Android生命周期

1、Activity跳转

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

跳转到NextActivity

2、带数据跳转

Intent intent = new Intent(MainActivity.this,NextActivity.class);
intent.putExtra("name","YinTing");
Bundle bundle = new Bundle();
bundle.putInt("age",22);
bundle.putChar("bood",'b');
intent.putExtra("bundle",bundle);
startActivity(intent);

3、接收返回值跳转

Intent intent = new Intent(MainActivity.this,NextActivity.class);
intent.putExtra("name","YinTing");
Bundle bundle = new Bundle();
bundle.putInt("age",22);
bundle.putChar("bood",'b');
intent.putExtra("bundle",bundle);
MainActivity.this.startActivityForResult(intent,1);

必须复写onActivityResult该方法。

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(requestCode==1&&resultCode==1001){
       String name= data.getStringExtra("name");
        Toast.makeText(MainActivity.this,"---->"+name,Toast.LENGTH_LONG).show();
    }


}
NextActivity结束时带数据返回。

Intent intent=new Intent();
intent.putExtra("name","YangYi");
NextActivity.this.setResult(1001,intent);
NextActivity.this.finish();

4、Android生命周期

5、Activity现场保护