Intent intent=new Intent(registActivity.this,showActivity.class);
//這樣我們構造出了一個Intent

//準備Intent的data屬性數(shù)據(jù)
Uri uri=Uri.parse("http://www.baidu.com");
//設置Intent的action屬性和data屬性
Intent intent=new Intent(Intent.ACTION_VIEW,uri);
//啟動目標意圖
startActivity(intent);

private void passdate()
    {
        //創(chuàng)建意圖對象
        Intent intent=new Intent(registActivity.this,showActivity.class);
        //把數(shù)據(jù)存入intent
        intent.putExtra("name",et_name.getText().toString().trim());
        intent.putExtra("password",et_password.getText().toString().trim());
        //開啟意圖
        startActivity(intent);
    }

//獲得開啟頁面的意圖對象
        Intent intent=getIntent();
        //根據(jù)key取出對應的value值
        String name=intent.getStringExtra("name");
        String password=intent.getStringExtra("password");
        //把用戶名和密碼展示到控件上（覆蓋到控件的位置上）
        TextView tv_name=(TextView) findViewById(R.id.tv_name);
        TextView tv_password=(TextView) findViewById(R.id.tv_psw);
        tv_name.setText(name);
        tv_password.setText(password);

 protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final EditText editText1 = (EditText) findViewById(R.id.et_name);
        Button button1 = (Button) findViewById(R.id.button);
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, showActivity.class);
                Bundle bundle = new Bundle();
                bundle.putCharSequence("name", (CharSequence) editText1.getText().toString());
                //通過bundle來保存數(shù)據(jù)
                intent.putExtras(bundle);
                startActivityForResult(intent, 1);//和startActivity很像，就多了個請求碼用于后面判斷數(shù)據(jù)來源
            }
        });

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_show);
       final EditText editText2= (EditText) findViewById(R.id.show_name);
        Button button2=(Button) findViewById(R.id.show_button);
        //獲取上個活動的intent和bundle
        Intent intent=getIntent();
        Bundle bundle=intent.getExtras();
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(showActivity.this,MainActivity.class);
                Bundle bundle=new Bundle();
                bundle.putCharSequence("edit",(CharSequence) editText2.getText().toString());
                intent.putExtras(bundle);
                //setResult方法用于給上一個活動傳遞數(shù)據(jù)，第一個參數(shù)是返回上一個活動的結果，第二個參數(shù)是將帶有數(shù)據(jù)的intent傳過去
                setResult(1,intent);
                finish();
            }
        });
    }

//在showActivity中的finish被銷毀后,會回調上 一個活動的onActivityResult()方法，因此我們要在MainActivity里重寫這個方法
@Override
//requestCode就是我們啟動時傳入的請求碼,resultCode是返回數(shù)據(jù)時傳入的，data攜帶返回數(shù)據(jù)的intent
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        switch (requestCode) {
            case 1:
                if (resultCode == RESULT_FIRST_USER) {//通過請求碼來判斷數(shù)據(jù)的來源
                    et_name = (EditText) findViewById(R.id.et_name);
                    et_name.setText(data.getStringExtra("edit"));//從data中取值并輸出
                    //通過getStringExtra來獲取傳遞的數(shù)據(jù)
                }
                break;
            default:
        }
    }