Android intent实现两个activity相互传值，获得输入框的数据

对应的main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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="wrap_content"
    android:layout_height="wrap_content"
    tools:context="com.example.samsung.myapplication.MainActivity">

<LinearLayout
    android:id="@+id/one"
    android:orientation="horizontal"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">
    <TextView
        android:id="@+id/tv"
        android:text="姓名"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />

    <TextView
        android:id="@+id/tv2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="200dp"
        android:layout_marginStart="200dp"
        android:layout_toEndOf="@+id/tv"
        android:layout_toRightOf="@+id/tv"
        android:text="哈哈" />

</LinearLayout>

</RelativeLayout>

对应第二的activity的布局

<?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="com.example.samsung.myapplication.Main2Activity">
<Button
    android:id="@+id/btn"
    android:text="保存"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />
<TextView
    android:text="名称"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />
    <EditText
        android:id="@+id/name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>

下面来看第一个Activity

public class MainActivity extends AppCompatActivity {
TextView tv2;
LinearLayout one;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
  one = (LinearLayout)findViewById(R.id.one);
  tv2= (TextView)findViewById(R.id.tv2);

  one.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View view) {

          Intent  intent = new Intent(MainActivity.this,Main2Activity.class);
          startActivity(intent);




      }
  });

        Intent intent2 = getIntent();
        //获取传递的值
        String  str = intent2.getStringExtra("data");
 if(str!=null)
 {
     tv2.setText(str);      // 获取意图对象

 }


    }
}

对应的第二个

public class Main2Activity extends AppCompatActivity {
EditText name;
Button btn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

name = (EditText)findViewById(R.id.name);
btn = (Button) findViewById(R.id.btn);



        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String mingzi = name.getText().toString();
                Intent intent = new Intent(Main2Activity.this,MainActivity.class);

                //设置传递键值对
                intent.putExtra("data",mingzi);
                //激活意图
                startActivity(intent);
        /*     startActivityForResult(intent,0);
             finish();*/

Toast.makeText(Main2Activity.this,"输入的事"+mingzi,Toast.LENGTH_SHORT).show();


            }
        });



    }


}