我在Eclipse中为Android编写了以下代码:
package mohammad.negahdari.mystartup4;
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MyStartup4Activity extends Activity {
public int counter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final TextView txtCaption = (TextView) findViewById(R.id.txtCaption);
final Button btn1 = (Button) findViewById(R.id.txtCaption);
txtCaption.setText("Hooora");
txtCaption.setTextColor(Color.parseColor("#0000ff"));
txtCaption.setBackgroundColor(Color.parseColor("#ffffff"));
for (int i = 0; i <= 4; i++)
Toast.makeText(MyStartup4Activity.this, "Mohammad " + i, Toast.LENGTH_SHORT).show();
txtCaption.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Log.i("LOG", "Clicked");
Toast.makeText(MyStartup4Activity.this, "Clicked", Toast.LENGTH_SHORT).show();
counter++;
txtCaption.setText("Number is : " + counter);
}
});
btn1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Log.i("LOG", "Clicked");
Toast.makeText(MyStartup4Activity.this, "Clicked", Toast.LENGTH_SHORT).show();
txtCaption.setVisibility(View.GONE);
}
});
}
}
并收到此错误:
该应用程序意外停止。请再试一遍
但是当我删除这些行时:
btn1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Log.i("LOG", "Clicked");
Toast.makeText(MyStartup4Activity.this, "Clicked", Toast.LENGTH_SHORT).show();
txtCaption.setVisibility(View.GONE);
}
});
我没有错。
我的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/txtCaption"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#ff00ff"
android:gravity="center"
android:text="..."
android:textColor="#00ff00"
android:textSize="40dip" />
<Button
android:id="@+id/btn1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
</LinearLayout>
最佳答案
该应用程序意外停止。请再试一次但是当我
删除这些行:没有错误。
显然,您指的是错误的ID
final TextView txtCaption = (TextView) findViewById(R.id.txtCaption);
final Button btn1 = (Button) findViewById(R.id.txtCaption);
检查xml中的
button
ID。您应该为您的button
指定其他ID。在您的情况下,您应该使用
final Button btn1 = (Button) findViewById(R.id.btn1);