Intent傳遞數據從一個Activity到另一個Activity

MainActivity

 

package com.test.intentdemo;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {

    private Button btn=null;

    public void onCreate(Bundle savedInstanceState)//onCreate方法用來初始化Activity實例對象
    {
        super.onCreate(savedInstanceState);//super.onCreate(savedInstanceState)的作用是調用其父類Activity的onCreate方法來實現對界面的圖畫繪制工作
        setContentView(R.layout.activity_main);//setContentView(R.layout.main)的作用是加載一個界面
        btn=(Button)findViewById(R.id.btn);
        btn.setOnClickListener(listener);
    }
    private View.OnClickListener listener=new View.OnClickListener()
    {

        @Override
        public void onClick(View v)
        {
//          Intent intent=new Intent();
//          intent.setAction(Intent.ACTION_SENDTO);
//          intent.setData(Uri.parse("smsto:5554"));
//          intent.putExtra("sms_body", "Hello!");//sms_body不能隨意換成
//          startActivity(intent);
            Intent intent=new Intent();
            intent.setClass(MainActivity.this, SecondActivity.class);//從一個activity跳轉到另一個activity
            intent.putExtra("str", "Intent Demo");//給intent添加額外數據，key為“str”,key值為"Intent Demo"
            startActivity(intent);
        }
    };
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}

 secondAcitivity

 

package com.test.intentdemo;

import android.R.string;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class SecondActivity extends Activity
{
    private TextView secondTxt;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second);
        Intent intent=getIntent();//getIntent將該項目中包含的原始intent檢索出來，將檢索出來的intent賦值給一個Intent類型的變量intent
        Bundle bundle=intent.getExtras();//.getExtras()得到intent所附帶的額外數據
        String str=bundle.getString("str");//getString()返回指定key的值
        secondTxt=(TextView)findViewById(R.id.secondTxt);//用TextView顯示值
        secondTxt.setText(str);

    }

}