如何將文本從一個活動發送到另一個活動？

Question

created.java ：（此命令必須顯示calculated.xml布局）

public class Calculated extends Activity {


   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.calculated);

   }
}

較舊：

主類：

 package com.barth.appie;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.EditText;


public class MainActivity extends Activity {


Button button1;
String text;


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

public void addListenerOnButton() {

    button1 = (Button) findViewById(R.id.buttoncalculate);
    button1.setOnClickListener(new View.OnClickListener() {

    public void onClick(View view) {

        EditText editText = (EditText)findViewById(R.id.editText1);
        String text = editText.getText().toString();

             Intent myIntent = new Intent(view.getContext(),    Calculated.class);
             startActivityForResult(myIntent, 0);

        }
    });
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}



}

計算的.xml ：（這是按鈕按下后必須顯示的內容）

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="42dp"
    android:text="@string/text"
    android:textAppearance="?android:attr/textAppearanceLarge" />

</RelativeLayout>

此外，我在strings.xml上具有<string name="text">Value</string> ，在另一個名為calculated.class的類中，我擁有它，以便它輸出calculated.xml（效果很好）

我想要的是：我想在calculated.xml中顯示文本，這是在main.class中創建的字符串，並且我希望該字符串成為文本字段中填充的文本，稱為“ editText1”

Answer 1

import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.EditText;


public class MainActivity extends Activity {

Button button1;
String text;

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

public void addListenerOnButton() {

    button1 = (Button) findViewById(R.id.buttoncalculate);
    button1.setOnClickListener(new View.OnClickListener() {

    public void onClick(View view) {

        EditText editText = (EditText)findViewById(R.id.editText1);
        String text = editText.getText().toString();

             Intent myIntent = new Intent(view.getContext(),Calculated.class);
             myIntent.putExtra("mytext",text);
             startActivity(myIntent);

        }
    });
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
  }
}

計算.java

public class Calculated extends Activity {

TextView mTextview;

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

       mTextview = (TextView)findViewById(R.id.textView1);

       mTextview.setText(getIntent().getStringExtra("mytext"));
}

計算.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="42dp"
    android:textAppearance="?android:attr/textAppearanceLarge" />

</RelativeLayout>

Answer 2

將數據從一個活動發送到另一活動

MainActivity.java是您要將數據發送到另一個活動的第一個活動。

Intent myIntent = new Intent(view.getContext(), Calculated.class);
myIntent.putExtra("text", text);
startActivity(myIntent);

Calculated.java是第二個活動，無論您從MainActivity.java傳遞什么，它都會接收意圖數據

String text = myIntent.getStringExtra("text");
TextView textView = (TextView)findViewById(R.id.textView1);
textView.setText(text);