[英]Three buttons, each start the same Activity with a different Int. But when selecting any button, it loads all 3 Activities
[英]Multiple buttons w/ each selecting a different Activity
我是编码新手,当我的主“活动”页面上有一系列按钮时,我正在尝试处理一个项目。 我希望从这些按钮中打开一个不同的活动或命令。 我一直在搜索,发现我认为应该工作的内容,但是没有。 加载应用程序然后单击按钮时,我崩溃了。 下面是代码。 任何表示我的错误的地方的指针,将不胜感激。
package com.example.finalproject2;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Initialize Buttons
Button b1 = (Button) findViewById(R.id.button1);
Button b2 = (Button) findViewById(R.id.button02);
Button b3 = (Button) findViewById(R.id.button03);
Button b4 = (Button) findViewById(R.id.button01);
Button b5 = (Button) findViewById(R.id.button04);
//Set OnCLickListeners
b1.setOnClickListener(chicagoListener);
b2.setOnClickListener(sanJoseListener);
b3.setOnClickListener(baltimoreListener);
b4.setOnClickListener(westPalmBeachListener);
b5.setOnClickListener(websiteListener); }
private OnClickListener chicagoListener = new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
startActivity(new Intent(MainActivity.this, Chicago.class));
}
};
private OnClickListener sanJoseListener = new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
startActivity(new Intent(MainActivity.this, SanJose.class));
}
};
private OnClickListener baltimoreListener = new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
startActivity(new Intent(MainActivity.this, Baltimore.class));
}
};
private OnClickListener westPalmBeachListener = new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
startActivity(new Intent(MainActivity.this, WestPalmBeach.class));
}
};
private OnClickListener websiteListener = new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse ("http://www.google.com/")));
}
};
{
}
}
在应用清单文件中提及您的所有活动(如下所示):
<activity
android:name="com.example.finalproject2.Chicago"
android:label="@string/app_name" >
</activity>
并尝试执行以下操作:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b1.setOnClickListener(this);
b2.setOnClickListener(this);
b3.setOnClickListener(this);
b4.setOnClickListener(this);
b5.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch(v.getId()){
case R.id.button1:
startActivity(new Intent(MainActivity.this, Chicago.class));
break;
case R.id.button02:
startActivity(new Intent(MainActivity.this, SanJose.class));
break;
case R.id.button03:
startActivity(new Intent(MainActivity.this, Baltimore.class));
break;
case R.id.button01:
startActivity(new Intent(MainActivity.this, WestPalmBeach.class));
break;
case R.id.button04:
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse ("http://www.google.com/")));
break;
}
}
来自开发人员站点的样本
Button button = (Button) findViewById(R.id.button_send);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Do something in response to button click
}
});
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.