80c5e9777e8c001d14f6b3fae2cebb1c

基于ANdroid平台的高欢堂书籍的对应源代码 非常有用

package com.misoo.gx05;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.TextView;

public class ac01  extends Activity implements OnClickListener {
   	private final int WC = ViewGroup.LayoutParams.WRAP_CONTENT; 
	private Button  btn_1, btn_2;
	private RelativeLayout r_layout;
	private TextView tv;
	
	@Override
	public void onCreate(Bundle savedInstanceState) {
	   super.onCreate(savedInstanceState);
	   // ----- for testing --------------------- 
	   /*   setContentView(R.layout.main);
	        int digit_1 = 1;
	        int digit_2 = 1;
	        int cs = NativeJniAdder.calculate(digit_1, digit_2);
	        int sum = cs % 10;  	int carry = cs / 10;
			String carry_sum_str = String.valueOf(carry) + String.valueOf(sum);
			setTitle("[" + carry_sum_str +"]");
        */
         
        this.create_layout();
        setContentView(r_layout);
        setTitle("Native-Demo");
 	}
	public void show(String tx){
		tv.setText(tx);
	}
     private void create_layout(){
        r_layout = new RelativeLayout(this);
        RelativeLayout.LayoutParams param;
        tv = new TextView(this);
        tv.setText("press button:");
        tv.setId(1);
        
        param = new RelativeLayout.LayoutParams(180, WC);
        param.addRule(RelativeLayout.ALIGN_PARENT_TOP);
        param.topMargin = 10;
        param.leftMargin = 10;
        r_layout.addView(tv, param);
        
        btn_1 = new Button(this);
        btn_1.setId(2);
        btn_1.setText("Calculator");
        btn_1.setOnClickListener(this);
        param = new RelativeLayout.LayoutParams(WC, WC);
        param.addRule(RelativeLayout.BELOW, 1);
        param.addRule(RelativeLayout.ALIGN_LEFT, 1); 
        param.topMargin = 25;
        r_layout.addView(btn_1, param);
        
        btn_2 = new Button(this);
        btn_2.setId(3);
        btn_2.setText("Exit");
        btn_2.setOnClickListener(this);
        param = new RelativeLayout.LayoutParams(WC, WC);
        param.addRule(RelativeLayout.RIGHT_OF, 2);
        param.addRule(RelativeLayout.ALIGN_TOP, 2); 
        param.leftMargin = 5;
        r_layout.addView(btn_2, param);
  
     } 
	public void onClick(View arg0) {
		// TODO Auto-generated method stub
		if(arg0 == btn_1) {
		   Intent cal_intent = new Intent(ac01.this, CalActivity.class);
		   startActivity(cal_intent);
		}
		else
			finish();
		
	}
}