Activity间的跳转和数据传递

	Button bt;
        EditText et;
	TextView tv;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.sendimpl);
		bt=(Button) findViewById(R.id.mybut);
		et=(EditText) findViewById(R.id.etqq);
		tv=(TextView) findViewById(R.id.tvdd);
		bt.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				String valueString=et.getText().toString();
				Intent t=new Intent(SendImpl.this,ReviceImpl.class);
				t.putExtra("value", valueString);
				startActivityForResult(t, 1);
			}
		});
	}
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		if(resultCode==RESULT_OK){
			
			String valString=data.getStringExtra("val");
			tv.setText(valString);
			
		}else{
			tv.setText("取消操作");
		}
	}

　　

	TextView tv;
	Button bu;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.recevie);
		tv=(TextView) findViewById(R.id.tvqq);
		bu=(Button) findViewById(R.id.retbut);
		Intent t=getIntent();
		String vaString=t.getStringExtra("value");
		tv.setText(vaString);
		
		bu.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				getIntent().putExtra("val", "second reslut");
				setResult(RESULT_OK,getIntent());
				finish();
			}
		});
	}