java - 安卓中的R文件

Question

为什么R文件在android studio中没有生成？ xml文件没有任何错误。当我构建项目时，它给出如下错误消息。

Error:(2) Error retrieving parent for item: No resource found that matches the given name 'android:TextAppearance.Material.Widget.Button.Inverse'. Error:(2) Error retrieving parent for item: No resource found that matches the given name 'android:Widget.Material.Button.Colored'.

Error:Execution failed for task ':app:processDebugResources'. com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'C:\Users\admin_2\AppData\Local\Android\Sdk\build-tools\22.0.1\aapt.exe'' finished with non-zero exit value 1

代码

public class MainActivity extends Activity {
int counter;
Button add,sub;
TextView display;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    counter = 0;
    add = (Button)findViewById(R.id.bAdd);
    sub = (Button)findViewById(R.id.bSub);
    display = (TextView)findViewById(R.id.TvDisplay);

    add.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            counter++;
            display.setText("Your total is" + counter);

        }

    });

    sub.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            counter--;
            display.setText("Your total is" + counter);

        }

    });

}

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

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    int id = item.getItemId();

    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}
}

查看布局

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

    <TextView
        android:layout_height="wrap_content"
        android:layout_width="396dp"
        android:text="your total is 0"
        android:textSize="80px"
        android:layout_gravity="center_horizontal"
        android:gravity="center"
        android:id="@+id/TvDisplay"/>


    <Button android:layout_width="300dp"
        android:layout_height="wrap_content"
        android:text="add_one"
        android:textSize="20dp"
        android:layout_gravity="center_vertical"
        android:gravity="center"
        android:id="@+id/bAdd"
        />

    <Button android:layout_width="300dp"
        android:layout_height="wrap_content"
        android:text="subtract_one"
        android:textSize="20dp"
        android:gravity="center"
        android:id="@+id/bSub"
        />


</LinearLayout>

list 文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.admin_2.myapplication" >

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Answer 1

正如听起来的那样，如果 xml 中有错误，则不会生成 R.java。

出现错误的原因是您引用该样式的语法错误。

应该是:

@android:style/<name>