关于 Android 按钮事件 [英] About Android button event

问题描述

嗨我是 android 应用程序开发的新手.我正在练习 android 开发一段时间.这是我想要做的:

Hi I am new in android application development.I am practicing the android development for a while.Here is what i am trying to do:

在屏幕上有两个名为To"和From"的微调器和两个名为Amount"和Result"的编辑文本按钮.我想执行以下操作:

In the screen there is two spinner named "To" and "From" and two edit text button named "Amount" and "Result".i want to do the following:

当点击清除按钮时，它会将To"和From"重置为默认值并清除Amount"和Result".

when Clear button clicked it will reset the "To" and "From" to a default values and clear "Amount" and "Result".

任何人都知道吗?如果我得到代码会很有帮助.谢谢.

Can anybody have any idea?it will be very helpful if i get the code. Thanks.

推荐答案

这只是粗略的代码，我没有测试过，我只是写在我的头上，所以可能会有一些错误，我只是假设了一些布局 ID.你需要弄清楚这一点.

This is just the crude code, I haven't tested, I just wrote on top of my head, so there can be some errors and I just assumed some layout ids. You need to figure that out.

public class SpinnerExample extends Activity {
private String array_spinner[];
private Spinner toSpinner;
private Spinner fromSpinner;
private Button btnClear;
private EditText etAmount;
private EditText etResult;
@Override
public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.main);
     array_spinner=new String[3];
     array_spinner[0]="1";
     array_spinner[1]="2";
     array_spinner[2]="3";

fromSpinner = (Spinner)findViewById(R.id.fSpinner);
toSpinner = (Spinner)findViewById(R.id.tSpinner);
ArrayAdapter fromadapter = new ArrayAdapter(this,
android.R.layout.fspinneritem, array_spinner);
ArrayAdapter toadapter = new ArrayAdapter(this,android.R.layout.tspinner_item,array_spinner);

btnClear = (Button)findViewById(R.id.clear_button);


btnClear.setOnClickListener(new Button.OnClickListener(){
     public void onClick(View v){
       etAmount = (EditText)findViewById(R.id.amount_et);
       etResult = (EditText)findViewById(R.id.result_et);
       etAmount.setText("");
       etResult.setText("");
       fromSpinner.setAdapter(fromadapter);
       toSpinner.setAdapter(toadapter);
    }
});

}
}

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