activity安卓作业 3月5号

public class MainActivity extends AppCompatActivity {
private EditText editText;
private TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

    editText =(EditText)findViewById(R.id.xm);
    textView= (TextView) findViewById(R.id.jl);

    findViewById(R.id.pg).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent=new Intent(MainActivity.this,Main2Activity.class);
            intent.putExtra("date",editText.getText().toString()+"同学你有信心么？");
            startActivityForResult(intent,0);
        }
    });

    findViewById(R.id.exit).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            finish();
        }
    });
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    textView.setText(data.getStringExtra("date"));
}
}

第二个java代码
public class Main2Activity extends AppCompatActivity {
private TextView jl;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);

    jl= (TextView) findViewById(R.id.jl);
    Intent intent=getIntent();
    jl.setText(intent.getStringExtra("date"));

}

public void onClick(View view){
    switch (view.getId()){
        case R.id.yes:
            back("有");
            break;
        case R.id.no:
            back("没有");
            break;
    }
}
public void back(String content){
    Intent intent=new Intent();
    intent.putExtra("date",content);
    setResult(1,intent);
    finish();
}
}

<LinearLayout

        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:orientation="horizontal">

        <Button
            android:id="@+id/pg"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="@string/pg" />

        <Button
            android:id="@+id/exit"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="@string/exit" />
    </LinearLayout>
</LinearLayout>
 <TextView
        android:id="@+id/jl"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:gravity="bottom"
        android:text="@string/jl"
        android:textColor="@color/colorPrimaryDark" />

    <LinearLayout

        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:orientation="horizontal">

        <Button
            android:id="@+id/yes"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="@string/yes" />

        <Button
            android:id="@+id/no"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="@string/no" />
    </LinearLayout>
</LinearLayout>