Java Android将值传递给另一个活动
我有一个带有30个按钮的Java Android将值传递给另一个活动,java,android,android-activity,Java,Android,Android Activity,我有一个带有30个按钮的main活动(ID:imageButton1,imageButton2)。在click事件中,我开始一个名为KlikNaDugme的新活动: main活动 protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_home); buttons = new Imag
main活动
(ID:imageButton1
,imageButton2
)。在click事件中,我开始一个名为KlikNaDugme
的新活动:
main活动
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
buttons = new ImageButton[30];
for (int i = 0; i < buttons.length; i++) {
buttons[i] = (ImageButton) findViewById(R.id.imageButton + i);
vr = i;
buttons[i].setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
Intent myIntent = new Intent(HomeActivity.this, KlikNaDugme.class).putExtra("vrijednost", vr);
startActivity(myIntent);
}
});
}
}
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_klik_na_dugme);
int x = getIntent().getExtras().getInt("vrijednost");
System.out.println(x);
}
问题是它总是得到29的值。如何正确传递id?将
I
的值存储在按钮的标签中: buttons = new ImageButton[30];
for(int i=0; i<buttons.length; i++) {
{
buttons[i] = (ImageButton) findViewById(getResources().getIdentifier("imageButton" + (i + 1), "id", this.getPackageName()));
buttons[i].setTag(i);
buttons[i].setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent myIntent = new Intent(HomeActivity.this, KlikNaDugme.class)
myIntent.putExtra("vrijednost", Integer.parseInt(view.getTag().toString()));
startActivity(myIntent);
}
});
}
}
buttons=新建图像按钮[30];
对于(int i=0;i将i
的值存储在按钮的标签中:
buttons = new ImageButton[30];
for(int i=0; i<buttons.length; i++) {
{
buttons[i] = (ImageButton) findViewById(getResources().getIdentifier("imageButton" + (i + 1), "id", this.getPackageName()));
buttons[i].setTag(i);
buttons[i].setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent myIntent = new Intent(HomeActivity.this, KlikNaDugme.class)
myIntent.putExtra("vrijednost", Integer.parseInt(view.getTag().toString()));
startActivity(myIntent);
}
});
}
}
buttons=新建图像按钮[30];
对于(int i=0;i将vr值作为标记添加到按钮,然后使用getTag()方法在onclicklistener中获取vr值
for(int i=0; i<buttons.length; i++) {
{
buttons[i] = (ImageButton) findViewById(R.id.imageButton + i);
vr = i;
buttons[i].setTag(vr); // This will se the vr value as tag
buttons[i].setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
int vr = (int)view.getTag() // this will get the vr value from view
Intent myIntent = new Intent(HomeActivity.this,
KlikNaDugme.class).putExtra("vrijednost", vr);
startActivity(myIntent);
}
});
}
for(int i=0;i将vr值作为标记添加到按钮,然后使用getTag()方法在onclicklistener中获取vr值
for(int i=0; i<buttons.length; i++) {
{
buttons[i] = (ImageButton) findViewById(R.id.imageButton + i);
vr = i;
buttons[i].setTag(vr); // This will se the vr value as tag
buttons[i].setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
int vr = (int)view.getTag() // this will get the vr value from view
Intent myIntent = new Intent(HomeActivity.this,
KlikNaDugme.class).putExtra("vrijednost", vr);
startActivity(myIntent);
}
});
}
for(int i=0;i问题在于:
buttons[i] = (ImageButton) findViewById(R.id.imageButton + i);
您所做的是创建一个无效的资源引用,然后在该引用上找到您的视图,这显然是错误的。请记住findViewById()
需要一个由Android Studio本身生成的资源id
解决方案是将所有20-30个视图引用保存在一个数组中,然后使用循环在它们上设置单击侦听器问题在于:
buttons[i] = (ImageButton) findViewById(R.id.imageButton + i);
您所做的是创建一个无效的资源引用,然后在该引用上找到您的视图,这显然是错误的。请记住findViewById()
需要一个由Android Studio本身生成的资源id
解决方案是将所有20-30个视图引用保存在一个数组中,然后使用循环设置它们上的单击侦听器R.id。什么会给你一个由android studio在R类中生成的整数值,而不是what\u ever字符串。你应该使用getResources().getIdentifier()
获取正确的资源id并将其传递给findViewById()
请尝试此代码。它将为您获取图像按钮的正确id:
buttons = new ImageButton[30];
for(int i=0; i<buttons.length; i++) {
{
String buttonID = "imageButton" + (i+1);
int resID = getResources().getIdentifier(buttonID, "id", getPackageName());
buttons[i] = (ImageButton) findViewById(resID);
buttons[i].setTag(i);
//vr = i;
buttons[i].setOnClickListener(new View.OnClickListener() {
public void onClick(View args0) {
Intent myIntent = new Intent(HomeActivity.this,
KlikNaDugme.class).putExtra("vrijednost", (int)args0.getTag());
startActivity(myIntent);
}
});
}
buttons=新建图像按钮[30];
对于(int i=0;iR.id.what\u ever将为您提供由android studio在R类中生成的整数值,而不是what\u ever字符串。您应该使用getResources().getIdentifier()
获取正确的资源id,并将其传递给findViewById()
请尝试此代码。它将为您获取图像按钮的正确id:
buttons = new ImageButton[30];
for(int i=0; i<buttons.length; i++) {
{
String buttonID = "imageButton" + (i+1);
int resID = getResources().getIdentifier(buttonID, "id", getPackageName());
buttons[i] = (ImageButton) findViewById(resID);
buttons[i].setTag(i);
//vr = i;
buttons[i].setOnClickListener(new View.OnClickListener() {
public void onClick(View args0) {
Intent myIntent = new Intent(HomeActivity.this,
KlikNaDugme.class).putExtra("vrijednost", (int)args0.getTag());
startActivity(myIntent);
}
});
}
buttons=新建图像按钮[30];
对于(int i=0;我猜您的findViewById(R.id.imageButton+i)不正确。请看一下:按钮的名称是什么?@Mohammaddrezakhahani您是对的,有一个问题。mTak您是指id吗?在格式“@+id/imageButton1”,“@+id/imageButton2”中从1到30....@markelof查看我编辑的答案,在这里我修复了ids问题。查看编辑的答案。当用户单击ImageButtons时,vr的值为29,因为它是您最后分配给它的值。因此,您单击的任何ImageButton都将获得该值。我猜您的findViewById(R.id.ImageButton+I)不正确。请看一下:按钮的名称是什么?@Mohammaddrezakhahani您是对的,有一个问题。mTak您是指id吗?它从1到30,格式为“@+id/imageButton1”,“@+id/imageButton2”....@markelof查看我编辑的答案,在这里我解决了ids问题。查看编辑的答案。当用户单击ImageButtons时,vr的值为29,因为它是您最后分配给它的值。因此,您单击的任何ImageButton都将获得该值。nice and clean。nice and clean。