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how to fix my intent when i put the parameters

i get some problem when i use the intent, he said "cannot resolve constructor Intent('....')" , i dont know what is wrong in my code but you can see what i m importing here
package com.example.noen.myintentapp;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn = findViewById(R.id.btn_move);
btn.setOnClickListener(this);
}
#Override
public void onClick(View v) {
switch (v.getId())
{
case R.id.btn_move:
Intent intn = new Intent(MainActivity.this,target1.class);
break;
}
}
}

Canvas not drawing text?

I want to display some text on Screen when the user clicks a button with canvas in android studio. I have been looking at many posts and videos of how to do that. The problem, when I tried their code, when I clicked my button, nothing showed up. Anyone know what I am doing wrong?
Here is my Java class:
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button drawCanvas = findViewById(R.id.draw_canvas_button);
drawCanvas.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Paint paint = new Paint();
Canvas canvas = new Canvas();
paint.setColor(Color.BLACK);
paint.setStyle(Paint.Style.FILL);
paint.setTextSize(20f);
canvas.drawText("My Text", 10f, 15f, paint);
}
});
}
}

It seems that you have to use a method called onDraw by importing View.
import android.view.View;
public class myClass extends View{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
protected void onDraw(Canvas canvas){
super.onDraw(canvas);
//Where you put the code
}

Can't solve add(android.support.v4.app.Fragment) in List can not be applied to (make.application.Fragment)

My Fragment.java
package make.appaplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
public class Fragment41 extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_41);
TextView textViewDisplayResult = (TextView) findViewById(R.id.text_view_display_result);
textViewDisplayResult.setText(getIntent().getBooleanExtra("KEY_ANSWER", false)?R.string.Good_answer:R.string.Wrong_answer);
}
}
And in MainActivity
fragmentList.add(new Fragment41());
throws add(android.support.v4.app.Fragment) in List can not be applied to (make.application.Fragment)
I added compile 'com.android.support:support-v4:25.1.1' and rebuilt but nothing has changed.
Updated code for Lalit user. (I get now three methods Can not resolve and underlined protected)
package make.appaplication;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.widget.TextView;
public class Fragment41 extends android.support.v4.app.Fragment{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_41);
TextView textViewDisplayResult = (TextView) findViewById(R.id.text_view_display_result);
textViewDisplayResult.setText(getIntent().getBooleanExtra("KEY_ANSWER", false)?R.string.Good_answer:R.string.Wrong_answer);
}
}

Replace the code in
public class MyFragment extends Fragment{
}
with
public class MyFragment extends android.support.v4.app.Fragment{
}
and also change import
import android.app.Fragment;
to
import android.support.v4.app.Fragment;

Class or interface expected at the end of the first set of closing brackets

Keep getting a class or interface expected error at the end of the first set of closing brackets, I have a feeling it has to do with the onCreate method, but I'm not sure how to go about fixing it.
package shake.shake;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import android.content.Intent;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainPage extends AppCompatActivity {
private static Button ShakeButton1;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_page);
OnClickButtonListener();
}
}
public void OnClickButtonListener()
{
ShakeButton1 = (Button)findViewById(R.id.ShakeButton);
ShakeButton1.setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intentSecondActivity = new
Intent(MainPage.this, ShakePage.class);
startActivity(intentSecondActivity);
}
}
);
}}

you have extra braces here
public class MainPage extends AppCompatActivity {
private static Button ShakeButton1;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_page);
OnClickButtonListener();
}
} <-------- extra brace.

It's better having a look at codes before posting.
Your method public void OnClickButtonListener() is outside the class MainPage. Move that method inside your class.

Android: Constantly updating TextView with a new value

I need some suggestions as to how I can update a Textview located in the XML with a value generated through my code.
The program draws a straight line through the canvas, I want the textView to reflect the line's tip x-value.
My code as follows:
package com.example.threadexperiment1;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.view.View;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class MainActivity extends Activity {
lineDrawing InfiniteLine;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
InfiniteLine = new lineDrawing (this);
setContentView(R.layout.activity_main);
Thread thread = new Thread(InfiniteLine);
thread.start();
RelativeLayout RL1 = (RelativeLayout)findViewById(R.id.RelativeLayout1);
RL1.addView(InfiniteLine);
}
public class lineDrawing extends View implements Runnable {
float x=100, y=100;
Paint lineColour = new Paint ();
TextView TV1 = (TextView)findViewById(R.id.textView1);
//Constructor
public lineDrawing(Context context) {
super(context);
lineColour.setColor(Color.BLACK);
}
//ondraw codes
#Override
public void onDraw (Canvas canvas){
canvas.drawLine(0,0,x,y,lineColour);
if (x==500){
x=0;
y=0;
}
invalidate();
}
#Override
public void run() {
while (!Thread.currentThread().isInterrupted()) {
try {
Thread.sleep(250);
}
catch (Exception e) {}
x+=10;
y+=10;
}
}
}
}

Try textView.setText(string) within the thread.