按下按钮并更改textview颜色

Question

任何人都可以看到我的代码有什么问题:(我甚至无法创建一个简单的应用程序,它不断崩溃它.

该应用程序将要做的是当用户按下按钮时,textview将颜色更改为RED.

public class MainActivity extends Activity {

public TextView tv1;
public Button bt1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    bt1 = (Button)findViewById(R.id.button1);
    tv1 = (Button)findViewById(R.id.textView1);

    bt1.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            tv1.setTextColor(Color.BLACK);
        }
    });

}

<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"
tools:context=".MainActivity" >

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:text="Button" />

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@+id/button1"
    android:layout_toRightOf="@+id/button1"
    android:text="TextView" />

Answer 1

tv1 = (Button)findViewById(R.id.textView1);

用...来代替

tv1 = (TextView)findViewById(R.id.textView1);