Question

穴居。和Cavebabes。我正在尝试编写一个简单的应用程序来拨打已保存的号码。下面是代码，XML和清单文件。代码编译但是当我尝试在我的手机上运行它，运行Marshmallow时，UI显示正常，但是当我按下按钮时没有任何反应。我究竟做错了什么？万分感谢

pos <- c(4,5,5,6,4,6,4,5.5,6,8,7)
neg <- c(-8,-7,-7,-7,-6,-7,-5,-6,-6.5,-9,-7)
net <- pos+neg

plot.par <- par(mfrow=c(1,1))
par(mar=c(4,4.5,2,1))
plot(pos, type="n", main="", cex.main=1.1, xlab="", 
     ylab="", cex.lab=1.3, yaxt= "n", xaxt="n", ylim=c(-10, 10))
abline(h=c(-10,-8,-6,-4,-2,0,2,4,6,8,10),col = grey(0.6), lty=3)
abline(v=c(1,4,7), 
       col = grey(0.6), lty=3)
par(new=T)
barplot(pos, main="", cex.main=1.1, xlab="", col="darkolivegreen", border="darkolivegreen",
        ylab="", cex.lab=1.1, yaxt= "n", xaxt="n", ylim=c(-10, 10))
par(new=T)
barplot(neg, main="", cex.main=1.1, xlab="", col="darkgoldenrod3",border="darkgoldenrod3",
        ylab="", cex.lab=1.1, yaxt= "n", xaxt="n", ylim=c(-10, 10))
par(new=T)
lines(net, col="firebrick4", lwd = 4)

XML ---------------------------------------------- ------

package com.example.malcolmshingirai.mycall;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;


public class MainActivity extends AppCompatActivity {
    private Button mCall;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mCall = (Button) findViewById(R.id.button2);
    mCall.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            Intent callIntent = new Intent(Intent.ACTION_CALL, Uri.parse("tel: 0123456789"));
            if (ActivityCompat.checkSelfPermission(MainActivity.this,            Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
                return;
            }
            startActivity(callIntent);
        }
    });
    }
}

清单权限--------------------------------------

    <?xml version="1.0" encoding="utf-8"?>
    <android.support.constraint.ConstraintLayout    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.malcolmshingirai.mycall.MainActivity">

    <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/app_name"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:id="@+id/textView"
    app:layout_constraintVertical_bias="0.502" />

    <Button
    android:id="@+id/button2"
    android:layout_width="368dp"
    android:layout_height="wrap_content"
    android:text="@string/call_button"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="parent"
    android:layout_marginTop="8dp"
    android:layout_marginStart="8dp"
    app:layout_constraintTop_toBottomOf="@+id/textView" />

    </android.support.constraint.ConstraintLayout>

再次，一千谢谢。

使用按钮点击在android中进行调用。按钮点击没有响应

0 个答案: