如何使用 OnClick 方法附加文本 [英] How to append text with OnClick method
问题描述
我想创建一个字符串,一旦按下 ImageView 就会附加其组件.
I would like to create a string whose components are appended once an ImageView is pressed.
我有一个名为 imageView 的 ImageView 并在单击时命名为 ImageView,我将一个值附加到字符串中.最后,当单击一个按钮时,我希望字符串显示为在最后一个覆盖中调用的 Toast.因此,我已经定义了字符串(命名结果)、按钮和图像,但我仍然遇到很多错误,最明显的是我在附加字符串时无法回忆value1".
I have an ImageView called imageView and named ImageView on clicking which I am appending a value to a string. Finally when clicking on one button, I would like the string to show up with a Toast called out in the last Override. I have, therefore, defined the string (named result), the button and the image, but I still get many errors, most notably I can't recall the "value1" when appending the String.
有什么想法吗?
Button button;
Button Click = (Button) findViewById(R.id.button);
String result;
ImageView Imageview = (ImageView) findViewById(R.id.imageView);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
(...)
public class Program {
public void main(String[] args) {
final int value1 = 300;
double value2 = 3.14;
short value3 = 5;
char value4 = 'A';
// Create StringBuilder and add four values to it.
final StringBuilder builder = new StringBuilder();
builder.append(value2).append("\n");
builder.append(value3).append("\n");
builder.append(value4);
// Display results.
String result = builder.toString();
System.out.println(result);
public void onClick(View v) {
Imageview.setOnClickListener(new View.OnClickListener() {
builder.append(value1).append("\n");
}
}
}
@Override
public void onClick(View V){
Toast.makeText(getApplicationContext(),getApplicationContext().getResources().getString(Integer.parseInt(result)), Toast.LENGTH_LONG).show();
}
推荐答案
你的 Main Activity Java 类有这样的东西
Your Main Activity Java class have somthing like this
public class MainActivity extends AppCompatActivity {
Button button;
Button click;
String result ="";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
click = (Button) findViewById(R.id.button);
final int value1 = 300;
final double value2 = 3.14;
final short value3 = 5;
final char value4 = 'A';
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//create the send intent
Intent shareIntent =
new Intent(android.content.Intent.ACTION_SEND);
//set the type
shareIntent.setType("text/plain");
//add a subject
shareIntent.putExtra(android.content.Intent.EXTRA_SUBJECT,
"Insert Subject Here");
//build the body of the message to be shared
String shareMessage = "Insert message body here.";
//add the message
shareIntent.putExtra(android.content.Intent.EXTRA_TEXT,
shareMessage);
//start the chooser for sharing
startActivity(Intent.createChooser(shareIntent, getResources().getString(R.string.FinalString)));
}
});
// Create StringBuilder and add four values to it.
final StringBuilder builder = new StringBuilder();
builder.append(value2).append("\n");
builder.append(value3).append("\n");
builder.append(value4);
ImageView imageview = (ImageView) findViewById(R.id.imageView);
imageview.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
builder.append(value1).append("\n");
}
});
click.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this,builder.toString(),Toast.LENGTH_LONG).show();
}
});
}
}
我把你的 XMl 文件改成这样更好
i change Your XMl File To This iths better
<?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"
android:orientation="vertical"
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=".MainActivity">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!" />
<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="88dp"
android:clickable="true"
android:src="@android:drawable/ic_input_add" />
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>
我测试一切都很好
并在此处
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