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我正在创建一个简单的事实应用程序并已完全按照教程进行操作，但在我的主 Activity 中收到错误无法解析符号 R。我尝试导入 mypackagename.R 但这也不起作用
我的包名是: 包 com.example.saarikakumar.myapplication;
我的主要 Activity 代码如下:
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.MotionEvent;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.example.saarikakumar.myapplication.android.R;
public class MainActivity extends AppCompatActivity {
TextView factBox;
LinearLayout bg;
Facts factHolder = new Facts();
Backgrounds backs = new Backgrounds();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
factBox = (TextView) findViewById(R.id.factTextbox);
bg = (LinearLayout) findViewById(R.id.background);
bg.setBackgroundColor(getResources().getColor(backs.getbackground()));
bg.setOnTouchListener(new OnSwipeTouchListener(this) {
public void onSwipeTop() {
}
public void onSwipeRight() {
prev();
}
public void onSwipeLeft() {
next();
}
public void onSwipeBottom() {
}
public boolean onTouch(View v, MotionEvent event) {
return gestureDetector.onTouchEvent(event);
}
});
}
private void prev() {
factBox.setText(factHolder.prevFact());
bg.setBackgroundColor(getResources().getColor(backs.getbackground()));
}
private void next() {
factBox.setText(factHolder.nextFact());
bg.setBackgroundColor(getResources().getColor(backs.getbackground()));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
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
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void genFact(View view) {
next();
}