android-從編輯文本中檢索int值

從編輯文本中檢索int值

有兩個文本框和一個數組，想要將數組索引號寫在文字框1，然後在點擊Calculate按鈕時，在文本框2中獲取數組值。

"MainActivity.java"代碼如下：

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button B1 = (Button) findViewById(R.id.button1);
B1.setOnClickListener(new View.OnClickListener() {

final EditText ET2 = (EditText) findViewById(R.id.editText2);

public void onClick(View v) {

final int[] oil={20,30,40,50,60,70,80,90,100};
final String str = String.valueOf(R.id.editText1);
final int y = Integer.parseInt(str);
final int z = oil[y];

ET2.setText(z);
}
});
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}

"activity_main.xml"代碼：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >

<EditText
    android:id="@+id/editText1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="67dp"
    android:ems="10" 
    android:inputType="number" />

<EditText
    android:id="@+id/editText2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/editText1"
    android:layout_below="@+id/editText1"
    android:ems="10"
    android:inputType="number" >

    <requestFocus />
</EditText>

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"
    android:text="Calculate" />

最佳回答：

大概就是這樣，你寫的錯誤太多了

 private Button b1;
    private EditText e1,e2;
    private final int[] oil={20,30,40,50,60,70,80,90,100};
    public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    b1 = (Button) findViewById(R.id.button1);
    e1 = (EditText) findViewById(R.id.editText1);
    e2 = (EditText) findViewById(R.id.editText2);
    b1 .setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
    String string = e1.getText().toString();
    int index = Integer.valueOf(string);
    int z = oil[index ];
    e2.setText(z);//這裡不能直接這樣寫 會報錯 傳遞int值代表的是id
    應該寫成e2.setText(""+z);或者e2.setText(String.valueOf(z));
    }
    });
    }