Question

我已经创建了这些按钮，但是在（//按钮）的每一行中出现“错误：id无法解析或不是字段”的错误，并且“错误：layour无法解析或不是字段” （r.layou.main）hwever看不到我的布局keypad.xml

的任何错误

keypad.Java

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);


        //Buttons
        one= (Button) findViewById(R.id.keypad_1);
        two= (Button) findViewById(R.id.keypad_2);
        three= (Button) findViewById(R.id.keypad_3);
        four= (Button) findViewById(R.id.keypad_4);
        five = (Button) findViewById(R.id.keypad_5);
        six= (Button) findViewById(R.id.keypad_6);
        seven = (Button) findViewById(R.id.keypad_7);
        eight = (Button) findViewById(R.id.keypad_8);
        nine = (Button) findViewById(R.id.keypad_9);
        minus = (Button) findViewById(R.id.keypad_subtract);
        hash = (Button) findViewById(R.id.keypad_hash);

keypad.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

<TextView
        android:id="@+id/Title"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="15dp"
        android:textSize="45sp">
 </TextView>

<TableLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/keypad"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:stretchColumns="*" >

        //setting up keypad buttons one, two and three in one row
<TableRow>
<Button android:id="@+id/keypad_1"
android:text="@string/keypad_1" >
</Button>
<Button android:id="@+id/keypad_2"
android:text="@string/keypad_2" >
</Button>
<Button android:id="@+id/keypad_3"
android:text="@string/keypad_3" >
</Button>
</TableRow>
        //setting up keypad buttons 4,5 and 6 in second row
<TableRow>
<Button android:id="@+id/keypad_4"
android:text="@string/keypad_4" >
</Button>
<Button android:id="@+id/keypad_5"
android:text="@string/keypad_5" >
</Button>
<Button android:id="@+id/keypad_6"
android:text="@string/keypad_6" >
</Button>
</TableRow>

        //setting up keypad buttons 7,8 and 9 in third row
<TableRow>
<Button android:id="@+id/keypad_7"
android:text="@string/keypad_7" >
</Button>
<Button android:id="@+id/keypad_8"
android:text="@string/keypad_8" >
</Button>
<Button android:id="@+id/keypad_9"
android:text="@string/keypad_9" >
</Button>
</TableRow>
        //setting up keypad buttons del,0,# and - in forth row
<TableRow>
    <Button android:id="@+id/delete"
android:text="@string/keypad_DEL" >
</Button>
<Button android:id="@+id/keypad_0"
android:text="@string/keypad_0" >
</Button>
<Button android:id="@+id/keypad_hash"
android:text="@string/keypad_#" >
</Button>
<Button android:id="@+id/keypad_subtract"
android:text="@string/keypad_-" >
</Button>
</TableRow>
</TableLayout>

    <TextView
        android:id="@+id/incorrect"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/incorrect" />
</LinearLayout>

Answer 1

似乎项目尚未编译。右键单击项目清理项目。如果xml中没有编译错误（红色标记），则clean应该解决问题。

Answer 2

是否可能发生此错误，因为您已命名字符串并且ID相同？

Answer 3

您正在为布局调用错误的.xml文件：

setContentView(R.layout.main);

应该是：

setContentView(R.layout.keypad);

另外，您是否在将它们绑定到ID之前创建了onCreate方法上方的按钮？

private Button one;
private Button two;
// and the rest of them...

错误：id无法解析或不是字段

3 个答案: