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//创建意图对象

 Intent intent = new Intent(this,TwoActivity.class);

 //设置传递键值对

 intent.putExtra("data",str);

 //激活意图

 startActivity(intent);

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// 获取意图对象

 Intent intent = getIntent();

 //获取传递的值

 String str = intent.getStringExtra("data");

 //设置值

 tv.setText(str);

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//创建意图对象

 Intent intent = new Intent(MainActivity.this,TwoActivity.class);

 //用数据捆传递数据

 Bundle bundle = new Bundle();

 bundle.putString("data", str);

 //把数据捆设置改意图

 intent.putExtra("bun", bundle);

 //激活意图

 startActivity(intent);

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//获取Bundle

 Intent intent = getIntent();

 Bundle bundle = intent.getBundleExtra("bun");

 String str = bundle.getString("data");

 tv.setText(str);

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  Intent intent = new Intent(MainActivity.this,TwoActivity.class);

  //用一种特殊方式开启Activity

 startActivityForResult(intent, 11);

//设置数据

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

 super.onActivityResult(requestCode, resultCode, data);

 String str = data.getStringExtra("data");

 tvOne.setText(str);

}

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//设置返回的数据

 Intent intent = new Intent();

 intent.putExtra("data", edtOne.getText().toString().trim());

 setResult(3, intent);

 //关闭当前activity

 finish();

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SharedPreferences sp = this.getSharedPreferences("info", 1);

 //获取sp编辑器

 Editor edit = sp.edit();

 edit.putString("data", str);

 edit.commit();

 //创建意图对象

 Intent intent = new Intent(MainActivity.this,TwoActivity.class);

 //激活意图

 startActivity(intent);

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SharedPreferences sp = this.getSharedPreferences("info", 1);

 //设置数据

 tv.setText(sp.getString("data", ""));

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import java.io.Serializable;

class DataBean implements Serializable {

 private String name;

 private String sex;

 public String getName() {

 return name;

 }

 public void setName(String name) {

 this.name = name;

 }

 public String getSex() {

 return sex;

 }

 public void setSex(String sex) {

 this.sex = sex;

 }

}

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//创建意图

 Intent intent = new Intent(MainActivity.this,TwoActivity.class);

 DataBean bean = new DataBean();

 //通过set方法把数据保存到DataBean对象中

 bean.setName("啦啦");

 bean.setSex("男");

 intent.putExtra("key", bean);

 startActivity(intent);

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Intent intent = getIntent();

 //反序列化数据对象

 Serializable se = intent.getSerializableExtra("key");

 if(se instanceof DataBean){

  //获取到携带数据的DataBean对象db

  DataBean db = (DataBean) se;

  tv.setText(db.getName()+"==="+db.getSex());

 }

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Intent intent = new Intent(MainActivity.this,TwoActivity.class);

  TwoActivity.name="牛逼";

  TwoActivity.str="你说";

  startActivity(intent);

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//静态变量

protected static String name;

protected static String str;

tv.setText(str+name);