深入Activity ( 1 )

第一个xml

第二个xml android:weightSum="1">

第一个xml的java

import...
public class MainActivity extends AppCompatActivity {

private EditText xm_text;
private Button bt_pinggu,bt_tuicu;
private TextView yf_tv;

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

xm_text=(EditText)findViewById(R.id.xm_text);
bt_pinggu=(Button)findViewById(R.id.bt_pg);
bt_tuicu=(Button)findViewById(R.id.bt_tc);

String data="";
Intent intent=getIntent();
String jg=intent.getStringExtra("result");
TextView yftv=(TextView)findViewById(R.id.yf_tv);
data = jg;
yf_tv.setText(data);

}

public void onClick(View view) {
switch (view.getId()) {
case R.id.bt_pinggu:
PG();
case R.id.xm_text:
case R.id.bt_tuicu:
finish();
break;
}
}

private void PG() {
Intent intent = new Intent(MainActivity.this, Main.class);
String text =xm_text.getText().toString();
intent.putExtra("name",text+"学生:对学习安卓有没有信心？");
startActivity(intent);
}

}
第二个xml的java

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

private EditText xm_text;
private Button bt_pg,bt_tc;
private TextView yf_tv;

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

xm_text=(EditText)findViewById(R.id.xm_text);
bt_pg=(Button)findViewById(R.id.bt_pinggu);
bt_tc=(Button)findViewById(R.id.bt_tuicu);

String data="";
Intent intent=getIntent();
String jg=intent.getStringExtra("result");
TextView yftv=(TextView)findViewById(R.id.yf_tv);
data = jg;
yftv.setText(data);

}

public void onClick(View view) {
switch (view.getId()) {
case R.id.bt_pinggu:
back("有信心");
break;
case R.id.xm_text:
case R.id.bt_tuicu:
back("没有信心");
break;
finish();
break;
}
}

private void PG() {
Intent intent = new Intent(MainActivity.this, Main.class);
String text =xm_text.getText().toString();
intent.putExtra("name",text+"学生:对学习安卓有没有信心？");
startActivity(intent);
}

}