Android学习手记(3) Activity间传递数据

1. 简单数据传递

建立两个Activity，名称分别为MainActivity和TheAty，在MainActivity中新建一个Button，id为btnStartAty。在TheAty中新建一个TextView，id为tv。分别加入如下代码：

MainActivity.java

 public class MainActivity extends AppCompatActivity {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         Button button = (Button)findViewById(R.id.btnStartAty);
         button.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 Intent i = new Intent();

                 i.setClass(MainActivity.this, TheAty.class);
                 i.putExtra("data", "hello android");

                 startActivity(i);
             }
         });

     }
 }

TheAty.java

 public class TheAty extends AppCompatActivity {

     private TextView textv;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_the_aty);

         Intent i = getIntent();

         textv = (TextView)findViewById(R.id.tv);
         textv.setText(i.getStringExtra("data"));
     }
 }

其中，Intent i 的作用是作为绑定两个Activity的中介，然后进行string的传递。使用putExtra()的getStringExtra()函数对来实现简单值的传递。

2. 使用Bundle传递数据

MainActivity.java

 public class MainActivity extends AppCompatActivity {

     private EditText myText;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         myText = (EditText)findViewById(R.id.editText);
         Button button = (Button) findViewById(R.id.btnOK);

         button.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 String str = myText.getText().toString();

                 Intent i = new Intent(MainActivity.this, TheAty.class);
                 Bundle bundle = new Bundle();
                 bundle.putString("message", str);

                 i.putExtras(bundle);

                 startActivity(i);
             }
         });

     }
 }

TheAty.java

 public class TheAty extends AppCompatActivity {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_the_aty);

         Bundle bundle = this.getIntent().getExtras();
         String mesg = bundle.getString("message");

         TextView myText = (TextView) findViewById(R.id.tv);
         myText.setText(mesg);
     }
 }

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