Intent是Activity之间的管道
可以用来做Acitivity的跳转或传递数据
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
System.out.println("onCreate");
TextView tv = null;
btnStarAty1= (Button)findViewById(R.id.btnStartAty1);
btnStarAty1.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
//从主界面跳转到Aty1
Intent i = new Intent(MainActivity.this,Aty1.class);
//传值
i.putExtra("txt","Hello aty1");
startActivity(i);
}
});
}
Aty1接收值
@Override protected void onCreate(Bundle e){ super.onCreate(e); setContentView(R.layout.aty1); btnClose = (Button)findViewById(R.id.btnClose); btnClose.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v){ finish(); } }); tvOut = (TextView)findViewById(R.id.tvOut); //找到Intent这个管道 tvOut.setText(getIntent().getStringExtra("txt")); }