[Android]初學 使用Intent在Activity傳值(二)

Bundle的傳值，只是單純的A-->B , B-->C 單向傳值 

不像上一篇講到的AB互傳溝通

因此Bundle傳值時，給出的畫面是一個新的、乾淨的初始畫面

範例:

	public class MainActivity extends AppCompatActivity {
	private Button widget2;
	protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_main);
	widget2 =(Button)findViewById(R.id.btnNext2);
	//接收SecondActivity bundle傳來的參數
	Bundle param = getIntent().getExtras();
	if(param !=null)
	{
	setTitle(param.getString("bparam"));
	}
	//利用bundle傳參數到ScondActivity
	widget2.setOnClickListener(new Button.OnClickListener() {
	public void onClick(View v) {
	Intent intent2 = new Intent();
	Bundle bundle= new Bundle();
	bundle.putString("sourse","bundle from Main");
	intent2.setClass(MainActivity.this, widgetActivity2.class);
	intent2.putExtras(bundle);
	startActivity(intent2);
	}
	});
	}
	}

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	public class SecondActivity extends AppCompatActivity {
	private Button prev;
	@Override
	public void onCreate(Bundle savedInstanceState){
	super.onCreate(savedInstanceState);
	setContentView(R.layout.widget2);
	//接收Main 傳來的參數
	Bundle bundle = getIntent().getExtras();
	if(bundle !=null)
	{
	setTitle(bundle.getString("sourse"));
	}
	prev =(Button)findViewById(R.id.button1);
	//Bundle傳送參數到Main
	prev.setOnClickListener(new Button.OnClickListener() {
	public void onClick(View v) {
	Intent intent = new Intent();
	intent.setClass(widgetActivity2.this, MainActivity.class);
	// Bundle 傳送參數
	Bundle param = new Bundle();
	param.putString("bparam", "from widget2");
	intent.putExtras(param);
	startActivity(intent);
	}
	});

view raw Second.java hosted with ❤ by GitHub