我想这样做,只需点击一下按钮,就会弹出一条消息。带按钮的Android Eclipse弹出消息
现在弹出来,只要我打开应用程序。
BTW的按钮,我想触发弹出是main.xml中
关于按钮下面是我的main.xml(与布局的东西):
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/main"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#3DE400"
android:orientation="vertical" >
<!-- background originally #d78a00 -->
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="60dp"
android:fontFamily="sans-serif-condensed"
android:paddingLeft="10dp"
android:text="Sample App"
android:textColor="#FFF"
android:textSize="60sp" />
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="sans-serif-condensed"
android:paddingLeft="10dp"
android:text="@string/creator"
android:textColor="#FFF"
android:textSize="20dp" />
<Button
android:id="@+id/about"
android:layout_width="123dp"
android:layout_height="wrap_content"
android:layout_marginTop="50dp"
android:background="@android:color/transparent"
android:fontFamily="sans-serif-condensed"
android:gravity="left"
android:paddingLeft="10dp"
android:text="@string/about"
android:textColor="#FFF"
android:textSize="40dp"
android:onClick="show" />
</LinearLayout>
这里是我的MainActivity。 Java的:
package com.pranavsanghvi.sampleappv4;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.view.Menu;
import android.widget.Toast;
import android.content.DialogInterface;
import android.view.View;
import android.widget.Button;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
AlertDialog.Builder alert = new AlertDialog.Builder(MainActivity.this);
alert.setTitle("About");
alert.setMessage("Sample About");
alert.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick (DialogInterface dialog, int id) {
Toast.makeText (MainActivity.this, "Success", Toast.LENGTH_SHORT) .show();
}
});
alert.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Toast.makeText(MainActivity.this, "Fail", Toast.LENGTH_SHORT) .show();
}
});
alert.show();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
当我这样做,我有两个无法解决的警报和addNewContact ..我怎么能解决这个问题? – user3212831
在'aboutbutton'' setOnClickListener'内只使用'alert.show()' –
请参阅我的更新@ user3212831 –