エラーと書いた部分二つとも、thisを入れるとエラーが起きます。どう直せばいいのか教えてください。getApplicationContext()やgetBaseContext()だとエラーにはならないものの実行した時に強制終了します。
public class MainActivity extends ActionBarActivity {
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } @Override protected void onStart() { super.onStart(); Button main_btn = (Button)findViewById(R.id.main_button); main_btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Intent main_intent = new Intent(MainActivity.this, SecondActivity.class); startActivity(main_intent); } }); Button main_get_btn = (Button)findViewById(R.id.main_get_button); main_get_btn.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v){ EditText edit1 = (EditText)findViewById(R.id.main_editText); String memo = edit1.getText().toString(); try { String res = loadData(memo); //ここがエラー AlertDialog.Builder dlog = new AlertDialog.Builder(this); dlog.setTitle(memo); dlog.setMessage(res); dlog.create().show(); } catch (IOException e) { e.printStackTrace(); } } }); Button main_put_btn = (Button)findViewById(R.id.main_put_button); main_put_btn.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v){ EditText edit1 = (EditText) findViewById(R.id.main_editText); String memo = edit1.getText().toString(); try { if (saveData(memo) != -1) { //ここがエラー Toast toast = Toast.makeText(this, "put memo!", Toast.LENGTH_SHORT); toast.show(); } } catch (IOException e) { e.printStackTrace(); } } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.menu_main, menu); menu.add("Put Memo"); menu.add("Get Memo"); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { if ("Put Memo".equals(item.getTitle())) { EditText edit1 = (EditText) this.findViewById(R.id.main_editText); String memo = edit1.getText().toString(); try { if (saveData(memo) != -1) { Toast toast = Toast.makeText(this, "put memo!", Toast.LENGTH_SHORT); toast.show(); } } catch (IOException e) { e.printStackTrace(); } } if ("Get Memo".equals(item.getTitle())){ EditText edit1 = (EditText)findViewById(R.id.main_editText); String memo = edit1.getText().toString(); try { String res = loadData(memo); AlertDialog.Builder dlog = new AlertDialog.Builder(this); dlog.setTitle(memo); dlog.setMessage(res); dlog.create().show(); } catch (IOException e){ e.printStackTrace(); } } return super.onOptionsItemSelected(item); } private long saveData(String data) throws IOException { String time = Calendar.getInstance().getTime().toString(); MyDatabaseHelper helper = new MyDatabaseHelper(this); SQLiteDatabase db = helper.getWritableDatabase(); ContentValues values = new ContentValues(); values.put(MyDatabaseHelper.MEMO, data); values.put(MyDatabaseHelper.DATETIME, time); long result = -1; if (db != null) { result = db.insert(MyDatabaseHelper.TABLE_NAME, null, values); } return result; } private String loadData(String find) throws IOException { MyDatabaseHelper helper = new MyDatabaseHelper(this); SQLiteDatabase db = helper.getReadableDatabase(); String query = "select * from " + MyDatabaseHelper.TABLE_NAME + " where " + MyDatabaseHelper.MEMO + " like '%" + find + "%'"; String result = "見つかりませんでした。"; if (db != null) { Cursor c = db.rawQuery(query, null); if (c.moveToFirst()) { result = c.getString(1) + "/n" + c.getString(2); } } return result; }
}
class MyDatabaseHelper extends SQLiteOpenHelper {
static final String ID = "id"; static final String DATABASE_NAME = "mydatabase.db"; static final int DATABASE_VERSION = 1; static final String TABLE_NAME = "mydata"; static final String MEMO = "memo"; static final String DATETIME = "datetime"; MyDatabaseHelper(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); } public void onCreate(SQLiteDatabase db) { String query = "create table " + TABLE_NAME + "(" + ID + " INTEGER PRIMARY KEY," + MEMO + " TEXT," + DATETIME + " TEXT);"; db.execSQL(query); } public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { db.execSQL("drop table if exists " + TABLE_NAME); onCreate(db); }
}
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2015/05/19 01:12
2015/05/19 01:20
2015/05/19 01:43