如何让Activity继承方法

Question

我有十几个活动将继承针垫的相同方法。除了针垫之外，每个活动都完全不同。如何让我的活动从公共类继承方法？我做错了吗？

public class TestActivity extends PinPadActivity {
    TextView mEntry;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test);
        mEntry = (TextView) findViewById(R.id.entry_textview);
    }
}


public class PinPadActivity extends AppCompatActivity {
    String mPin;
    String mPinShow;
    TextView mEntry;
    public void on1Click(View v) {
        mPin = mPin+"1";
        mPinShow = mPinShow+"*";
        mEntry.setText(mPinShow);
    }
    public void on2Click(View v) {
        mPin = mPin+"2";
        mPinShow = mPinShow+"*";
        mEntry.setText(mPinShow);
    }
    public void on3Click(View v) {
        mPin = mPin+"3";
        mPinShow = mPinShow+"*";
        mEntry.setText(mPinShow);
    }
    public void on4Click(View v) {
        mPin = mPin+"4";
        mPinShow = mPinShow+"*";
        mEntry.setText(mPinShow);
    }
    public void on5Click(View v) {
        mPin = mPin+"5";
        mPinShow = mPinShow+"*";
        mEntry.setText(mPinShow);
    }
    public void on6Click(View v) {
        mPin = mPin+"6";
        mPinShow = mPinShow+"*";
        mEntry.setText(mPinShow);
    }
    public void on7Click(View v) {
        mPin = mPin+"7";
        mPinShow = mPinShow+"*";
        mEntry.setText(mPinShow);
    }
    public void on8Click(View v) {
        mPin = mPin+"8";
        mPinShow = mPinShow+"*";
        mEntry.setText(mPinShow);
    }
    public void on9Click(View v) {
        mPin = mPin+"9";
        mPinShow = mPinShow+"*";
        mEntry.setText(mPinShow);
    }
    public void on0Click(View v) {
        mPin = mPin+"0";
        mPinShow = mPinShow+"*";
        mEntry.setText(mPinShow);
    }
    public void onClearClick(View v) {
        mPin = "";
        mPinShow = "";
        mEntry.setText("");
    }
}

Answer 1

无论编码方式或是否为最佳方法，为了使您的代码有效，您应该删除TestActivity中的 TextView mEntry 并设置 public 或PinPadActivity中 TextView mEntry 的 protected 修饰符（子类无法访问默认或私有变量）。这应该允许您调用onXClick（）方法来设置继承自TestActivity中PinPadActivity的mEntry textview。

Answer 2

这可以成功，但不是正确的方法。将PinPad变成片段。然后在每个使用它的Activity中包含Fragment。