android startActivityForResult(Intent intent, int requestCode)用法

最新推荐文章于 2023-02-25 11:54:09 发布

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本文介绍如何在Android应用中实现不同Activity间的通信。通过使用startActivityForResult()启动一个新Activity，并在onActivityResult()中接收返回结果。同时展示了如何在被启动的Activity中设置返回结果并结束自身。

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If you want to receive a result from the activity when it finishes,callstartActivityForResult(). Your activity receives the resultas a separateIntent object in your activity'sonActivityResult() callback.

主要是涉及到两个Activity之间的通信

1. MainActivity.java onActivityResult()回调函数, 接收从NextActivity返回的结果值

<span style="font-size:10px;color:#993300;">private OnClickListener onClickListener = new View.OnClickListener() {
		@Override
		public void onClick(View arg0) {
			Intent intent = new Intent(MainActivity.this, NextActivity.class);
			startActivityForResult(intent, 1);
		}
	};

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		switch (requestCode) {
		case 1:
			Bundle bundleData = data.getExtras();
			Log.d("MainActivity",
					"000000000000 --- " + bundleData.getInt("num"));
			break;

		default:
			break;
		}
		super.onActivityResult(requestCode, resultCode, data);
	}</span>

2. NextActivity.java setResult()传递结果值

<span style="font-size:10px;color:#993300;">finishButton.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View arg0) {
				Intent intent = new Intent();
				Bundle data = new Bundle();
				data.putInt("num", 1);
				intent.putExtras(data);
				NextActivity.this.setResult(RESULT_OK, intent);
				NextActivity.this.finish();
			}
		});</span>