Intent 传值示例

MainActivity ------ MyActivity

  Note: 1, 接收返回值时需要重载onActivityResult（）

　　　　2, 在设置返回resultCode时，要使用 setResult (int resultCode, Intent data)

【MainActivity.java】

package sanyo.com.intent002;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {

	private Button button;
	private TextView textView;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		button = (Button)findViewById(R.id.button_main);
		textView = (TextView)findViewById(R.id.textview_main);
		
		button.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				Intent intent = new Intent(MainActivity.this, MyActivity.class);
				//startActivity(intent);
				intent.putExtra("sanyo.com.intent002", "Hello MyActivity!");
				startActivityForResult(intent, 123);
			}
		});
		
	}

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		// TODO Auto-generated method stub
		super.onActivityResult(requestCode, resultCode, data);
		
		if (resultCode == 222) {
			String resultValue = data.getExtras().getString("sanyo.com.intent002");
			textView.setText(resultValue);
		}
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

【MyActivity.java】

package sanyo.com.intent002;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MyActivity extends Activity {

	private Button button;
	private TextView textView;
	Intent mIntent;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		
		setContentView(R.layout.layout_myactivity);
		button = (Button)findViewById(R.id.button1);
		textView = (TextView)findViewById(R.id.textView1);
		
		mIntent = getIntent();
		String	getString = mIntent.getStringExtra("sanyo.com.intent002");
		textView.setText(getString);
		Toast.makeText(getApplicationContext(), "I am MyActivity!", Toast.LENGTH_LONG).show();

		button.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub								
				mIntent.putExtra("sanyo.com.intent002", "How are you MainActivity!");
				setResult(222, mIntent);
				finish();
			}
		});
		
	}

}

【实现效果截图】