我有2个类BlockIdActivity.java和ScanWifi.java。我在BlockIdActivity.java文件中有2个按钮,并且我能够在那里看到我的烤面包。但是我不能看到我在ScanWifi.Java类中定义的按钮的敬酒。吐司消息不工作android
以下为BlockIdActivity.java
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.text.TextUtils;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;
public class BlockIdActivity extends ActionBarActivity {
private ImageButton mUpButton;
private ImageButton mDownButton;
private TextView mBlock_Id_Field;
int counter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_block_id);
mUpButton = (ImageButton)findViewById(R.id.arrow_up);
mDownButton = (ImageButton)findViewById(R.id.arrow_down);
mBlock_Id_Field = (TextView)findViewById(R.id.BlockIdField);
mUpButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mBlock_Id_Field.getText().toString().trim().equals(""))
{
counter = 1;
mBlock_Id_Field.setText(String.valueOf(counter));
}
else {
counter = Integer.valueOf(mBlock_Id_Field.getText().toString().trim());
counter++;
mBlock_Id_Field.setText(String.valueOf(counter));
}
}
});
mDownButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int counter = Integer.valueOf(mBlock_Id_Field.getText().toString().trim());
// boolean emptyfield = mBlock_Id_Field.getText().toString().equals("");
if(counter <=1){
Toast.makeText(BlockIdActivity.this,
R.string.negative_blockid_toast,
Toast.LENGTH_SHORT).show();
counter = 1;
mBlock_Id_Field.setText(String.valueOf(counter));
}else {
counter--;
mBlock_Id_Field.setText(String.valueOf(counter));
}
}
});
}
}
和代码ScanWifi.java
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class ScanWifi extends ActionBarActivity {
private Button mScanWifiButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_block_id);
mScanWifiButton = (Button)findViewById(R.id.ScanWifiButton);
mScanWifiButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getBaseContext(),
R.string.ScanWifi_toast,
Toast.LENGTH_SHORT).show();
}
});
}
}
代码这是strings.xml档案:
<resources>
<string name="app_name">SnifferTrain</string>
<string name="BlockId">BlockId</string>
<string name="ScanWifi">ScanWifi</string>
<string name="ScanWifi_toast">ScanWifi Button Pressed</string>
<string name="negative_blockid_toast">Block Id Field Cannot Be Less Than 1 or Empty.Setting BlockID To 1</string>
<string name="action_settings">Settings</string>
</resources>
有人可以p租约解释为什么当我按下ScanWifi按钮时ScanWifi_toast不显示。我已经尝试将敬酒的上下文更改为ScanWifi.this或getApplicationContext(),但它似乎不起作用。我没有收到任何编译错误。请帮助
变化'R.string.ScanWifi_toast'到'的getResource()的getString(R.string.ScanWifi_toast)' – 2014-11-06 06:35:58
总是试图以小写定义名称String.xml更详细的检查,而不是大写:HTTP:/ /developer.android.com/guide/topics/resources/string-resource.html#FormattingAndStyling – 2014-11-06 06:41:41
尽管到目前为止所有的答案,有一个Toast.makeText()接受字符串资源ID的重载,它的工作原理是正确的。问题在别的地方。考虑在代码中添加日志记录或调试器断点以确认它已运行,如果没有,请找出为什么它不运行。 – laalto 2014-11-06 06:42:43