//創(chuàng)建意圖對象
 Intent intent = new Intent(this,TwoActivity.class);
 //設置傳遞鍵值對
 intent.putExtra("data",str);
 //激活意圖
 startActivity(intent);

// 獲取意圖對象
 Intent intent = getIntent();
 //獲取傳遞的值
 String str = intent.getStringExtra("data");
 //設置值
 tv.setText(str);

//創(chuàng)建意圖對象
 Intent intent = new Intent(MainActivity.this,TwoActivity.class);
 //用數據捆傳遞數據
 Bundle bundle = new Bundle();
 bundle.putString("data", str);
 //把數據捆設置改意圖
 intent.putExtra("bun", bundle);
 //激活意圖
 startActivity(intent);

//獲取Bundle
 Intent intent = getIntent();
 Bundle bundle = intent.getBundleExtra("bun");
 String str = bundle.getString("data");
 tv.setText(str);

  Intent intent = new Intent(MainActivity.this,TwoActivity.class);
  //用一種特殊方式開啟Activity
 startActivityForResult(intent, 11);
//設置數據
 
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
 super.onActivityResult(requestCode, resultCode, data);
 String str = data.getStringExtra("data");
 tvOne.setText(str);
}

//設置返回的數據
 Intent intent = new Intent();
 intent.putExtra("data", edtOne.getText().toString().trim());
 setResult(3, intent);
 //關閉當前activity
 finish();

SharedPreferences sp = this.getSharedPreferences("info", 1);
 //獲取sp編輯器
 Editor edit = sp.edit();
 edit.putString("data", str);
 edit.commit();
 //創(chuàng)建意圖對象
 Intent intent = new Intent(MainActivity.this,TwoActivity.class);
 //激活意圖
 startActivity(intent);

SharedPreferences sp = this.getSharedPreferences("info", 1);
 //設置數據
 tv.setText(sp.getString("data", ""));

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;
 }
}

//創(chuàng)建意圖
 Intent intent = new Intent(MainActivity.this,TwoActivity.class);
 DataBean bean = new DataBean();
 //通過set方法把數據保存到DataBean對象中
 bean.setName("啦啦");
 bean.setSex("男");
 intent.putExtra("key", bean);
 startActivity(intent);

Intent intent = getIntent();
 //反序列化數據對象
 Serializable se = intent.getSerializableExtra("key");
 if(se instanceof DataBean){
  //獲取到攜帶數據的DataBean對象db
  DataBean db = (DataBean) se;
  tv.setText(db.getName()+"==="+db.getSex());
 }

Intent intent = new Intent(MainActivity.this,TwoActivity.class);
  TwoActivity.name="牛逼";
  TwoActivity.str="你說";
  startActivity(intent);

//靜態(tài)變量
protected static String name;
protected static String str;
tv.setText(str+name);