Android Activity无效

Question

我有这项活动，

package org.dewsworld.ui;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class Main extends Activity {

    TextView textView ;

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

        textView = (TextView) findViewById(R.id.textView1) ;
        textView.setText("hello ") ;
    }

}

main.xml是

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent" android:id="@+id/textView1">
    <TextView android:layout_height="wrap_content" android:id="@+id/textView1"
        android:layout_width="wrap_content" android:text="TextView" />
</LinearLayout>

logcat是

我找不到错误...... :(

Answer 1

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
    <TextView android:layout_height="wrap_content" android:id="@+id/textView1"
        android:layout_width="wrap_content" android:text="TextView" />
</LinearLayout>

立即尝试

Answer 2

你有2个视图使用相同的ID Linearlayout和TextView。删除LinearLayout的id并再次尝试。它会起作用。