全面解析Android应用开发中Activity类的用法

2019-12-10 18:55:24于海丽

下面是获取数据:

 Intent intent =getIntent();// 收取 email 
 Bundle bundle =intent.getBundleExtra("key");// 打开 email 
 bundle.getBoolean("boolean_key");// 读取内容
 bundle.getString("string_key");

不过使用Bundle传递数据稍显麻烦,如果你只需要传递一种类型的值可以这样:

Intent intent =new Intent(EX06.this,OtherActivity.class); 
 intent.putExtra("boolean_key", true); 
 intent.putExtra("string_key", "string_value"); 
 startActivity(intent);

获取数据:

Intent intent=getIntent(); 
 intent.getBooleanExtra("boolean_key",false); 
 intent.getStringExtra("string_key");

2. 通过静态变量传递数据
适用于不可序列化的且简单的对象,不过不推荐使用静态代码块

public class MainActivity extends Activity { 
  private Button btn; 
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    btn = (Button)findViewById(R.id.btOpenOtherActivity); 
    btn.setOnClickListener(new OnClickListener() { 
      @Override 
      public void onClick(View v) { 
        //定义一个意图 
        Intent intent = new Intent(MainActivity.this,OtherActivity.class); 
        //改变OtherActivity的三个静态变量的值 
        OtherActivity.name = "wulianghuan"; 
        OtherActivity.age = "22"; 
        OtherActivity.address = "上海闵行"; 
        startActivity(intent); 
      } 
    }); 
  } 
}
public class OtherActivity extends Activity { 
  public static String name; 
  public static String age; 
  public static String address; 
  private TextView text_name; 
  private TextView text_age; 
  private TextView text_address; 

  @Override 
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.other); 
    text_name = (TextView) findViewById(R.id.name); 
    text_age = (TextView) findViewById(R.id.age); 
    text_address = (TextView) findViewById(R.id.address);   
    //设置文本框的数据 
    text_name.setText("姓名:"+name); 
    text_age.setText("年龄:"+age); 
    text_address.setText("地址:"+address); 
  } 
}