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Android 自动拨打电话功能可以通过以下步骤实现：
1. 在 AndroidManifest.xml 文件中添加拨打电话的权限：
```
<uses-permission android:name="android.permission.CALL_PHONE" />
```
n2. 在代码中使用 Intent 启动拨打电话的界面：
```
String phoneNumber = "10086";
Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + phoneNumber));
startActivity(intent);
```
注意：使用 ACTION_CALL 需要在 AndroidManifest.xml 文件中添加以下权限：
```
<uses-permission android:name="android.permission.CALL_PHONE" />
```
如果不想直接拨打电话，而是想跳转到拨号界面，可以使用 ACTION_DIAL：
```
String phoneNumber = "10086";
Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse("tel:" + phoneNumber));
startActivity(intent);
```
这样就可以实现 Android 自动拨打电话功能了。
完整代码：
public class MainActivity extends AppCompatActivity {
private EditText etPhone;
private TextView tvTime;
private final static String simSlotName[] = {
"extra_asus_dial_use_dualsim",
"com.android.phone.extra.slot",//基本上是这个
"slot",
"simslot",
"sim_slot",
"subscription",//华为是这个
"Subscription",
"phone",
"com.android.phone.DialingMode",
"simSlot",
"slot_id",//小米是这个
"simId",
"simnum",
"phone_type",
"slotId",
"slotIdx"
};
private Handler mHandler = new Handler();
private Runnable runnable;
private int time = 5;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
etPhone = findViewById(R.id.et_phone);
tvTime = findViewById(R.id.tv_time);
TextView tvCall1 = findViewById(R.id.tv_call1);
TextView tvCall2 = findViewById(R.id.tv_call2);
TextView tvHangUp = findViewById(R.id.tv_hang_up);
if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
//未授权
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CALL_PHONE}, 1);
} else {
//已授权
}
TelephonyManager tpm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
tpm.listen(new MyPhontStateListener(), PhoneStateListener.LISTEN_CALL_STATE);
runnable = new Runnable() {
@Override
public void run() {
time--;
if (time == 0) {
time = 5;
String phone = etPhone.getText().toString();
try {
/**
* Intent.ACTION_CALL 直接拨打电话
* Intent.ACTION_DIAL 跳转到拨号盘
*/
Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + phone));
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
for (int i = 0; i < simSlotName.length; i++) {
intent.putExtra(simSlotName[i], 0);
}
startActivity(intent);
Log.e("错误信息：", "跳转");
} catch (Exception e) {
Log.e("错误信息：", e.getMessage());
}
} else {
tvTime.setText(time + "");
mHandler.postDelayed(this, 1000);
}
}
};
tvCall1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
time = 5;
tvTime.setText("5");
mHandler.postDelayed(runnable, 500);
}
});
tvCall2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String phone = etPhone.getText().toString();
try {
/**
* Intent.ACTION_CALL 直接拨打电话
* Intent.ACTION_DIAL 跳转到拨号盘
*/
Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + phone));
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
for (int i = 0; i < simSlotName.length; i++) {
intent.putExtra(simSlotName[i], 1);
}
startActivity(intent);
} catch (Exception e) {
Log.e("错误信息：", e.getMessage());
}
}
});
tvHangUp.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
}
@Override
protected void onRestart() {
super.onRestart();
time = 5;
tvTime.setText("5");
mHandler.postDelayed(runnable, 500);
}
@Override
protected void onDestroy() {
mHandler.removeCallbacks(runnable);
mHandler = null;
super.onDestroy();
}
class MyPhontStateListener extends PhoneStateListener {
@Override
public void onCallStateChanged(int state, String phoneNumber) {
Log.e("电话状态：", "------------");
switch (state) {
case TelephonyManager.CALL_STATE_IDLE://空闲
Log.e("电话状态：", "空闲");
break;
case TelephonyManager.CALL_STATE_RINGING://来电
Log.e("电话状态：", "来电");
break;
case TelephonyManager.CALL_STATE_OFFHOOK://正在通话中
Log.e("电话状态：", "正在通话中");
break;
}
}
}
}