Question

我正在Android中编写一个布局，它很有活力。由于我也在使用数据库，所以我决定将它分成不同的类，这意味着我有几个“设置”类。但是，这使我在调用它们时几乎将所有布局元素传递给类。我想知道的是，如果有一种方法可以将它们包装在一个类似Bundle的参数中，那么代码就不会太乱了。编码的一个例子：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_materialtab);
    final Spinner spnMaterial = (Spinner) findViewById(R.id.mat_spn_material);
    final EditText nome = (EditText) findViewById(R.id.mat_frm_nome);
    final EditText modE = (EditText) findViewById(R.id.mat_frm_elasticidade);
    final EditText dVol = (EditText) findViewById(R.id.mat_frm_densidade);
    final ImageButton atMaterial = (ImageButton) findViewById(R.id.mat_btm_atualizar);
    final ImageButton addMaterial = (ImageButton) findViewById(R.id.mat_btm_add);
    final ImageButton excMaterial = (ImageButton) findViewById(R.id.mat_btm_exc);
    createSpinner(nome, modE, dVol, spnMaterial, atMaterial, excMaterial, 0);
    createAddMaterial(nome, modE, dVol, spnMaterial, addMaterial, atMaterial, excMaterial);
    createAtMaterial(nome, modE, dVol, spnMaterial, atMaterial, excMaterial);
    createExcMaterial(nome, modE, dVol, spnMaterial, atMaterial, excMaterial);

}

public void createSpinner(final EditText nome, final EditText modE, final EditText dVol, final Spinner spnMaterial, final ImageButton atMaterial, final ImageButton excMaterial, final int position) {

    final SQLiteDatabase Estrutura = openOrCreateDatabase("Estrutura.db", getBaseContext().MODE_PRIVATE, null);
    final Cursor linha = Estrutura.rawQuery("SELECT * FROM MATERIAIS", null);
    String[] from = {"_id","nome","modE","dVol"};
    int[] to = {R.id.mat_lay_txvid,R.id.mat_lay_txvnome,R.id.mat_lay_txvmodE,R.id.mat_lay_txvdVol};
    SimpleCursorAdapter adp = new SimpleCursorAdapter(getBaseContext(), R.layout.sp_material, linha, from, to, 0);
    spnMaterial.setAdapter(adp);
    spnMaterial.setSelection(position);
    spnMaterial.setOnItemSelectedListener(new OnItemSelectedListener() {

        @Override
        public void onItemSelected(AdapterView<?> parent, View view,
                int position, long id) {
            linha.moveToPosition(position);
            nome.setText(linha.getString(1));
            modE.setText(String.valueOf(linha.getDouble(2)));
            dVol.setText(String.valueOf(linha.getDouble(3)));
            if(position == 0) {isEnabled(false, nome, modE, dVol, atMaterial, excMaterial);} else
                              {isEnabled(true, nome, modE, dVol, atMaterial, excMaterial);}
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {}
    });
}

public void createAddMaterial(final EditText nome, final EditText modE, final EditText dVol, final Spinner spnMaterial,final ImageButton addMaterial, final ImageButton atMaterial, final ImageButton excMaterial) {
    final SQLiteDatabase Estrutura = openOrCreateDatabase("Estrutura.db", getBaseContext().MODE_PRIVATE, null);

    addMaterial.setOnClickListener(new OnClickListener() {  
        @Override
        public void onClick(View v) {
            String sql = "INSERT INTO MATERIAIS(nome,modE,dVol) VALUES('Nome',0,0)";
            Estrutura.execSQL(sql);
            createSpinner(nome, modE, dVol, spnMaterial, atMaterial, excMaterial, spnMaterial.getAdapter().getCount());
        }
    });
}

public void createAtMaterial(final EditText nome, final EditText modE, final EditText dVol, final Spinner spnMaterial, final ImageButton atMaterial, final ImageButton excMaterial) {
    final SQLiteDatabase Estrutura = openOrCreateDatabase("Estrutura.db", getBaseContext().MODE_PRIVATE, null);

    atMaterial.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            StringBuilder sql = new StringBuilder();
            sql.append("UPDATE MATERIAIS SET ");
            sql.append("nome = '"+nome.getText().toString()+"', ");
            sql.append("modE = "+modE.getText().toString()+" , ");
            sql.append("dVol = "+dVol.getText().toString()+" ");
            sql.append("WHERE _id = "+spnMaterial.getSelectedItemId());
            Estrutura.execSQL(sql.toString());
            createSpinner(nome, modE, dVol, spnMaterial, atMaterial, excMaterial, spnMaterial.getSelectedItemPosition());
        }
    });
}

public void createExcMaterial(final EditText nome, final EditText modE, final EditText dVol, final Spinner spnMaterial, final ImageButton atMaterial, final ImageButton excMaterial) {
    final SQLiteDatabase Estrutura = openOrCreateDatabase("Estrutura.db", getBaseContext().MODE_PRIVATE, null);

    excMaterial.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            String sql = "DELETE FROM MATERIAIS WHERE _id = "+spnMaterial.getSelectedItemId();
            Estrutura.execSQL(sql);
            if(spnMaterial.getSelectedItemPosition() == spnMaterial.getAdapter().getCount()-1) {
                createSpinner(nome, modE, dVol, spnMaterial, atMaterial, excMaterial, spnMaterial.getSelectedItemPosition()-1);} else {
                createSpinner(nome, modE, dVol, spnMaterial, atMaterial, excMaterial, spnMaterial.getSelectedItemPosition());   }
        }
    });
}

public void isEnabled(boolean is, EditText nome, EditText modE, EditText dVol, ImageButton atMaterial, ImageButton excMaterial) {
    nome.setEnabled(is);
    modE.setEnabled(is);
    dVol.setEnabled(is);
    atMaterial.setEnabled(is);
    excMaterial.setEnabled(is);
}

}

正如你所看到的，这些课程收到了很多论点，我想让它看起来更好。由于它们有不同的类型，我不确定数组是否是最好的方法。

Answer 1

简答：不。你不能直接将视图放在一个包中，我不推荐它。您只能通过bundle传递Serializable或Parcelable对象。尝试序列化View然后稍后检索它将导致问题，如果视图的上下文自您放入束中以来已被破坏或损坏。由于垃圾收集器未经您的同意清理您的视图，您不希望发现随机崩溃。如果您尝试从两个不同的上下文编辑同一个View对象，则会遇到困难。

我有几个“设置”类

这些设置类只是普通的POJO，你可以获得对它的引用吗？然后像普通参数一样传递它。（因为它看起来像你的例子）

Manipulator manipulator = new ();
manipulator.createAddMaterial(customView1, customView2, material1, ...)

我想知道的是，是否有办法将它们包装在一个类似Bundle的参数中

如果您确实需要将视图传递给另一个Activity（实质上是另一个上下文），那么您最好的选择是从视图中提取相关数据并仅传递该视图。

MyViewData myViewData = new MyViewData();
myViewData.setText(view.getText());
myViewData.setMaterial(view.getMaterial());
Intent i = new Intent(this, NextActivity.class);
intent.putExtra(MY_VIEW_DATA, myViewData);
startActivity(intent);

然后您可以在其他活动中收到它，您将获得所需的相关数据。

我想知道的是，是否有办法将它们包装在一个类似Bundle的参数中，所以代码不会太乱。

如果你想保持干净，那么创建一个“霸主”对象，该对象将包含有关你的观点的所有相关数据。它的功能类似于Map，因此您可以检索有关特定视图的信息。在这种情况下，地图的“值”将是MyViewData个对象。这个霸主对象可以干净地捆绑到Intent中。

例如。

MyViewOverlord mvo = new MyViewOverlord();
mvo.saveDataForView("key1", myViewData1);
mvo.saveDataforView("key2" myViewData2);
intent.putExtra("ViewOverlord", mvo);

（您可以在此处查看类似问题的答案：How can i pass image view between activities in android）

将各种对象传递给Class

1 个答案: