多个按钮w /每个选择一个不同的活动

Question

我是新来的编码，并试图在我的主要活动页面有一系列按钮时在项目上工作。从这些按钮我希望每个人打开不同的活动或命令。我一直在寻找，发现我认为应该工作，但是，它没有。当它加载应用程序，然后点击按钮时，我会崩溃。以下是代码。任何指示我的错误在某处会受到赞赏。

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/"))); 
    } 
}; 




     { 
} 





} 

Answer 1

提起你的所有活动在您的应用程序宣言文件（像这样）：

<activity 
     android:name="com.example.finalproject2.Chicago" 
     android:label="@string/app_name" > 
</activity> 

并尝试做财产以后这样的：

@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; 

    } 
} 

Answer 2

Button - Android developer

从开发者网站样本

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 
     } 
    }); 

another good example of how to use onclick