java 使用 onClickListener (Intent) 时出错
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Error using onClickListener (Intent)
提问by Skizo-oz??S
Well, I'm trying to create an intent on a "login.java" the code is :
好吧，我试图在“login.java”上创建一个意图，代码是：
Button btEntrar = (Button) findViewById(R.id.btnSingIn);
btEntrar.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i;
i = new Intent(this, MainActivity.class);
startActivity(i);
}
});
But it says that I can't go to the other activity saying this :
但它说我不能去其他活动说这个：
Error:(24, 21) error: no suitable constructor found for Intent(,Class) constructor Intent.Intent(String,Uri) is not applicable (argument mismatch; cannot be converted to String) constructor Intent.Intent(Context,Class) is not applicable (argument mismatch; cannot be converted to Context)
错误：(24, 21) 错误：没有找到合适的构造函数 Intent(,Class) 构造函数 Intent.Intent(String,Uri) 不适用（参数不匹配；无法转换为字符串）构造函数 Intent.Intent(Context,Class)不适用（参数不匹配；无法转换为上下文）
and...
和...
Error:Execution failed for task ':app:compileDebugJava'. Compilation failed; see the compiler error output for details.
错误：任务 ':app:compileDebugJava' 的执行失败。编译失败；有关详细信息，请参阅编译器错误输出。
回答by Sufiyan Ghori
Just a few lines to explain the reason why thisdoes not work in:
只需几行就可以解释为什么this不起作用的原因：
i = new Intent(this, MainActivity.class)
The intent is created inside another class, here an anonymous inner class OnClickListener. Thus thisdoes not refer the instance of your Activity (or Context) as intended but the instance of your anonymous inner class OnClickListener.
意图是在另一个类中创建的，这里是一个匿名内部类OnClickListener。因此this，不会按预期引用您的 Activity（或上下文）的实例，而是引用您的匿名内部类的实例OnClickListener。
So you should provide the correct context of your class.
所以你应该提供你班级的正确上下文。
i = new Intent(YourClassName.this, MainActivity.class)
回答by Abhishek Chaubey
use
if you want to send it from login.javato mainactivity.classuse
如果你想从发送用它login.java来mainactivity.class使用
Intent intent=new Intent(login.this,Mainactivity.class);
startActivity(intent);
回答by Naveen Tamrakar
updated code in to your activity
将代码更新到您的活动中
Button btEntrar = (Button) findViewById(R.id.btnSingIn);
btEntrar.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i;
i = new Intent(login.this, MainActivity.class);
startActivity(i);
}
});
回答by Umair
try using
尝试使用
Intent i = new Intent(login.this, mainActivity.class);
hope this helps
希望这可以帮助
回答by previousdeveloper
Did you add manifest.xml or try this code ?Intent i = new Intent(login.this,mainActivity.class);
您是否添加了 manifest.xml 或尝试使用此代码？Intent i = new Intent(login.this,mainActivity.class);
