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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