类微信界面设计2

一.设计要求：在上一次设计的基础上进行补充，实现activityforresult功能。

二.设计步骤

1.新建一个新的activity2，recycleview的某一项点击后跳转到这个新的activity2

activity_2.xml，代码如下：

2.编写activity通过点击button接收到resultActivity的回传值，以及观察activity的生命周期

package com.example.mywork;import androidx.activity.result.ActivityResult;
import androidx.activity.result.ActivityResultCallback;
import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.appcompat.app.AppCompatActivity;import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.TextView;public class Activity2 extends AppCompatActivity {private Button button;private TextView textView;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);supportRequestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_2);textView=findViewById(R.id.textView10);button=findViewById(R.id.button);button.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {Intent intent=new Intent(Activity2.this,resultActivity.class);test.launch(intent);}});}public ActivityResultLauncher test= registerForActivityResult(new ActivityResultContracts.StartActivityForResult(),new ActivityResultCallback() {@Overridepublic void onActivityResult(ActivityResult result) {if(result.getResultCode()==666){Log.d("lx","onActivityResult 有返回值。。。");textView.setText(result.getData().getStringExtra("data"));};}});@Overrideprotected void onStart() {super.onStart();Log.d("lx","activity2 is onStart...");}@Overrideprotected void onRestart() {super.onRestart();Log.d("lx","activity2 is onRestart...");}@Overrideprotected void onStop() {super.onStop();Log.d("lx","activity2 is onStop...");}@Overrideprotected void onDestroy() {super.onDestroy();Log.d("lx","activity2 is onDestroy...");}@Overridepublic void finish(){super.finish();Log.d("lx","activity2 is finish...");}@Overridepublic void finishActivity(int requestCode){super.finishActivity(requestCode);Log.d("lx","finishActivity2...");}
}

2.新建一个新的resultActivity 完成向activity2传值的功能

package com.example.mywork;import androidx.appcompat.app.AppCompatActivity;import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;import java.util.Calendar;public class resultActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_result);Intent intent =getIntent();intent.putExtra("data","今天是xr老师讲授的安卓课。\n"+Calendar.getInstance().getTime());setResult(Activity.RESULT_OK,intent);finish();}
}

制作效果

本文来自互联网用户投稿，文章观点仅代表作者本人，不代表本站立场，不承担相关法律责任。如若转载，请注明出处。 如若内容造成侵权/违法违规/事实不符，请点击【内容举报】进行投诉反馈！