Android使用Intent实现页面跳转

什么是Intent

Intent可以理解为信使（意图）
由Intent来协助完成Android各个组件之间的通讯

Intent实现页面之间的跳转

1>startActivity(intent)
2>startActivityForResult(intent,requestCode)
onActivityResult(int requestCode,int resultCode,Intent data)
setResult(resultCode,data)
第二种启动方式可以返回结果

代码

FirstActivity.java

public class FirstActivity extends AppCompatActivity {
  private Button bt1;
  private Button bt2;
  private TextView tv;
  private Context context=FirstActivity.this;

  protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.first_layout);

    bt1 = (Button) findViewById(R.id.button_first);
    bt2 = (Button) findViewById(R.id.button_second);
    tv = (TextView) findViewById(R.id.textView);
    
    bt1.setonClickListener(new View.onClickListener() {
      public void onClick(View view) {
 
 //Intent intent = new Intent(FirstActivity.this,SecondActivity.class);
 Intent intent = new Intent(context,SecondActivity.class);
 startActivity(intent);
      }
    });

    
    bt2.setonClickListener(new View.onClickListener() {
      public void onClick(View view) {
 Intent intent = new Intent(context,SecondActivity.class);
 
 startActivityForResult(intent,1);
      }
    });
  }
  
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(requestCode == 1 && resultCode == 3){
      String value = data.getStringExtra("data");
      tv.setText(value);
    }
  }
}

SecondActivity.java

public class SecondActivity extends Activity {
  private Button bt1;
  private String value="回传数据";

  protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.second_layout);

    bt1 = (Button) findViewById(R.id.button);
    

    bt1.setonClickListener(new View.onClickListener() {
      public void onClick(View view) {
 Intent data = new Intent();//使用空参就行，因为我们不跳转
 data.putExtra("data",value);
 setResult(3,data);
 finish();//销毁本页面,也就是返回上一页面
      }
    });
  }
}

first_layout.xml

second_layout.xml

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。