Android 按下按钮后出错
为获取按钮上的单击事件而编写的代码Android 按下按钮后出错,android,Android,为获取按钮上的单击事件而编写的代码 public class MainActivity extends ActionBarActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (savedInstanceState =
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
}
Button button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v)
{
Toast.makeText(getApplicationContext(), "Button pressed.",Toast.LENGTH_LONG).show();
}
});
}
<Button
android:id="@+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textView1"
android:text="Button" />
Button button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v)
{
Toast.makeText(getApplicationContext(), "Button pressed.",Toast.LENGTH_LONG).show();
}
});
在这里发布你的logcat错误。你确定id按钮1存在于XML布局中吗？你能展示你完整的onCreate方法吗？确保我有按钮1。。。嗯，我拖进去了，现在还没有修改代码……必须有一个xml文件和一个用于fragment im MainActivity的方法。如果是，请将该方法分享给我。对不起。。同样的错误…把你的logcat错误贴在这里