android活动方法调用

问题描述：

我是android开发新手。今天我尝试了一些我创建了一个名为androidPickerviws的项目。android活动方法调用

在该项目中，我创建了两个活动，并在Timepicker.java活动中有一个方法，名为displayTime（hours，minute）;。现在我怀疑是否可以在Datepicker.java活动中使用此方法displayTime（）。如果是这样，我该怎么办呢..

这里IAM提供我Timepicker.java活动代码

package picker.view; 

// imports... 


public class Timepicker extends Activity{ 
public void onCreate(Bundle savedInstanceState){ 
    super.onCreate(savedInstanceState); 

    LinearLayout linearlayout=new LinearLayout(this); 
    linearlayout.setOrientation(LinearLayout.VERTICAL); 
    LinearLayout.LayoutParams layoutparams=new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT); 
    LayoutParams params=new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT); 

    final TimePicker timepicker=new TimePicker(this); 
    linearlayout.addView(timepicker, params); 

    Button ok=new Button(this); 
    ok.setText("OK"); 
    linearlayout.addView(ok, params); 
    addContentView(linearlayout,layoutparams); 

    ok.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View arg0) { 
      final int hours=timepicker.getCurrentHour(); 
      final int minute=timepicker.getCurrentMinute(); 
      displayTime(hours,minute); 
     } 

     private void displayTime(int hours, int minute) { 
      if(hours==0) 
       Toast.makeText(getBaseContext(), "Time saved is 12 : "+minute+" AM", Toast.LENGTH_SHORT).show(); 
      else if(hours<12) 
       Toast.makeText(getBaseContext(), "Time saved is "+hours+" : "+minute+" AM", Toast.LENGTH_SHORT).show(); 
      else if(hours==12) 
       Toast.makeText(getBaseContext(), "Time saved is "+hours+" : "+minute+" PM", Toast.LENGTH_SHORT).show(); 
      else 
       Toast.makeText(getBaseContext(), "Time saved is "+(hours-12)+" : "+minute+" PM", Toast.LENGTH_SHORT).show(); 

     } 
    }); 
} 
    }

答

我得到了我们可以这样调用的答案，但我们必须将该方法标记为public，并且应该将所有方法的输出端放在类的内部。修改后的代码如下

package picker.view; 

import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.view.ViewGroup.LayoutParams; 
import android.widget.LinearLayout; 
import android.widget.TimePicker; 
import android.widget.Button; 
import android.widget.Toast; 


public class Timepicker extends Activity{ 
public void onCreate(Bundle savedInstanceState){ 
    super.onCreate(savedInstanceState); 
/* setContentView(R.layout.timepicker); 

    final TimePicker timepicker=(TimePicker) findViewById(R.id.timePicker1);  

    Button ok=(Button) findViewById(R.id.button1);*/ 

    LinearLayout linearlayout=new LinearLayout(this); 
    linearlayout.setOrientation(LinearLayout.VERTICAL); 
    LinearLayout.LayoutParams layoutparams=new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT); 
    LayoutParams params=new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT); 

    final TimePicker timepicker=new TimePicker(this); 
    linearlayout.addView(timepicker, params); 

    Button ok=new Button(this); 
    ok.setText("OK"); 
    linearlayout.addView(ok, params); 
    addContentView(linearlayout,layoutparams); 

    ok.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View arg0) { 
      final int hours=timepicker.getCurrentHour(); 
      final int minute=timepicker.getCurrentMinute(); 
      displayTime(hours,minute); 
     } 
    }); 
} 
public void displayTime(int hours, int minute) { 
    if(hours==0) 
     Toast.makeText(getBaseContext(), "Time saved is 12 : "+minute+" AM", Toast.LENGTH_SHORT).show(); 
    else if(hours<12) 
     Toast.makeText(getBaseContext(), "Time saved is "+hours+" : "+minute+" AM", Toast.LENGTH_SHORT).show(); 
    else if(hours==12) 
     Toast.makeText(getBaseContext(), "Time saved is "+hours+" : "+minute+" PM", Toast.LENGTH_SHORT).show(); 
    else 
     Toast.makeText(getBaseContext(), "Time saved is "+(hours-12)+" : "+minute+" PM", Toast.LENGTH_SHORT).show(); 

}

}

答

你可以把你的代码的代码在一个静态方法的“utils的”类中：

Utils.displayTime(this, 12, 45);

：

public class Utils { 

private static void displayTime(Context context, int hours, int minute) { 
    if(hours==0) { 
     Toast.makeText(context, "Time saved is 12 : "+minute+" AM", Toast.LENGTH_SHORT).show(); 
    } 
    else if(hours<12) { 
     Toast.makeText(context, "Time saved is "+hours+" : "+minute+" AM", Toast.LENGTH_SHORT).show(); 
    } 
    else if(hours==12) { 
     Toast.makeText(context, "Time saved is "+hours+" : "+minute+" PM", Toast.LENGTH_SHORT).show(); 
    } 
    else { 
     Toast.makeText(context, "Time saved is "+(hours-12)+" : "+minute+" PM", Toast.LENGTH_SHORT).show(); 
    }  
} 
}

然后与调用它在你的活动

android活动方法调用

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