Android-将文本设置为 TextView

我目前正在学习一些学校项目的机器人，我不能指出的方式，以 动态设置文本到 TextView。

这是我的代码:

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_enviar_mensaje);
err = (TextView)findViewById(R.id.texto);
err.setText("Escriba su mensaje y luego seleccione el canal.");
}

现在没用，我也找不到办法。

任何帮助都会很感激..。 谢谢你抽出时间, 何塞。

编辑: 这是 Activity _ enviar _ mensaje. 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="wrap_content"
...
tools:context=".EnviarMensaje" >
...
<TextView
android:id="@+id/texto"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/listaVista"
android:layout_alignParentBottom="true"
android:layout_alignRight="@+id/listaVista"
android:text="TextView" />
...
</RelativeLayout>

不工作，我的意思是文本显示不改变在任何时候..。

584556 次浏览
小开

Well, @+id/listaVista ListView is drawn after @+id/texto and on top of it. So change in ListView from:

android:layout_below="@+id/editText1"

to:

android:layout_above="@+id/texto"

Also, since the list is drawn after textview, I find it dangerous to have android:layout_alignRight="@+id/listaVista" in TextView. So remove it and find another way of aligning.

EDIT Taking a second look at your layout I think this is what you really want to have:

<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="wrap_content"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".EnviarMensaje" >


<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:text="Escriba el mensaje y luego clickee el canal a ser enviado"
android:textSize="20sp" />


<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView1"
android:layout_alignRight="@+id/textView1"
android:layout_below="@+id/textView1"
android:ems="10"
android:inputType="text" />


<TextView
android:id="@+id/texto"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/listaVista"
android:layout_alignParentBottom="true"
android:text="TextView" />


<ListView
android:id="@+id/listaVista"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/texto"
android:layout_alignParentLeft="true"
android:layout_below="@+id/editText1" >
</ListView>


</RelativeLayout>
小开
最佳答案

In your layout XML:

<TextView
android:id="@+id/myAwesomeTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:text="Escriba el mensaje y luego clickee el canal a ser enviado"
android:textSize="20sp" />

Then, in your activity class:

// globally
TextView myAwesomeTextView = (TextView)findViewById(R.id.myAwesomeTextView);


//in your OnCreate() method
myAwesomeTextView.setText("My Awesome Text");
小开

I had a similar problem. It turns out I had two TextView objects with the same ID. They were in different view files and so Eclipse did not give me an error. Try to rename your id in the TextView and see if that does not fix your problem.

小开

Why don´t you try to assign the textview contents onStart() rather than onCreate()

小开

in your activity_main.xml paste this code:

            <TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="19dp"
android:layout_marginTop="43dp"
android:text="@string/name" />

and go to res folder->values->strings.xml paste the below code with the code that already exists:

          <string name="name">Escriba su mensaje y luego seleccione el canal.</string>

the above code means that you have created a textview with id:name(android:id="@+id/name") and assigned that textview to a string with an identifier name(android:text="@string/name") in strings.xml your using that identifier name to assign the text,

小开

This should do the trick:

TextView.setText("test");
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In your layout. Your Texto should not contain (android:text=...). I would remove this line. Either keep the Java string OR the (android:text=...)

小开

Please correct the following line:

err = (TextView)findViewById(R.id.texto);

to:

err = (TextView)findViewById(R.id.err);
小开

Try This:

TextView err = (TextView)findViewById(R.id.text);

Ensure you import TextView.

小开

As you have given static text

err.setText("Escriba su mensaje y luego seleccione el canal.");

It will not change , it will remain same.

Example for Dynamic Text for textview is :

MainActivity.java
package com.example.dynamictextview;


import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;


public class MainActivity extends Activity {


int count = 0;
Button clickMeBtn;
TextView dynamicText;


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


clickMeBtn = (Button) findViewById(R.id.button_click);
dynamicText = (TextView) findViewById(R.id.textview);


clickMeBtn.setOnClickListener(new OnClickListener() {


@Override
public void onClick(View v) {


count++;
dynamicText.setText("dynamic text example : " + count);


}
});


}


}


For activity_main.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="com.example.dynamictextview.MainActivity" >


<Button
android:id="@+id/button_click"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="click me"
android:layout_centerInParent="true" />


<TextView
android:id="@+id/textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world"
android:layout_below="@id/button_click"
android:layout_centerHorizontal="true"
android:textSize="25sp"
android:layout_marginTop="20dp"
/>


</RelativeLayout>
小开

PUT THIS CODE IN YOUR XML FILE

<TextView
android:id="@+id/textview1"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>

PUT THIS CODE IN YOUR JAVA FILE

// Declaring components like TextView globally is a good habit

TextView mTextView = (TextView) findViewById(R.id.textview1);

// Put this in OnCreate

mTextView.setText("Welcome to Dynamic TextView");
小开

In XML file,

<TextView
android:id="@+id/textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="My Name"
android:textColor="#cccccc"/>

在Java活动文件中，

public class MainActivity1 extends Activity
{
TextView t1;
public void onCreate(Bundle onSavedInstance)
{
setContentView(R.layout.xmlfilename);
t1 = (TextView)findViewbyId(R.id.textview);
}
}
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first your should create an object for text view TextView show_alter 

show_alert = (TextView)findViewById(R.id.show_alert);
show_alert.setText("My Awesome Text");
小开

You should use ButterKnife Library http://jakewharton.github.io/butterknife/

And use it like

@InjectView(R.id.texto)
TextView err;

in onCreate method

ButterKnife.inject(this)
err.setText("Escriba su mensaje y luego seleccione el canal.");
小开

In layout file.

<TextView
android:id="@+id/myTextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Some Text"
android:textSize="18sp"
android:textColor="#000000"/>

In Activity

TextView myTextView = (TextView)findViewById(R.id.myTextView);
myTextView.setText("Hello World!");
小开

Go to your activityMain and set the text by adding a widget from the widgets section and manually changing text by selecting and typing.

小开

In xml use this:

<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>

In Activity define the view:

Textview textView=(TextView)findViewById(R.id.textView);
textView.setText(getResources().getString(R.string.txt_hello));

In string file:

<string name="txt_hello">Hello</string>

Output: Hello

小开

You can set string in textview programatically like below.

TextView textView = (TextView)findViewById(R.id.texto);
err.setText("Escriba su mensaje y luego seleccione el canal.");

or 

TextView textView = (TextView)findViewById(R.id.texto);
err.setText(getActivity().getResource().getString(R.string.seleccione_canal));

You can set string in xml like below.

<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="19dp"
android:layout_marginTop="43dp"
android:text="Escriba su mensaje y luego seleccione el canal." />

or

<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="19dp"
android:layout_marginTop="43dp"
android:text="@string/seleccione_canal" />
小开

Your code is ok, you are loading the .xml that contains the TextView using setContentView(): 

   setContentView(R.layout.activity_enviar_mensaje);

and then getting the reference of the TextView inside activity_enviar_mensaje.xml, and setting a text: 

err = (TextView)findViewById(R.id.texto);
err.setText("Escriba su mensaje y luego seleccione el canal.");

The problem is that your TextView is hidden by the ListView:

enter image description here

小开 
final TextView err = (TextView)findViewById(R.id.texto);
err.setText("Escriba su mensaje y luego seleccione el canal.");

you can find every thing you need about textview here

小开

I know its 2 months but yeah

replace your code

Private TextView err;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_enviar_mensaje);
err = (TextView)findViewById(R.id.texto);
err.setText("Escriba su mensaje y luego seleccione el canal.");
}
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Kotlin Solution

To set using a String, just use this

view.text = "My string"

To do the same with a resource value, add this extension property to much more easily set your text

view.textRes = R.string.my_string


var TextView.textRes
get() = 0 // HACK: property requires getter
set(@StringRes textRes) {
text = resources.getText(textRes)
}
小开

Maybe you have assigned the text in onResume() function


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