结对编程

文档说明：

这个demo实现的功能是用户登陆后点击球员的名字可以显示图片

关键代码

public class MainActivity extends AppCompatActivity {
    EditText et_name;
    EditText et_password;
    Button bt_login;

    @Override
    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_passwaord);
        bt_login =(Button)findViewById(R.id.bt_login);
        bt_login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String  name =et_name.getText().toString();
                String  password =et_password.getText().toString();
                if(TextUtils.isEmpty(name)&&TextUtils.isEmpty(password)){
                    Toast.makeText(MainActivity.this,"请输入用户名和密码",Toast.LENGTH_SHORT).show();

                }else if(TextUtils.isEmpty(name)&&password!=null){
                    Toast.makeText(MainActivity.this,"请输入用户名",Toast.LENGTH_SHORT).show();


                }else if(TextUtils.isEmpty(password)&&name!=null){
                    Toast.makeText(MainActivity.this,"请输入密码",Toast.LENGTH_SHORT).show();

                }else{
                    if(name.equals("niit")&&password.equals("123456")) {
                        Toast.makeText(MainActivity.this, "登录成功", Toast.LENGTH_SHORT).show();
                        Intent myIntent = new Intent(MainActivity.this, UserActivity.class);
                        startActivity(myIntent);
                    }else{
                        Toast.makeText(MainActivity.this, "登录失败", Toast.LENGTH_SHORT).show();
                    }
                    }
                }

        });
    }
}

public class UserActivity extends AppCompatActivity {
    Button kb;
    Button back_m;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.userlayout);
        kb=(Button) findViewById(R.id.kb);
        back_m=(Button)findViewById(R.id.back_m) ;
        kb.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent kb = new Intent(UserActivity.this,KobeAcicity_two.class);
                startActivity(kb);
            }
        });
        back_m.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent back_m = new Intent(UserActivity.this,MainActivity.class);
                startActivity(back_m);
            }
        });
    }
}

public class KobeAcicity_two extends Activity {
    private Button btn;
    private ImageView img;
    private String url = "https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=4267085115,1950863501&fm=23&gp=0.jpg";

    
    private Handler handle = new Handler() {
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case 0:
                    System.out.println("111");
                    Bitmap bmp=(Bitmap)msg.obj;
                    img.setImageBitmap(bmp);
                    break;
            }
        };
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.kobelayout);

        btn = (Button) findViewById(R.id.ld);
        img = (ImageView) findViewById(R.id.kobe);

        btn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                
                new Thread(new Runnable() {

                    @Override
                    public void run() {
                        // TODO Auto-generated method stub
                        Bitmap bmp = getURLimage(url);
                        Message msg = new Message();
                        msg.what = 0;
                        msg.obj = bmp;
                        System.out.println("000");
                        handle.sendMessage(msg);
                    }
                }).start();
            }
        });
    }

    
        public Bitmap getURLimage(String url) {
        Bitmap bmp = null;
        try {
            URL myurl = new URL(url);
         
            HttpURLConnection conn = (HttpURLConnection) myurl.openConnection();
            conn.setConnectTimeout(10000);
            conn.setDoInput(true);
            conn.setUseCaches(false);
            conn.connect();
            InputStream is = conn.getInputStream();
            bmp = BitmapFactory.decodeStream(is);
            is.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return bmp;
    }
}