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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                **使用意圖傳遞數據的幾種方式** **[點此獲取完整代碼](http://download.csdn.net/detail/u012904198/7312525)** 我們除了要從活動返回數據,也常常要傳遞數據給活動。對此我們可以使用Intent對象將這些數據傳遞給目標活動。 1、創建一個名為PassingData的項目,在activity_main.xml文件中添加一個Button: ~~~ <Button android:id="@+id/btn_SecondActivity" android:layout_width="fill_parent" android:layout_height="wrap_content" android:onClick="onClick" android:text="Click to go to Second Activity" /> ~~~ 2、在res/layout文件夾中添加一個新的secondactivity.xml文件,添加TextView和Button: ~~~ <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Welcome to Second Activity" /> <Button android:id="@+id/btn_MainActivity" android:layout_width="fill_parent" android:layout_height="wrap_content" android:onClick="onClick" android:text="Click to return to main activity" /> ~~~ 3、在當前包中新建一個Class,命名為SecondActivity,在SecondActivity.java中添加如下代碼: ~~~ package com.example.passingdata; import android.app.Activity; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.view.View; import android.widget.Toast; public class SecondActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.secondactivity); // 為了獲得通過Intent對象發送的數據,先使用getIntent()方法獲取Intent對象, // 再調用該對象的getStringExtra()方法來獲得使用putExtra()方法設置的字符串值 Toast.makeText(this, getIntent().getStringExtra("str1"), Toast.LENGTH_SHORT).show(); // 同上,對于整數值,調用getIntExtra()方法(注意,如果該名稱沒有存儲值,則會使用默認值,在此為0) Toast.makeText(this, Integer.toString(getIntent().getIntExtra("age1", 0)), Toast.LENGTH_SHORT).show(); // 獲取Bundle對象,要使用getExtras()方法:對于字符串值,使用getString();對于整數值,使用getInt() Bundle bundle = getIntent().getExtras(); Toast.makeText(this, bundle.getString("str2"), Toast.LENGTH_SHORT) .show(); Toast.makeText(this, Integer.toString(bundle.getInt("age2")), Toast.LENGTH_SHORT).show(); } public void onClick(View v) { Intent intent = new Intent(); intent.putExtra("age3", 45); // 回傳可以使用setData()方法(上一篇中講過) intent.setData(Uri.parse("Something passed back to main activity")); // 設置Intent和結果碼 setResult(RESULT_OK, intent); // 關閉活動 finish(); } } ~~~ 4、在AndroidManifest.xml文件中添加如下代碼: ~~~ <activity android:name=".SecondActivity" android:label="Second Activity" > <intent-filter> <action android:name="net.zenail.PassingData.SecondActivity" /> <category android:name="android.intent.category.DEFAULT" /> </intent-filter> </activity> ~~~ 5、在MainActivity.java文件中添加如下代碼: ~~~ public void onClick(View view) { Intent intent = new Intent("net.zenail.PassingData.SecondActivity"); // 法一:使用putExtra()方法為Intent對象添加了兩個鍵/值對:String和integer類型 intent.putExtra("str1", "This is a string"); intent.putExtra("age1", 25); // 法二:創建Bundle對象,向其添加兩個鍵/值對,再使用putExtras添加給Intent對象 Bundle extras = new Bundle(); extras.putString("str2", "This is another string"); extras.putInt("age2", 35); intent.putExtras(extras); // 啟動活動并設置1為請求碼 startActivityForResult(intent, 1); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { // TODO Auto-generated method stub super.onActivityResult(requestCode, resultCode, data); if (requestCode == 1) { if (resultCode == RESULT_OK) { // 用getIntExtra()獲取用putExtra()設置的整數值 Toast.makeText(this, Integer.toString(data.getIntExtra("age3", 0)), Toast.LENGTH_SHORT).show(); // 用getData()獲取用setData()設置的字符串值 Toast.makeText(this, data.getData().toString(), Toast.LENGTH_SHORT).show(); } } } ~~~ 6、運行,效果如下: 點擊按鈕: ![](https://box.kancloud.cn/2016-08-23_57bc06b6b1bcf.jpg) 出現如下畫面: ![](https://box.kancloud.cn/2016-08-23_57bc06b6e713c.jpg) ![](https://box.kancloud.cn/2016-08-23_57bc06b720d40.jpg) ![](https://box.kancloud.cn/2016-08-23_57bc06b75aa6c.jpg) ![](https://box.kancloud.cn/2016-08-23_57bc06b7897cc.jpg) 消息框消失,點擊按鈕,出現如下畫面: ![](https://box.kancloud.cn/2016-08-23_57bc06b7b9ded.jpg) ![](https://box.kancloud.cn/2016-08-23_57bc06b7e454f.jpg)
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