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我在兩項活動之間發送數據時遇到問題 - 我是編程新手，認爲它與代碼的定位有關，但我不確定，可能更多簡單一些。在兩項活動之間發送數據Android Studio
我試圖將stepCount中的數字發送到第二個活動，它存儲在myText3中，並且在第一個活動中可見，並且計數正確（它的原始數據但現在完成此工作）。
如果我的值設置爲myText3它會顯示在第二個活動是價值，但它不會顯示的stepCount當其在myText3
在此先感謝..
第一個活動
值import android.content.Intent;
import android.os.CountDownTimer;
import android.support.v7.app.AppCompatActivity;
import android.view.View.OnClickListener;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
//import android.support.design.widget.FloatingActionButton;
//import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements SensorEventListener {
TextView tvx, tvy, tvz, display, display2, display3;
float total;
float stepCount;
float x, y, z;
float xPrev,yPrev, zPrev;
float totalPrev = 0;
Button saveButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//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) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});*/
tvx = (TextView) findViewById(R.id.textView);
tvy = (TextView) findViewById(R.id.textView2);
tvz = (TextView) findViewById(R.id.textView3);
display = (TextView) findViewById(R.id.display);
display2 = (TextView) findViewById(R.id.display2);
display3 = (TextView) findViewById(R.id.display3);
saveButton = (Button) findViewById(R.id.saveButton);
SensorManager mgr = (SensorManager) getSystemService(SENSOR_SERVICE);
Sensor GSensor = mgr.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
mgr.registerListener(this, GSensor, SensorManager.SENSOR_DELAY_NORMAL);
}
@Override
public void onSensorChanged(SensorEvent event) {
// called byt the system every 10 ms
x = event.values[0];
y = event.values[1];
z = event.values[2];
total = x + y + z;
new CountDownTimer(3000, 1000) {
public void onFinish() {
// When timer is finished
// Execute your code here
xPrev = x;
yPrev = y;
zPrev = z;
totalPrev = xPrev + yPrev + zPrev;
}
public void onTick(long millisUntilFinished) {
// millisUntilFinished The amount of time until finished.
}
}.start();
if (Math.abs(total - totalPrev) > 20) {
stepCount++;
}
tvx.setText(String.valueOf(event.values[0]));
tvy.setText(String.valueOf(event.values[1]));
tvz.setText(String.valueOf(event.values[2]));
String mytext = Float.toString(total);
display.setText(mytext);
String mytext2 = Float.toString(totalPrev);
display2.setText(mytext2);
String mytext3 = Float.toString(stepCount);
display3.setText(mytext3);
saveButton.setOnClickListener(new View.OnClickListener() {
String mytext3;
@Override
public void onClick(View v) {
Intent A2Intent = new Intent (v.getContext(), Main2Activity.class);
//EditText et = (EditText) findViewById(R.id.editText);
// pass the entered phone number to the next activity
//A2Intent.putExtra("phoneNumber", tv2.getText());
//String ph = et.getText().toString();
A2Intent.putExtra("steps", mytext3);
// start the next activity/page
startActivity(A2Intent);
}
});
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
/*@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}*/
/*saveButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent A2Intent = new Intent (v.getContext(), Main2Activity.class);
EditText et = (EditText) findViewById(R.id.editText);
// pass the entered phone number to the next activity
//A2Intent.putExtra("phoneNumber", tv2.getText());
String ph = et.getText().toString();
A2Intent.putExtra("phoneNumber", ph);
// start the next activity/page
startActivity(A2Intent);
}
})*/
}
次活動
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class Main2Activity extends AppCompatActivity {
TextView textView1;
Button newButton;
String displayCount;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
textView1 = (TextView) findViewById(R.id.editText);
newButton = (Button) findViewById(R.id.button);
displayCount = getIntent().getStringExtra("steps");
textView1.setText(displayCount);
}
}
在開始第二個活動之前做一個日誌，以查看stepCount和mtText3的值 –