnAdd,btnGetAll; 
    TextView treatment_Id; 

    @Override 
    public void onClick(View view) { 
     if (view== findViewById(R.id.btnAdd)){ 

      Intent intent = new Intent(this,TreatmentDetail.class); 
      intent.putExtra("treatment_Id",0); 
      startActivity(intent); 

     }else { 

      TreatmentRepo repo = new TreatmentRepo(this); 

      ArrayList<HashMap<String, String>> treatmentList = 
    repo.getTreatmentList(); 
      if(treatmentList.size()!=0) { 
       ListView lv = getListView(); 
       lv.setOnItemClickListener(new 
AdapterView.OnItemClickListener() { 
        @Override 
        public void onItemClick(AdapterView<?> parent, View v 
view,int position, long id) { 
         treatment_Id = (TextView) 
view.findViewById(R.id.treatment_Id); 
         String treatmentId = 
treatment_Id.getText().toString(); 
         Intent objIndent = new 
Intent(getApplicationContext(),TreatmentDetail.class); 
         objIndent.putExtra("treatment_Id", Integer.parseInt( 
treatmentId)); 
         startActivity(objIndent); 
        } 
       }); 
       ListAdapter adapter = new SimpleAdapter( 
MainActivity.this,treatmentList, R.layout.activity_view_treatment_entry, new 
String[] { "TreatmentId","TreatmentName"}, new int[] {R.id.treatment_Id, 
R.id.treatment_name}); 
       setListAdapter(adapter); 
      }else{ 
       Toast.makeText(this,"No student!",Toast.LENGTH_SHORT).show(); 
      } 

     } 
    } 



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

    btnAdd = (Button) findViewById(R.id.btnAdd); 
    btnAdd.setOnClickListener(this); 

    btnGetAll = (Button) findViewById(R.id.btnGetAll); 
    btnGetAll.setOnClickListener(this); 
} 




}

來源

2017-08-31 Omade

ListActivity有它自己的佈局（包括ListView），所以如果你想通過調用setContentView()定製佈局，那麼你必須使用id爲"@android:id/list"爲ListView

Docs link

ListActivity has a default layout是由一個單一，屏幕中央的全屏列表。但是，如果您願意，您可以在onCreate（）中使用您自己的視圖佈局和setContentView()，以獲得 you can customize the screen layout的setting。要做到這一點，你自己的看法MUST contain a ListView object with the id "@android:id/list"

所以更換此

android:id="@+id/list"

與

android:id="@android:id/list"

，並使用view.getId() == R.id.btnAdd代替view== findViewById(R.id.btnAdd)它是一個昂貴的函數調用

或

另外，您可以extends AppCompatActivity或Activity和使用setOnItemClickListener

setOnItemClickListener on custom ListView

來源

2017-08-31 16:40:37

也讀https：//開頭計算器。com/questions/14713539/android-listactivity-row-click'在'ListActivity'中實現點擊'' –

感謝您的評論。我嘗試了這個建議，但是當我點擊btnAdd關閉應用 – Omade

現在你有其他問題，如果你仍然在使用listActivity，那麼重寫'onListItemClick（）'不要使用你自己的監聽器，並且總是發佈錯誤細節從logcat獲得幫助，從任何人在stackoverflow –

在andriod工作室中顯示ListView上的數據

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