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
1 public class MainActivity extends AppCompatActivity { 2 3 @Override 4 protected void onCreate(Bundle savedInstanceState) { 5 super.onCreate(savedInstanceState); 6 setContentView(R.layout.activity_main); 7 8 Button button = (Button)findViewById(R.id.btnStartAty); 9 button.setOnClickListener(new View.OnClickListener() { 10 @Override 11 public void onClick(View v) { 12 Intent i = new Intent(); 13 14 i.setClass(MainActivity.this, TheAty.class); 15 i.putExtra("data", "hello android"); 16 17 startActivity(i); 18 } 19 }); 20 21 } 22 }
TheAty.java
1 public class TheAty extends AppCompatActivity { 2 3 private TextView textv; 4 5 @Override 6 protected void onCreate(Bundle savedInstanceState) { 7 super.onCreate(savedInstanceState); 8 setContentView(R.layout.activity_the_aty); 9 10 Intent i = getIntent(); 11 12 textv = (TextView)findViewById(R.id.tv); 13 textv.setText(i.getStringExtra("data")); 14 } 15 }
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
1 public class MainActivity extends AppCompatActivity { 2 3 private EditText myText; 4 5 @Override 6 protected void onCreate(Bundle savedInstanceState) { 7 super.onCreate(savedInstanceState); 8 setContentView(R.layout.activity_main); 9 10 myText = (EditText)findViewById(R.id.editText); 11 Button button = (Button) findViewById(R.id.btnOK); 12 13 button.setOnClickListener(new View.OnClickListener() { 14 @Override 15 public void onClick(View v) { 16 String str = myText.getText().toString(); 17 18 Intent i = new Intent(MainActivity.this, TheAty.class); 19 Bundle bundle = new Bundle(); 20 bundle.putString("message", str); 21 22 i.putExtras(bundle); 23 24 startActivity(i); 25 } 26 }); 27 28 } 29 }
TheAty.java
1 public class TheAty extends AppCompatActivity { 2 3 @Override 4 protected void onCreate(Bundle savedInstanceState) { 5 super.onCreate(savedInstanceState); 6 setContentView(R.layout.activity_the_aty); 7 8 Bundle bundle = this.getIntent().getExtras(); 9 String mesg = bundle.getString("message"); 10 11 TextView myText = (TextView) findViewById(R.id.tv); 12 myText.setText(mesg); 13 } 14 }
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