获取EditText控件的值：

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String string = editText1.getText().toString() ;

demo：在一个页面做两个输入框一个按钮，填入数字，并将乘积显示在另一个页面

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MainActivity代码
public class MainActivity extends AppCompatActivity {
    private EditText edittext1;
    private EditText edittext2;
    private Button send;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        edittext1 = (EditText)findViewById(R.id.edit_text1);
        edittext2 = (EditText)findViewById(R.id.edit_text2);
        send = (Button)findViewById(R.id.send);
        send.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //获取两个输入框的值
                String string = edittext1.getText().toString();
                String string1 = edittext2.getText().toString();

                //putExtra用来传递键值
                Intent intent = new Intent();
                intent.putExtra("one" , string);
                intent.putExtra("two" , string1);
                intent.setClass(MainActivity.this, OtherActivity.class);
                startActivity(intent);
            }
        });
    }


}
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public class OtherActivity extends AppCompatActivity{
    private TextView text3;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_other);
        text3 = (TextView)findViewById(R.id.text3);

        //获取intent，以及键值
        Intent intent = getIntent();
        String value1 = intent.getStringExtra("one");
        String value2 = intent.getStringExtra("two");

        //因为string不能运算，所以需要将string类型转为int类型
        int i = Integer.parseInt(value1);  //sring类型转为int类型写法
        int j = Integer.parseInt(value2);
        int value = i * j ;  //输入框两数字相乘

        text3.setText(value + ""); //TextView只接收字符串，而value是整型，按照JAVA语法：连接符两端有一端是字符串，另外一端也会被转为字符串，所以加上了一个空字符
        }
}