Android四大组件详解之Activity数据传递及回传（初级）

秒速五厘米 2022-01-31 23:45 186阅读 0赞

## 内容：Activity数据传递及回传 ##

## 功能： ##

*  注册后，将注册信息显示在另一个页面（数据传递）
 *  重新封装一个工具类，通过数据回传将数值加给基础数据（数据回传）

# 用到的知识点： #

*  页面的跳转
 *  页面间数据的传递
 *  页面数据的回传  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDIyODE5NA_size_16_color_FFFFFF_t_70]  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDIyODE5NA_size_16_color_FFFFFF_t_70 1]  
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    MainActivity

ShopActivity

ShowActivity

==MainActivity.java ==

public class MainActivity extends AppCompatActivity {
        private EditText et_password;
        private Button button_send;
        private EditText et_name;
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            et_name =(EditText) findViewById(R.id.et_name);
            et_password =(EditText) findViewById(R.id.et_password);
            button_send = (Button) findViewById(R.id.button_send);
            button_send.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                    passData();
                }
            });
        }
        public void passData(){
            Intent intent = new Intent(this,ShowActivity.class);
            intent.putExtra("name",et_name.getText().toString().trim());
            intent.putExtra("password",et_password.getText().toString().trim());
            startActivity(intent);
        }
    }

==ShopActivity.java ==

public class ShopActivity extends AppCompatActivity implements
    View.OnClickListener{
        private ItemInfo itemInfo;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_shop);
            itemInfo = new ItemInfo("金剑",100,20,20);
            findViewById(R.id.r1).setOnClickListener(this);
            TextView mLifeTV = (TextView) findViewById(R.id.tv_life);
            TextView mNameTV = (TextView) findViewById(R.id.tv_name);
            TextView mSpeedTV = (TextView) findViewById(R.id.tv_speed);
            TextView mAttackTV = (TextView) findViewById(R.id.tv_attack);
            mLifeTV.setText("生命值+"+ itemInfo.getLife());
            mNameTV.setText(itemInfo.getName()+"");
            mSpeedTV.setText("敏捷度+"+ itemInfo.getSpeed());
            mAttackTV.setText("攻击力+"+ itemInfo.getAttack());
        }
        @Override
        public void onClick(View v) {
            switch (v.getId()) {
                case R.id.r1:
                    Intent intent = new Intent();
                    intent.putExtra("equipment",itemInfo);
                    setResult(1, intent);
                    finish();
                    break;
            }
        }
    }

==ShowActivity.java ==

public class ShowActivity extends AppCompatActivity {
        private ProgressBar mProgressBar1;
        private ProgressBar mProgressBar2;
        private ProgressBar mProgressBar3;
        private TextView mLifeTV;
        private TextView mAttackTV;
        private TextView mSpeedTV;
        private TextView tv_name;
        private TextView tv_password;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_show);
            Intent intent = getIntent();
            String name = intent.getStringExtra("name");
            String password =intent.getStringExtra("password");
            tv_name =(TextView) findViewById(R.id.tv_name);
            tv_password =(TextView) findViewById(R.id.tv_password);
            tv_name.setText("用户名："+name);
            tv_password.setText("密码"+password);
            mLifeTV = (TextView) findViewById(R.id.tv_life_progress);
            mAttackTV = (TextView) findViewById(R.id.tv_attack_progress);
            mSpeedTV = (TextView) findViewById(R.id.tv_speed_progress);
            initProgress();
        }
        private void initProgress() {
            mProgressBar1 = (ProgressBar) findViewById(R.id.progressbar1);
            mProgressBar2 = (ProgressBar) findViewById(R.id.progressbar2);
            mProgressBar3 = (ProgressBar) findViewById(R.id.progressbar3);
            mProgressBar1.setMax(1000);
            mProgressBar2.setMax(1000);
            mProgressBar3.setMax(1000);
        }
        public void click(View view) {
            Intent intent = new Intent(this,ShopActivity.class);
            startActivityForResult(intent, 1);
        }
        @Override
        protected void onActivityResult(int requestCode,
                                        int resultCode,Intent data) {
            super.onActivityResult(requestCode, resultCode, data);
            if (data !=null) {
                if (requestCode ==1) {
                    if (resultCode ==1) {
                        ItemInfo info =
                                (ItemInfo) data.getSerializableExtra("equipment");
                        updataProgress(info);
                    }
                }
            }
        }
        private  void updataProgress(ItemInfo info) {
            int Progress1 = mProgressBar1.getProgress();
            int Progress2 = mProgressBar1.getProgress();
            int Progress3 = mProgressBar1.getProgress();
            mProgressBar1.setProgress(Progress1 + info.getLife());
            mProgressBar2.setProgress(Progress2 + info.getAttack());
            mProgressBar3.setProgress(Progress3 + info.getSpeed());
            mLifeTV.setText(mProgressBar1.getProgress() + "");
            mAttackTV.setText(mProgressBar2.getProgress()+"");
            mSpeedTV.setText(mProgressBar3.getProgress()+"");
        }
    }

ItemInfo .java

public class ItemInfo implements Serializable {
        private String name;
        private int attack;
        private int life;
        private int speed;
        public ItemInfo(String name,int attack,int life,int speed){
            this.name = name;
            this.attack = attack;
            this.life = life;
            this.speed = speed;
        }
        public String getName(){
            return name;
        }
        public void setName(String name){
            this.name = name;
        }  
        public int getAttack(){
            return attack;
        }
        public void setAttack(int attack){
            this.attack = attack;
        }
        public int getLife(){
            return life;
        }
        public void setLife(int life){
            this.life = life;
        }
        public int getSpeed(){
            return speed;
        }
        public void setSpeed(int speed){
            this.speed = speed;
        }
    }

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