1、使用Intent向下傳遞數據

Intent intent = new Intent(MainActivity.this,SecongActivity.class); intent.putExtra("data_from_MainActivity","I am MainActivity"); startActivity(intent);從SecondActivity取數據

Intent intent = getIntent(); String data = intent.getStringExtra("data_from_MainActivity");根據傳遞的數據的類型選擇getIntExtra()/getBooleanExtra...

2、向上傳遞數據

MainActivity.java

Intent intent1 = new Intent("sunny.example.comeonintent.ACTION"); startActivityForResult(intent1,1);期望返回數據

startActivityForResult()

void android.support.v4.app.FragmentActivity.startActivityForResult(Intent intent, int requestCode)

SubActivity.java

Intent intent = new Intent(); intent.putExtra("data_from_sub", "I am Sub"); setResult(RESULT_OK,intent);//RESULT_OK -1;RESULT_CANCELED 0;在MainActivity中接收數據

<span style="white-space:pre"> </span>@Overrideprotected void onActivityResult(int RequestCode,int ResultCode,Intent data){TextView tv1 = (TextView)findViewById(R.id.tv1);TextView tv2 = (TextView)findViewById(R.id.tv2);switch(RequestCode){case 1:if(ResultCode == RESULT_OK){String returnData1 = data.getStringExtra("data_from_sub");tv1.setText(returnData1);}else{}case 2:if(ResultCode == RESULT_OK){String returnData2 = data.getStringExtra("data_from_third");tv2.setText(returnData2);}else{}default:}} 完整代碼在：https://github.com/HiSunny/ComeOnIntent.git

總結

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