Activity的生命周期和跳转

武飞扬头像

m0_57051785

2024-03-25 帮助3人

1.

在 Adapter 里面直接对控件做点击事件

@Override

public void onBindViewHolder(@NonNull XxxViewHolder holder, int position) {

holder.控件名.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

// TODO:

}

});

}

在 Adapter 里写接口

public interface OnItemClickListener {

void onItemClick(参数类型参数名 , ...);

}

private OnItemClickListener mListener;

public XxxAdapter(Context context, OnItemClickListener listener) {

mContext = context;

mListener = listener;

}

@Override

public void onBindViewHolder(@NonNull XxxViewHolder holder, int position) {

holder.控件名.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

mListener.onItemClick(content);

}

});

}

在 Activity 或 Fragment 上实现接口中定义的方法

public class XxxActivity extends AppCompatActivity implements XxxAdapter.OnItemClickListener

XxxAdapter adapter = new XxxAdapter(context, this);

@Override

public void onItemClick(String content) {

// TODO:

}

<?xml version="1.0" encoding="utf-8"?>

activity_main1.xml

xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="50dp"

xmlns:tools="http://schemas.android.com/tools"

android:layout_margin="8dp"

android:background="@drawable/common_bg"

android:orientation="vertical">

<TextView

android:id="@ id/textView1"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_centerVertical="true"

android:layout_marginLeft="8dp"

android:gravity="center"

android:text="TextView" />

</LinearLayout>

activity_main2.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:gravity="center"

android:orientation="vertical"

tools:context=".MainActivity2">

<TextView

android:id="@ id/textView7"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:gravity="center"

android:text="这是第一个activity"

android:textSize="40sp" />

</LinearLayout>

activity_main3.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MainActivity3">

<TextView

android:id="@ id/textView5"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:gravity="center"

android:text="新闻详情"

android:textSize="40dp" />

</LinearLayout>

新闻列表

ackage com.example.myworkgwl01;

import android.content.Context;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.app.Fragment;

import com.example.myworkgwl01.Myadapter;

import androidx.annotation.Nullable;

import androidx.recyclerview.widget.ItemTouchHelper;

import androidx.recyclerview.widget.LinearLayoutManager;

import androidx.recyclerview.widget.RecyclerView;

import java.util.ArrayList;

import java.util.List;

public class contactFragment extends Fragment {

private RecyclerView recyclerView;

private Myadapter myadapter;

private List<String> list = new ArrayList<>();

private Context context;

public contactFragment() {

// Required empty public constructor

}

private void initData(){

for(int i=0;i<30;i ) {

list.add("最新新闻" i );

}

}

private void initView3(){

context=this.getActivity();

myadapter=new Myadapter(list,context);

LinearLayoutManager manager3=new LinearLayoutManager(context);

manager3.setOrientation(LinearLayoutManager.VERTICAL);

recyclerView.setAdapter(myadapter);

recyclerView.setLayoutManager(manager3);

}

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

// Inflate the layout for this fragment

// return inflater.inflate(R.layout.contact, container, false);

View view = inflater.inflate(R.layout.contact, container, false);

recyclerView=view.findViewById(R.id.recycleview);

initData();

initView3();

return view;

}

}

Mainactivity2

package com.example.myworkgwl01;

import androidx.annotation.Nullable;

import androidx.appcompat.app.AppCompatActivity;

import androidx.recyclerview.widget.RecyclerView;

import android.content.Intent;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.widget.Button;

public class MainActivity2 extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main2);

}

@Override

protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {

super.onActivityResult(requestCode, resultCode, data);

if(resultCode==31){

String state=data.getStringExtra("state");

Log.d("life",state);

}

}

@Override

protected void onStart() {

super.onStart();

Log.d("life","activity1 is onStart...");

}

@Override

protected void onPostResume() {

super.onPostResume();

Log.d("life","activity1 is onPostResume...");

}

@Override

protected void onRestart() {

super.onRestart();

Log.d("life","activity1 is onReStart...");

}

@Override

protected void onPause() {

super.onPause();

Log.d("life","activity1 is onPause...");

}

@Override

protected void onStop() {

super.onStop();

Log.d("life","activity1 is onStop...");

}

@Override

protected void onDestroy() {

super.onDestroy();

Log.d("life","activity1 is onDestroy...");

}

@Override

public void finish() {

super.finish();

Log.d("life","activity1 is finish...");

}

@Override

public void finishActivity(int requestCode) {

super.finishActivity(requestCode);

Log.d("life","activity1 is finishActivity...");

}

}

Mainactivity3

package com.example.myworkgwl01;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

import android.util.Log;

public class MainActivity3 extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main3);

}

@Override

protected void onPostResume() {

super.onPostResume();

Log.d("life", "activity2 is onPostResume...");

}

@Override

protected void onStart() {

super.onStart();

Log.d("life", "activity2 is onStart...");

}

@Override

protected void onRestart() {

super.onRestart();

Log.d("life", "activity2 is onReStart...");

}

@Override

protected void onStop() {

super.onStop();

Log.d("life", "activity2 is onStop...");

}

@Override

protected void onDestroy() {

super.onDestroy();

Log.d("life", "activity2 is onDestroy...");

}

@Override

protected void onPause() {

super.onPause();

Log.d("life", "activity2 is onPause...");

}

@Override

public void finish() {

super.finish();

Log.d("life", "activity2 is finish...");

}

@Override

public void finishActivity(int requestCode) {

super.finishActivity(requestCode);

Log.d("life", "activity2 is finishActivity...");

}

}

2.

public class MainActivity extends Activity {

private final static String TAG="MainActivity";

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

Button btnOpen=(Button)this.findViewById(R.id.btnOpen);

btnOpen.setOnClickListener(new View.OnClickListener(){

public void onClick(View v) {

//第二个参数为请求码，可以根据业务需求自己编号

startActivityForResult(new Intent(MainActivity.this, OtherActivity.class), 1);

}

});

}

/**

* 为了得到传回的数据，必须在前面的Activity中（指MainActivity类）重写onActivityResult方法

*

* requestCode 请求码，即调用startActivityForResult()传递过去的值

* resultCode 结果码，结果码用于标识返回数据来自哪个新Activity

*/

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

String result = data.getExtras().getString("result");//得到新Activity 关闭后返回的数据

Log.i(TAG, result);

}

}

public class OtherActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.other);

Button btnClose=(Button)findViewById(R.id.btnClose);

btnClose.setOnClickListener(new View.OnClickListener(){

public void onClick(View v) {

//数据是使用Intent返回

Intent intent = new Intent();

//把返回数据存入Intent

intent.putExtra("result", "My name is linjiqin");

//设置返回数据

OtherActivity.this.setResult(RESULT_OK, intent);

//关闭Activity

OtherActivity.this.finish();

}

});

}

}

Gitee 企业版https://e.gitee.com/hubei-university_2/projects/394677/tasks/table?issue_type_category=task&issue=I5W99F

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