使用Intent传值及回传值

简单传值

FirstActivity.java

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findViewById(R.id.button).setOnClickListener(new View.OnClickListener(){     @Override     public void onClick(View v) {         Intent intent = new Intent(FirstActivity.this, SecondActivity.class);         intent.putExtra("extra_data","data"); // 传字符串, 更多传值方法         startActivity(intent);     } });

SecondActivity.java

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@Override   protected void onCreate(Bundle savedInstanceState) {       super.onCreate(savedInstanceState);       setContentView(R.layout.activity_second);       // 获取Intent对象       Intent intent = getIntent();       // 根据key获取value       String extra_data = intent.getStringExtra("extra_data");       // 获取一个没有的可以 结果 null       String extra_data2 = intent.getStringExtra("extra_data2");       Log.i(TAG, "onCreate: " + extra_data + extra_data2);  }

回传值:

修改FirstActivity.java

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/**  * 监听获取activity返回的数据  * @param requestCode 传入的请求码  * @param resultCode 处理结果码  * @param data intent数据  */ @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) {     switch (requestCode) {         case 1:             if (resultCode == RESULT_OK) {                 String resultData = data.getStringExtra("data_return");                 Log.i(TAG, "onActivityResult: " + resultData);             }             break;         default:     } }

修改SecondActivity.java

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button = (Button) findViewById(R.id.button2); button.setOnClickListener(new View.OnClickListener() {     @Override     public void onClick(View v) {         Intent intent = new Intent();         intent.putExtra("data_return", "hello FirstActivity");         // 给上一个活动返回数据         setResult(RESULT_OK, intent);// 回调(FirstActivity.java中)onActivityResult方法         finish();     } });